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653 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
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da07894d1d |
Merge tag 'docs-7.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux
Pull more documentation updates from Jonathan Corbet: "A handful of late-arriving docs fixes, along with one document update that fell through the cracks before" * tag 'docs-7.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux: docs: tools: Fix typo 'ackward' to 'awkward' in unittest.rst kdoc: xforms: ignore special static/inline macros kdoc: xforms_lists: handle DECLARE_PER_CPU() in kernel-doc MAINTAINERS: Fix regex for kdoc docs: kgdb: Fix path of driver options Documentation: tracing: fix typo in events documentation Docs/driver-api/uio-howto: document mmap_prepare callback docs/mm: clarify that we are not looking for LLM generated content kernel-doc: xforms: support __SYSFS_FUNCTION_ALTERNATIVE() |
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Yudistira Putra
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8a66c09479 |
Documentation: tracing: fix typo in events documentation
Fix a typo in the tracing events documentation: "can by built up" should be "can be built up". Signed-off-by: Yudistira Putra <pyudistira519@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260622143735.71778-1-pyudistira519@gmail.com> |
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Linus Torvalds
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05d2a3da15 |
Merge tag 'perf-tools-for-v7.2-1-2026-06-22' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools
Pull perf tools updates from Arnaldo Carvalho de Melo: - Introduce 'perf inject --aslr' to remap ASLR-randomized addresses in perf.data files, enabling reproducible analysis across runs with different address space layouts - Refactor evsel out of sample processing paths: store evsel in struct perf_sample and remove the redundant evsel parameter from tool APIs, tracepoint handlers, hist entry iterators, and db-export, simplifying the entire tool callback chain - Switch architecture detection from string-based perf_env__arch() comparisons to the numeric ELF e_machine field across the codebase (capstone, print_insn, c2c, lock-contention, sort, sample-raw, machine, header), making cross-analysis more robust - Overhaul ARM CoreSight ETM tests: add deterministic and named_threads workloads, speed up basic and disassembly tests, add process attribution and concurrent threads tests, remove unused workloads and duplicate tests, queue context packets for the frontend decoder - Add ARM SPE IMPDEF event decoding for Arm Neoverse N1, store MIDR in arm_spe_pkt for per-CPU event mapping, handle missing CPU IDs gracefully - Refactor libunwind support: remove the libunwind-local backend, make register reading cross-platform, add RISC-V libunwind support, allow dynamic selection between libdw and libunwind unwinding at runtime - Extensive hardening of perf.data parsing against crafted files: add bounds checks and byte-swap validation for session records, feature sections, header attributes, BPF metadata, auxtrace errors, compressed events, CPU maps, build ID notes, and ELF program headers. Add minimum event size validation and file offset diagnostics - Fix libdw API contract violations across dwarf-aux, libdw, probe-finder, annotate-data, and debuginfo subsystems. Fix callchain parent update in ORDER_CALLER mode, support DWARF line 0 in inline lists, handle multiple address spaces in callchains - Fix numerous 'perf sched' bugs: thread reference leaks, memory leaks, heap overflows with cross-machine recordings, NULL dereferences, replace BUG_ON assertions with graceful error handling, bounds-check CPU indices, fix SIGCHLD vs pause() races in sched stats - Overhaul the build system: move BPF skeleton generation out of Makefile.perf into bpf_skel.mak, decouple pmu-events from the prepare target, make beauty generated C code standalone .o files, compile BPF skeletons with -mcpu=v3, fix continuous rebuilds, various cleanups - Add 'perf test' JUnit XML reporting with -j/--junit option, split monolithic test suites into sub-tests, add summary reporting, refactor parallel poll loop, fix test failures on musl-based systems - Fix 'perf c2c' memory leaks in hist entry and format list handling, use-after-free in error paths, bounds-check CPU and node IDs - Fix 'perf bpf' metadata leaks on duplicate insert and alloc failure, bounds-check array offsets, validate event sizes and func_info fields, add NULL checks - Fix hwmon PMU: off-by-one null termination on sysfs reads, strlcpy buffer overflow in parse_hwmon_filename(), fd 0 check, empty label reads, scnprintf usage - Fix symbols subsystem: bounds-check ELF and sysfs build ID note iteration, validate p_filesz, fix 32-bit ELF bswap error, fix signed overflow in size checks, bounds-check .gnu_debuglink section - Fix tools lib api: null termination in filename__read_int/ull(), uninitialized stack data in filename__write_int(), snprintf truncation in mount_overload() - Replace libbabeltrace with babeltrace2-ctf-writer for CTF conversion in 'perf data' - Add RISC-V SDT argument parsing for static tracepoints - Add 'perf trace --show-cpu' option to display CPU id - Add 'perf bench sched pipe --write-size' option - Add a perf-specific .clang-format that overrides some kernel style behaviors - Update Intel vendor events for Alder Lake, Arrow Lake, Clearwater Forest, Emerald Rapids, Granite Rapids, Grand Ridge, Lunar Lake, Meteor Lake, Panther Lake, Sapphire Rapids, Sierra Forest - Add IOMMU metrics for AMD and Intel - Fix AMD event: switch l2_itlb_misses to bp_l1_tlb_miss_l2_tlb_miss.all - Add AMD IBS improvements: decode Streaming-store and Remote-Socket flags, suppress bogus fields on Zen4+, skip privilege test on Zen6+ - Fix 'perf lock contention' SIGCHLD vs pause() race, allow 'mmap_lock' in -L filter, enable end-timestamp for cgroup aggregation, fix non-atomic data updates - Fix 'perf stat' false NMI watchdog warning in aggregation modes, bounds-check CPU index in topology callbacks, add aggr_nr metric parser support for uncore scaling - Fix 'perf timechart' memory leaks, CPU bounds checking, use-after-free on corrupted callchains - Fix 'perf inject' itrace branch stack synthesis, fix synthesized sample size with branch stacks - Fix DSO heap overflow on decompressed paths, uninitialized pathname on fallback, set proper error codes - Fix various snprintf/scnprintf usages to prevent buffer overflows and truncation across the codebase - Fix off-by-one stack buffer overflow in kallsyms__parse() - Fix 'perf kwork' memory management, address sanitizer issues, bounds check work->cpu - Fix 'perf tpebs' concurrent stop races and PID reuse hazards - Add O_CLOEXEC to open() calls and use mkostemp() for temporary files to prevent file descriptor leaks to child processes - Fix s390 Python extension TEXTREL by compiling as PIC - Fix build with ASAN for jitdump - Fix build failure due to btf_vlen() return type change * tag 'perf-tools-for-v7.2-1-2026-06-22' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools: (343 commits) perf bpf: Fix up build failure due to change of btf_vlen() return type perf dso: Set standard errno on decompression failure perf bpf: Validate array presence before casting BPF prog info pointers perf c2c: Fix hist entry and format list leaks in c2c_he_free() perf c2c: Free format list entries when c2c_hists__init() fails perf cs-etm: Bounds-check CPU in cs_etm__get_queue() perf cs-etm: Require full global header in auxtrace_info size check perf cs-etm: Validate num_cpu before metadata allocation perf machine: Use snprintf() for guestmount path construction perf machine: Propagate machine__init() error to callers perf trace: Guard __probe_ip suppression with evsel__is_probe() perf evsel: Add lazy-initialized probe type detection helpers perf evsel: Add no-libtraceevent stubs for evsel__field() and evsel__common_field() perf cs-etm: Reject CPU IDs that would overflow signed comparison perf c2c: Free format list entries when releasing c2c hist entries perf bpf: Bounds-check array offsets in bpil_offs_to_addr() perf bpf: Reject oversized BPF metadata events that truncate header.size perf bpf: Validate func_info_rec_size and sub_id in synthesize_bpf_prog_name() perf sched: Replace (void*)1 sentinel with proper runtime allocation perf hwmon: Fix fd check to accept fd 0 in hwmon_pmu__describe_items() ... |
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Linus Torvalds
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18ecdd4d0a |
Merge tag 'probes-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull probes updates from Masami Hiramatsu:
- BTF support for dereferencing pointers
Add syntax to the parsing of eprobes to typecast structure pointer
trace event fields, enabling BTF-based dereferencing instead of
relying on manual offsets.
- Improvements and robustness enhancements
- Use flexible array for entry fetch code.
Store probe entry fetch instructions in the probe_entry_arg
allocation via a flexible array member to simplify memory
allocation and lifetime management.
- Replace BUG_ON with lockdep_assert_held in uprobe_buffer functions
Replace BUG_ON() calls with lockdep_assert_held() in uprobe buffer
enable/disable paths to prevent kernel crashes and better verify
lock ownership.
- Ensure the uprobe buffer size is bigger than event size.
Add a BUILD_BUG_ON() assertion to guarantee that the per-CPU
uprobe working buffer size is always larger than the maximum probe
event size.
* tag 'probes-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing/eprobes: Allow use of BTF names to dereference pointers
tracing: Replace BUG_ON with lockdep_assert_held in uprobe_buffer functions
tracing: Use flexible array for entry fetch code
tracing/probes: Ensure the uprobe buffer size is bigger than event size
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Linus Torvalds
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a87bbc4578 |
Merge tag 'docs-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux
Pull documentation updates from Jonathan Corbet:
"Things have calmed down a bit on the docs front, with no earthshaking
changes this time around:
- Ongoing work on the Japanese and Portuguese translations
- Better integration of the MAINTAINERS file into the rendered
documents, including a search interface
- A seemingly infinite supply of fixes for typos, minor grammatical
issues, and related problems that LLMs find with abandon"
* tag 'docs-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux: (93 commits)
docs: pt_BR: Translate 3.Early-stage.rst into Portuguese
docs: pt_BR: update "Purpose of Defconfigs" section in maintainer-soc.rst
Documentation: bug-hunting.rst: fix grammar
docs/ja_JP: translate submitting-patches.rst (interleaved-replies)
docs: Fix minor grammatical error
docs/{it_it,sp_SP,zh_CN,zh_TW}: update references to removed CONFIG_DEBUG_SLAB
Documentation: process: fix brackets
Documentation: arch: fix brackets
docs/dyndbg: explain flags parse 1st
docs/dyndbg: update examples \012 to \n
docs: kernel-parameters: Fix stale sticore file paths
docs: real-time: Fix duplicated sched(7) text
docs: kgdb: Fix stale source file paths
docs: sonypi: Fix stale header file path
docs: kernel-parameters: Remove sa1100ir IrDA parameter
iommu: Documentation: rearrange, update kernel-parameters
docs: md: fix grammar in speed_limit description
docs: changes.rst: restore pahole 1.26 minimum (regressed by sort)
Documentation: Fix syntax of kmalloc_objs example in coding style doc
docs: pt_BR: update maintainer-handbooks
...
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Linus Torvalds
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25a01b5155 |
Merge tag 's390-7.2-1' of gitolite.kernel.org:pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Alexander Gordeev: - Use CIO device online variable instead of the internal FSM state to determine device availability during purge operations - Remove extra check of task_stack_page() because try_get_task_stack() already takes care of that when reading /proc/<pid>/wchan - Allow user-space to use the new SCLP action qualifier 4 for to provide NVMe SMART log data to the platform. - Send AP CHANGE uevents on successful bind and successful association to notify user-space about SE operations on AP queue devices - Add an s390dbf kernel parameter to configure debug log levels and area sizes during early boot - On arm64 the empty zero page is going to be mapped read-only. Do the same for s390 with an explicit set_memory_ro() call - Improve s390-specific bcr_serialize() and cpu_relax() implementations - Remove all unused variables to avoid allmodconfig W=1 build fails with latest clang-23 - Cleanup default Kconfig values for s390 selftests - Add a s390-tod trace clock to allow comparing trace timestamps between different systems or virtual machines on s390 - Remove the s390 implementation of strlcat() in favor of the generic variant - Make consistent the calling order between page_table_check_pte_clear() and secure page conversion across all code paths - Rearrange some fields within AP and zcrypt structs to reduce memory consumption and unused holes - Shorten GR_NUM and VX_NUM macros and move them to a separate header - Replace __get_free_page() with kmalloc() in few sources - Introduce an infrastructure for more efficient this_cpu operations. Eliminate conditional branches when PREEMPT_NONE is removed - Enable Rust support - Use z10 as minimum architecture level, similar to the boot code, to enforce a defined architecture level set - Improve and convert various mem*() helper functions to C. For that add .noinstr.text section to avoid orphaned warnings from the linker - Fix the function pointer type in __ret_from_fork() to correct the indirect call to match kernel thread return type of int - Revert support for DCACHE_WORD_ACCESS to avoid an endless exception loop on read from donated Ultravisor pages at unaligned addresses * tag 's390-7.2-1' of gitolite.kernel.org:pub/scm/linux/kernel/git/s390/linux: (52 commits) s390: Revert support for DCACHE_WORD_ACCESS s390/process: Fix kernel thread function pointer type s390/tishift: Convert __ashlti3(), __ashrti3(), __lshrti3() to C s390/memmove: Optimize backward copy case s390/string: Convert memset(16|32|64)() to C s390/string: Convert memcpy() to C s390/string: Convert memset() to C s390/string: Convert memmove() to C s390/string: Add -ffreestanding compile option to string.o s390: Add .noinstr.text to boot and purgatory linker scripts s390/purgatory: Enforce z10 minimum architecture level s390: Enable Rust support s390/cmpxchg: Fix KASAN stack-out-of-bounds in atomic helpers rust: helpers: Add memchr wrapper for string operations rust/bindgen_parameters: Mark s390 types as opaque to prevent repr conflicts s390/jump_label: Implement ARCH_STATIC_BRANCH_JUMP_ASM and ARCH_STATIC_BRANCH_ASM macros s390/bug: Provide ARCH_WARN_ASM for Rust WARN/BUG support s390/ap: Fix locking issue in SE bind and associate sysfs functions s390/percpu: Provide arch_this_cpu_write() implementation s390/percpu: Provide arch_this_cpu_read() implementation ... |
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James Clark
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2f36f22f2b |
perf test cs-etm: Remove unused Coresight workloads
These are now unused and had various issues like not working with out of source builds and being slow to compile. Delete them. Signed-off-by: James Clark <james.clark@linaro.org> Tested-by: Leo Yan <leo.yan@arm.com> Cc: Amir Ayupov <aaupov@meta.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Mike Leach <mike.leach@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paschalis Mpeis <Paschalis.Mpeis@arm.com> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: Suzuki Poulouse <suzuki.poulose@arm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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Matthew Wilcox (Oracle)
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2911b93582 |
buffer: Remove submit_bh()
No users are left; remove this API. Also remove/fix comments mentioning it, and end_bio_bh_io_sync() as it's now unused. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Link: https://patch.msgid.link/20260528173150.1093780-32-willy@infradead.org Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> |
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Steven Rostedt
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69efd863a7 |
tracing/eprobes: Allow use of BTF names to dereference pointers
Add syntax to the parsing of eprobes to be able to typecast a trace event
field that is a pointer to a structure.
Currently, a dereference must be a number, where the user has to figure
out manually the offset of a member of a structure that they want to
dereference.
But for event probes that records a field that happens to be a pointer to
a structure, it cannot dereference these values with BTF naming, but
must use numerical offsets.
For example, to find out what device a sk_buff is pointing to in the
net_dev_xmit trace event, one must first use gdb to find the offsets of the
members of the structures:
(gdb) p &((struct sk_buff *)0)->dev
$1 = (struct net_device **) 0x10
(gdb) p &((struct net_device *)0)->name
$2 = (char (*)[16]) 0x118
And then use the raw numbers to dereference:
# echo 'e:xmit net.net_dev_xmit +0x118(+0x10($skbaddr)):string' >> dynamic_events
If BTF is in the kernel, then instead, the skbaddr can be typecast to
sk_buff and use the normal dereference logic.
# echo 'e:xmit net.net_dev_xmit (sk_buff)skbaddr->dev->name:string' >> dynamic_events
# echo 1 > events/eprobes/xmit/enable
# cat trace
[..]
sshd-session-1022 [000] b..2. 860.249343: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.250061: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.250142: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.263553: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.283820: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.302716: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.322905: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.342828: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.362268: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.382335: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.400856: xmit: (net.net_dev_xmit) arg1="enp7s0"
sshd-session-1022 [000] b..2. 860.419893: xmit: (net.net_dev_xmit) arg1="enp7s0"
The syntax is simply: (STRUCT)(FIELD)->MEMBER[->MEMBER..]
Also add comments around the #else and #endif of #ifdef CONFIG_PROBE_EVENTS_BTF_ARGS
to know what they are for.
Link: https://lore.kernel.org/all/20260601130746.2139d926@gandalf.local.home/
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
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Sven Schnelle
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29eb8a7b6e |
s390/tracing: Add s390-tod clock
In order to allow comparing trace timestamps between different systems or virtual machines on s390, add a s390-tod trace clock. This clock just uses the returned TOD clock value from stcke directly. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> |
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Gabriele Monaco
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49cbd359e4 |
Documentation/rv: Replace stale website link
The sched monitor page was linking to Daniel's website which is now
down. The main purpose of the link was to point to a source for the
models from the original author and that can be found also in his
published paper.
Replace the link with a reference to Daniel's "A thread synchronization
model for the PREEMPT_RT Linux kernel" which can be found online and
includes the models definitions as well as the work behind them (not the
original patches but since they're based on a 5.0 kernel and are mostly
included upstream, there's little value in keeping them in the docs).
Fixes:
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Ninad Naik
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1cf4830de2 |
Documentation: fix spelling mistake "stucture" -> "structure"
Fixing a spelling mistake in Documentation/trace/histogram-design.rst. Signed-off-by: Ninad Naik <ninadnaik07@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260419184527.779828-1-ninadnaik07@gmail.com> |
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Linus Torvalds
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fdbfee9fc5 |
Merge tag 'trace-rv-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull runtime verification updates from Steven Rostedt: - Refactor da_monitor header to share handlers across monitor types No functional changes, only less code duplication. - Add Hybrid Automata model class Add a new model class that extends deterministic automata by adding constraints on transitions and states. Those constraints can take into account wall-clock time and as such allow RV monitor to make assertions on real time. Add documentation and code generation scripts. - Add stall monitor as hybrid automaton example Add a monitor that triggers a violation when a task is stalling as an example of automaton working with real time variables. - Convert the opid monitor to a hybrid automaton The opid monitor can be heavily simplified if written as a hybrid automaton: instead of tracking preempt and interrupt enable/disable events, it can just run constraints on the preemption/interrupt states when events like wakeup and need_resched verify. - Add support for per-object monitors in DA/HA Allow writing deterministic and hybrid automata monitors for generic objects (e.g. any struct), by exploiting a hash table where objects are saved. This allows to track more than just tasks in RV. For instance it will be used to track deadline entities in deadline monitors. - Add deadline tracepoints and move some deadline utilities Prepare the ground for deadline monitors by defining events and exporting helpers. - Add nomiss deadline monitor Add first example of deadline monitor asserting all entities complete before their deadline. - Improve rvgen error handling Introduce AutomataError exception class and better handle expected exceptions while showing a backtrace for unexpected ones. - Improve python code quality in rvgen Refactor the rvgen generation scripts to align with python best practices: use f-strings instead of %, use len() instead of __len__(), remove semicolons, use context managers for file operations, fix whitespace violations, extract magic strings into constants, remove unused imports and methods. - Fix small bugs in rvgen The generator scripts presented some corner case bugs: logical error in validating what a correct dot file looks like, fix an isinstance() check, enforce a dot file has an initial state, fix type annotations and typos in comments. - rvgen refactoring Refactor automata.py to use iterator-based parsing and handle required arguments directly in argparse. - Allow epoll in rtapp-sleep monitor The epoll_wait call is now rt-friendly so it should be allowed in the sleep monitor as a valid sleep method. * tag 'trace-rv-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (32 commits) rv: Allow epoll in rtapp-sleep monitor rv/rvgen: fix _fill_states() return type annotation rv/rvgen: fix unbound loop variable warning rv/rvgen: enforce presence of initial state rv/rvgen: extract node marker string to class constant rv/rvgen: fix isinstance check in Variable.expand() rv/rvgen: make monitor arguments required in rvgen rv/rvgen: remove unused __get_main_name method rv/rvgen: remove unused sys import from dot2c rv/rvgen: refactor automata.py to use iterator-based parsing rv/rvgen: use class constant for init marker rv/rvgen: fix DOT file validation logic error rv/rvgen: fix PEP 8 whitespace violations rv/rvgen: fix typos in automata and generator docstring and comments rv/rvgen: use context managers for file operations rv/rvgen: remove unnecessary semicolons rv/rvgen: replace __len__() calls with len() rv/rvgen: replace % string formatting with f-strings rv/rvgen: remove bare except clauses in generator rv/rvgen: introduce AutomataError exception class ... |
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Linus Torvalds
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e4bf304f00 |
Merge tag 'trace-ringbuffer-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull ring-buffer updates from Steven Rostedt: - Add remote buffers for pKVM pKVM has a hypervisor component that is used to protect the guest from the host kernel. This hypervisor is a black box to the kernel as the kernel is to user space. The remote buffers are used to have a memory mapping between the hypervisor and the kernel where kernel may send commands to enable tracing within the hypervisor. Then the kernel will read this memory mapping just like user space can read the memory mapped ring buffer of the kernel tracing system. Since the hypervisor only has a single context, it doesn't need to worry about races between normal context, interrupt context and NMIs like the kernel does. The ring buffer it uses doesn't need to be as complex. The remote buffers are a simple version of the ring buffer that works in a single context. They are still per-CPU and use sub buffers. The data layout is the same as the kernel's ring buffer to share the same parsing. Currently, only ARM64 implements pKVM, but there's work to implement it also in x86. The remote buffer code is separated out from the ARM implementation so that it can be used in the future by x86. The ARM64 updates for pKVM is in the ARM/KVM tree and it merged in the remote buffers of this tree. - Make the backup instance non reusable The backup instance is a copy of the persistent ring buffer so that the persistent ring buffer could start recording again without using the data from the previous boot. The backup isn't for normal tracing. It is made read-only, and after it is consumed, it is automatically removed. - Have backup copy persistent instance before it starts recording To allow the persistent ring buffer to start recording from the kernel command line commands, move the copy of the backup instance to before the the command line options start recording. - Report header_page overwrite field as "char" and not "int' The rust parser of the header_page file was triggering a warning when it defined the overwrite variable as "int" but it was only a single byte in size. - Fix memory barriers for the trace_buffer CPU mask When a CPU comes online, the bit is set to allow readers to know that the CPU buffer is allocated. The bit is set after the allocation is done, and a smp_wmb() is performed after the allocation and before the setting of the bit. But instead of adding a smp_rmb() to all readers, since once a buffer is created for a CPU it is not deleted if that CPU goes offline, so this allocation is almost always done at boot up before any readers exist. If for the unlikely case where a CPU comes online for the first time after the system boot has finished, send an IPI to all CPUs to force the smp_rmb() for each CPU. - Show clock function being used in debugging ring buffer data When the ring buffer checks are enabled and the ring buffer detects an inconsistency in the times of the invents, print out the clock being used when the error occurred. There was a very hard to hit bug that would happen every so often and it ended up being only triggered when the jiffies clock was being used. If the bug showed the clock being used, it would have been much easier to find the problem (which was an internal function was being traced which caused the clock accounting to go off). * tag 'trace-ringbuffer-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (26 commits) ring-buffer: Prevent off-by-one array access in ring_buffer_desc_page() ring-buffer: Report header_page overwrite as char tracing: Allow backup to save persistent ring buffer before it starts tracing/Documentation: Add a section about backup instance tracing: Remove the backup instance automatically after read tracing: Make the backup instance non-reusable ring-buffer: Enforce read ordering of trace_buffer cpumask and buffers ring-buffer: Show what clock function is used on timestamp errors tracing: Check for undefined symbols in simple_ring_buffer tracing: load/unload page callbacks for simple_ring_buffer Documentation: tracing: Add tracing remotes tracing: selftests: Add trace remote tests tracing: Add a trace remote module for testing tracing: Introduce simple_ring_buffer ring-buffer: Export buffer_data_page and macros tracing: Add helpers to create trace remote events tracing: Add events/ root files to trace remotes tracing: Add events to trace remotes tracing: Add init callback to trace remotes tracing: Add non-consuming read to trace remotes ... |
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Linus Torvalds
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40286d6379 |
Merge tag 'pci-v7.1-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
Pull pci updates from Bjorn Helgaas:
"Enumeration:
- Allow TLP Processing Hints to be enabled for RCiEPs (George Abraham
P)
- Enable AtomicOps only if we know the Root Port supports them (Gerd
Bayer)
- Don't enable AtomicOps for RCiEPs since none of them need Atomic
Ops and we can't tell whether the Root Complex would support them
(Gerd Bayer)
- Leave Precision Time Measurement disabled until a driver enables it
to avoid PCIe errors (Mika Westerberg)
- Make pci_set_vga_state() fail if bridge doesn't support VGA
routing, i.e., PCI_BRIDGE_CTL_VGA is not writable, and return
errors to vga_get() callers including userspace via
/dev/vga_arbiter (Simon Richter)
- Validate max-link-speed from DT in j721e, brcmstb, mediatek-gen3,
rzg3s drivers (where the actual controller constraints are known),
and remove validation from the generic OF DT accessor (Hans Zhang)
- Remove pc110pad driver (no longer useful after 486 CPU support
removed) and no_pci_devices() (pc110pad was the last user) (Dmitry
Torokhov, Heiner Kallweit)
Resource management:
- Prevent assigning space to unimplemented bridge windows; previously
we mistakenly assumed prefetchable window existed and assigned
space and put a BAR there (Ahmed Naseef)
- Avoid shrinking bridge windows to fit in the initial Root Port
window; fixes one problem with devices with large BARs connected
via switches, e.g., Thunderbolt (Ilpo Järvinen)
- Pass full extent of empty space, not just the aligned space, to
resource_alignf callback so free space before the requested
alignment can be used (Ilpo Järvinen)
- Place small resources before larger ones for better utilization of
address space (Ilpo Järvinen)
- Fix alignment calculation for resource size larger than align,
e.g., bridge windows larger than the 1MB required alignment (Ilpo
Järvinen)
Reset:
- Update slot handling so all ARI functions are treated as being in
the same slot. They're all reset by Secondary Bus Reset, but
previously drivers of ARI functions that appeared to be on a
non-zero device weren't notified and fatal hardware errors could
result (Keith Busch)
- Make sysfs reset_subordinate hotplug safe to avoid spurious hotplug
events (Keith Busch)
- Hide Secondary Bus Reset ('bus') from sysfs reset_methods if masked
by CXL because it has no effect (Vidya Sagar)
- Avoid FLR for AMD NPU device, where it causes the device to hang
(Lizhi Hou)
Error handling:
- Clear only error bits in PCIe Device Status to avoid accidentally
clearing Emergency Power Reduction Detected (Shuai Xue)
- Check for AER errors even in devices without drivers (Lukas Wunner)
- Initialize ratelimit info so DPC and EDR paths log AER error
information (Kuppuswamy Sathyanarayanan)
Power control:
- Add UPD720201/UPD720202 USB 3.0 xHCI Host Controller .compatible so
generic pwrctrl driver can control it (Neil Armstrong)
Hotplug:
- Set LED_HW_PLUGGABLE for NPEM hotplug-capable ports so LED core
doesn't complain when setting brightness fails because the endpoint
is gone (Richard Cheng)
Peer-to-peer DMA:
- Allow wildcards in list of host bridges that support peer-to-peer
DMA between hierarchy domains and add all Google SoCs (Jacob
Moroni)
Endpoint framework:
- Advertise dynamic inbound mapping support in pci-epf-test and
update host pci_endpoint_test to skip doorbell testing if not
advertised by endpoint (Koichiro Den)
- Return 0, not remaining timeout, when MHI eDMA ops complete so
mhi_ep_ring_add_element() doesn't interpret non-zero as failure
(Daniel Hodges)
- Remove vntb and ntb duplicate resource teardown that leads to oops
when .allow_link() fails or .drop_link() is called (Koichiro Den)
- Disable vntb delayed work before clearing BAR mappings and
doorbells to avoid oops caused by doing the work after resources
have been torn down (Koichiro Den)
- Add a way to describe reserved subregions within BARs, e.g.,
platform-owned fixed register windows, and use it for the RK3588
BAR4 DMA ctrl window (Koichiro Den)
- Add BAR_DISABLED for BARs that will never be available to an EPF
driver, and change some BAR_RESERVED annotations to BAR_DISABLED
(Niklas Cassel)
- Add NTB .get_dma_dev() callback for cases where DMA API requires a
different device, e.g., vNTB devices (Koichiro Den)
- Add reserved region types for MSI-X Table and PBA so Endpoint
controllers can them as describe hardware-owned regions in a
BAR_RESERVED BAR (Manikanta Maddireddy)
- Make Tegra194/234 BAR0 programmable and remove 1MB size limit
(Manikanta Maddireddy)
- Expose Tegra BAR2 (MSI-X) and BAR4 (DMA) as 64-bit BAR_RESERVED
(Manikanta Maddireddy)
- Add Tegra194 and Tegra234 device table entries to pci_endpoint_test
(Manikanta Maddireddy)
- Skip the BAR subrange selftest if there are not enough inbound
window resources to run the test (Christian Bruel)
New native PCIe controller drivers:
- Add DT binding and driver for Andes QiLai SoC PCIe host controller
(Randolph Lin)
- Add DT binding and driver for ESWIN PCIe Root Complex (Senchuan
Zhang)
Baikal T-1 PCIe controller driver:
- Remove driver since it never quite became usable (Andy Shevchenko)
Cadence PCIe controller driver:
- Implement byte/word config reads with dword (32-bit) reads because
some Cadence controllers don't support sub-dword accesses (Aksh
Garg)
CIX Sky1 PCIe controller driver:
- Add 'power-domains' to DT binding for SCMI power domain (Gary Yang)
Freescale i.MX6 PCIe controller driver:
- Add i.MX94 and i.MX943 to fsl,imx6q-pcie-ep DT binding (Richard
Zhu)
- Delay instead of polling for L2/L3 Ready after PME_Turn_off when
suspending i.MX6SX because LTSSM registers are inaccessible
(Richard Zhu)
- Separate PERST# assertion (for resetting endpoints) from core reset
(for resetting the RC itself) to prepare for new DTs with PERST#
GPIO in per-Root Port nodes (Sherry Sun)
- Retain Root Port MSI capability on i.MX7D, i.MX8MM, and i.MX8MQ so
MSI from downstream devices will work (Richard Zhu)
- Fix i.MX95 reference clock source selection when internal refclk is
used (Franz Schnyder)
Freescale Layerscape PCIe controller driver:
- Allow building as a removable module (Sascha Hauer)
MediaTek PCIe Gen3 controller driver:
- Use dev_err_probe() to simplify error paths and make deferred probe
messages visible in /sys/kernel/debug/devices_deferred (Chen-Yu
Tsai)
- Power off device if setup fails (Chen-Yu Tsai)
- Integrate new pwrctrl API to enable power control for WiFi/BT
adapters on mainboard or in PCIe or M.2 slots (Chen-Yu Tsai)
NVIDIA Tegra194 PCIe controller driver:
- Poll less aggressively and non-atomically for PME_TO_Ack during
transition to L2 (Vidya Sagar)
- Disable LTSSM after transition to Detect on surprise link down to
stop toggling between Polling and Detect (Manikanta Maddireddy)
- Don't force the device into the D0 state before L2 when suspending
or shutting down the controller (Vidya Sagar)
- Disable PERST# IRQ only in Endpoint mode because it's not
registered in Root Port mode (Manikanta Maddireddy)
- Handle 'nvidia,refclk-select' as optional (Vidya Sagar)
- Disable direct speed change in Endpoint mode so link speed change
is controlled by the host (Vidya Sagar)
- Set LTR values before link up to avoid bogus LTR messages with 0
latency (Vidya Sagar)
- Allow system suspend when the Endpoint link is down (Vidya Sagar)
- Use DWC IP core version, not Tegra custom values, to avoid DWC core
version check warnings (Manikanta Maddireddy)
- Apply ECRC workaround to devices based on DesignWare 5.00a as well
as 4.90a (Manikanta Maddireddy)
- Disable PM Substate L1.2 in Endpoint mode to work around Tegra234
erratum (Vidya Sagar)
- Delay post-PERST# cleanup until core is powered on to avoid CBB
timeout (Manikanta Maddireddy)
- Assert CLKREQ# so switches that forward it to their downstream side
can bring up those links successfully (Vidya Sagar)
- Calibrate pipe to UPHY for Endpoint mode to reset stale PLL state
from any previous bad link state (Vidya Sagar)
- Remove IRQF_ONESHOT flag from Endpoint interrupt registration so
DMA driver and Endpoint controller driver can share the interrupt
line (Vidya Sagar)
- Enable DMA interrupt to support DMA in both Root Port and Endpoint
modes (Vidya Sagar)
- Enable hardware link retraining after link goes down in Endpoint
mode (Vidya Sagar)
- Add DT binding and driver support for core clock monitoring (Vidya
Sagar)
Qualcomm PCIe controller driver:
- Advertise 'Hot-Plug Capable' and set 'No Command Completed Support'
since Qcom Root Ports support hotplug events like DL_Up/Down and
can accept writes to Slot Control without delays between writes
(Krishna Chaitanya Chundru)
Renesas R-Car PCIe controller driver:
- Mark Endpoint BAR0 and BAR2 as Resizable (Koichiro Den)
- Reduce EPC BAR alignment requirement to 4K (Koichiro Den)
Renesas RZ/G3S PCIe controller driver:
- Add RZ/G3E to DT binding and to driver (John Madieu)
- Assert (not deassert) resets in probe error path (John Madieu)
- Assert resets in suspend path in reverse order they were deasserted
during probe (John Madieu)
- Rework inbound window algorithm to prevent mapping more than
intended region and enforce alignment on size, to prepare for
RZ/G3E support (John Madieu)
Rockchip DesignWare PCIe controller driver:
- Add tracepoints for PCIe controller LTSSM transitions and link rate
changes (Shawn Lin)
- Trace LTSSM events collected by the dw-rockchip debug FIFO (Shawn
Lin)
SOPHGO PCIe controller driver:
- Disable ASPM L0s and L1 on Sophgo 2042 PCIe Root Ports that
advertise support for them (Yao Zi)
Synopsys DesignWare PCIe controller driver:
- Continue with system suspend even if an Endpoint doesn't respond
with PME_TO_Ack message (Manivannan Sadhasivam)
- Set Endpoint MSI-X Table Size in the correct function of a
multi-function device when configuring MSI-X, not in Function 0
(Aksh Garg)
- Set Max Link Width and Max Link Speed for all functions of a
multi-function device, not just Function 0 (Aksh Garg)
- Expose PCIe event counters in groups 5-7 in debugfs (Hans Zhang)
Miscellaneous:
- Warn only once about invalid ACS kernel parameter format (Richard
Cheng)
- Suppress FW_BUG warning when writing sysfs 'numa_node' with the
current value (Li RongQing)
- Drop redundant 'depends on PCI' from Kconfig (Julian Braha)"
* tag 'pci-v7.1-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci: (165 commits)
PCI/P2PDMA: Add Google SoCs to the P2P DMA host bridge list
PCI/P2PDMA: Allow wildcard Device IDs in host bridge list
PCI: sg2042: Avoid L0s and L1 on Sophgo 2042 PCIe Root Ports
PCI: cadence: Add flags for disabling ASPM capability for broken Root Ports
PCI: tegra194: Add core monitor clock support
dt-bindings: PCI: tegra194: Add monitor clock support
PCI: tegra194: Enable hardware hot reset mode in Endpoint mode
PCI: tegra194: Enable DMA interrupt
PCI: tegra194: Remove IRQF_ONESHOT flag during Endpoint interrupt registration
PCI: tegra194: Calibrate pipe to UPHY for Endpoint mode
PCI: tegra194: Assert CLKREQ# explicitly by default
PCI: tegra194: Fix CBB timeout caused by DBI access before core power-on
PCI: tegra194: Disable L1.2 capability of Tegra234 EP
PCI: dwc: Apply ECRC workaround to DesignWare 5.00a as well
PCI: tegra194: Use DWC IP core version
PCI: tegra194: Free up Endpoint resources during remove()
PCI: tegra194: Allow system suspend when the Endpoint link is not up
PCI: tegra194: Set LTR message request before PCIe link up in Endpoint mode
PCI: tegra194: Disable direct speed change for Endpoint mode
PCI: tegra194: Use devm_gpiod_get_optional() to parse "nvidia,refclk-select"
...
|
||
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Steven Rostedt
|
1eab6493f5 |
tracing: Documentation: Update histogram-design.rst for fn() handling
The histogram documentation describes the old method of the histogram triggers using the fn() field of the histogram field structure to process the field. But due to Spectre mitigation, the function pointer to handle the fields at runtime caused a noticeable overhead. It was converted over to a fn_num and hist_fn_call() is now used to call the specific functions for the fields via a switch statement based on the field's fn_num value. Update the documentation to reflect this change. Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260126181742.03e8f0d5@gandalf.local.home> |
||
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Shawn Lin
|
a3966a6f91 |
Documentation: tracing: Add PCI controller event documentation
The PCI controller tracepoint, pcie_ltssm_state_transition, monitors the LTSSM state transition and data rate changes for debugging purposes. Add documentation for it. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> [mani: added MAINTAINERS entry] Signed-off-by: Manivannan Sadhasivam <mani@kernel.org> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Link: https://patch.msgid.link/1774403912-210670-3-git-send-email-shawn.lin@rock-chips.com |
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Masami Hiramatsu (Google)
|
e53ba177c2 |
tracing/Documentation: Add a section about backup instance
Add a section about backup instance to the debugging.rst. Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://patch.msgid.link/177502548479.1311542.7062269603547001007.stgit@mhiramat.tok.corp.google.com Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> |
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Gabriele Monaco
|
b133207deb |
rv: Add nomiss deadline monitor
Add the deadline monitors collection to validate the deadline scheduler,
both for deadline tasks and servers.
The currently implemented monitors are:
* nomiss:
validate dl entities run to completion before their deadiline
Reviewed-by: Nam Cao <namcao@linutronix.de>
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://lore.kernel.org/r/20260330111010.153663-13-gmonaco@redhat.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
|
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Gabriele Monaco
|
2b406fdb33 |
rv: Convert the opid monitor to a hybrid automaton
The opid monitor validates that wakeup and need_resched events only occur with interrupts and preemption disabled by following the preemptirq tracepoints. As reported in [1], those tracepoints might be inaccurate in some situations (e.g. NMIs). Since the monitor doesn't validate other ordering properties, remove the dependency on preemptirq tracepoints and convert the monitor to a hybrid automaton to validate the constraint during event handling. This makes the monitor more robust by also removing the workaround for interrupts missing the preemption tracepoints, which was working on PREEMPT_RT only and allows the monitor to be built on kernels without the preemptirqs tracepoints. [1] - https://lore.kernel.org/lkml/20250625120823.60600-1-gmonaco@redhat.com Reviewed-by: Nam Cao <namcao@linutronix.de> Link: https://lore.kernel.org/r/20260330111010.153663-8-gmonaco@redhat.com Signed-off-by: Gabriele Monaco <gmonaco@redhat.com> |
||
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Gabriele Monaco
|
13578a0871 |
rv: Add sample hybrid monitor stall
Add a sample monitor to showcase hybrid/timed automata. The stall monitor identifies tasks stalled for longer than a threshold and reacts when that happens. Reviewed-by: Nam Cao <namcao@linutronix.de> Link: https://lore.kernel.org/r/20260330111010.153663-7-gmonaco@redhat.com Signed-off-by: Gabriele Monaco <gmonaco@redhat.com> |
||
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Gabriele Monaco
|
708340c271 |
Documentation/rv: Add documentation about hybrid automata
Describe theory and implementation of hybrid automata in the dedicated page hybrid_automata.rst Include a section on how to integrate a hybrid automaton in monitor_synthesis.rst Also remove a hanging $ in deterministic_automata.rst Reviewed-by: Nam Cao <namcao@linutronix.de> Reviewed-by: Juri Lelli <juri.lelli@redhat.com> Link: https://lore.kernel.org/r/20260330111010.153663-6-gmonaco@redhat.com Signed-off-by: Gabriele Monaco <gmonaco@redhat.com> |
||
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Vincent Donnefort
|
c88d510584 |
Documentation: tracing: Add tracing remotes
Add documentation about the newly introduced tracing remotes framework. Link: https://patch.msgid.link/20260309162516.2623589-17-vdonnefort@google.com Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Vincent Donnefort <vdonnefort@google.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> |
||
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Linus Torvalds
|
505d195b0f |
Merge tag 'char-misc-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc/IIO driver updates from Greg KH: "Here is the big set of char/misc/iio and other smaller driver subsystem changes for 7.0-rc1. Lots of little things in here, including: - Loads of iio driver changes and updates and additions - gpib driver updates - interconnect driver updates - i3c driver updates - hwtracing (coresight and intel) driver updates - deletion of the obsolete mwave driver - binder driver updates (rust and c versions) - mhi driver updates (causing a merge conflict, see below) - mei driver updates - fsi driver updates - eeprom driver updates - lots of other small char and misc driver updates and cleanups All of these have been in linux-next for a while, with no reported issues" * tag 'char-misc-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (297 commits) mux: mmio: fix regmap leak on probe failure rust_binder: return p from rust_binder_transaction_target_node() drivers: android: binder: Update ARef imports from sync::aref rust_binder: fix needless borrow in context.rs iio: magn: mmc5633: Fix Kconfig for combination of I3C as module and driver builtin iio: sca3000: Fix a resource leak in sca3000_probe() iio: proximity: rfd77402: Add interrupt handling support iio: proximity: rfd77402: Document device private data structure iio: proximity: rfd77402: Use devm-managed mutex initialization iio: proximity: rfd77402: Use kernel helper for result polling iio: proximity: rfd77402: Align polling timeout with datasheet iio: cros_ec: Allow enabling/disabling calibration mode iio: frequency: ad9523: correct kernel-doc bad line warning iio: buffer: buffer_impl.h: fix kernel-doc warnings iio: gyro: itg3200: Fix unchecked return value in read_raw MAINTAINERS: add entry for ADE9000 driver iio: accel: sca3000: remove unused last_timestamp field iio: accel: adxl372: remove unused int2_bitmask field iio: adc: ad7766: Use iio_trigger_generic_data_rdy_poll() iio: magnetometer: Remove IRQF_ONESHOT ... |
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Linus Torvalds
|
3c6e577d5a |
Merge tag 'trace-v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull tracing updates from Steven Rostedt:
"User visible changes:
- Add an entry into MAINTAINERS file for RUST versions of code
There's now RUST code for tracing and static branches. To
differentiate that code from the C code, add entries in for the
RUST version (with "[RUST]" around it) so that the right
maintainers get notified on changes.
- New bitmask-list option added to tracefs
When this is set, bitmasks in trace event are not displayed as hex
numbers, but instead as lists: e.g. 0-5,7,9 instead of 0000015f
- New show_event_filters file in tracefs
Instead of having to search all events/*/*/filter for any active
filters enabled in the trace instance, the file show_event_filters
will list them so that there's only one file that needs to be
examined to see if any filters are active.
- New show_event_triggers file in tracefs
Instead of having to search all events/*/*/trigger for any active
triggers enabled in the trace instance, the file
show_event_triggers will list them so that there's only one file
that needs to be examined to see if any triggers are active.
- Have traceoff_on_warning disable trace pintk buffer too
Recently recording of trace_printk() could go to other trace
instances instead of the top level instance. But if
traceoff_on_warning triggers, it doesn't stop the buffer with
trace_printk() and that data can easily be lost by being
overwritten. Have traceoff_on_warning also disable the instance
that has trace_printk() being written to it.
- Update the hist_debug file to show what function the field uses
When CONFIG_HIST_TRIGGERS_DEBUG is enabled, a hist_debug file
exists for every event. This displays the internal data of any
histogram enabled for that event. But it is lacking the function
that is called to process one of its fields. This is very useful
information that was missing when debugging histograms.
- Up the histogram stack size from 16 to 31
Stack traces can be used as keys for event histograms. Currently
the size of the stack that is stored is limited to just 16 entries.
But the storage space in the histogram is 256 bytes, meaning that
it can store up to 31 entries (plus one for the count of entries).
Instead of letting that space go to waste, up the limit from 16 to
31. This makes the keys much more useful.
- Fix permissions of per CPU file buffer_size_kb
The per CPU file of buffer_size_kb was incorrectly set to read only
in a previous cleanup. It should be writable.
- Reset "last_boot_info" if the persistent buffer is cleared
The last_boot_info shows address information of a persistent ring
buffer if it contains data from a previous boot. It is cleared when
recording starts again, but it is not cleared when the buffer is
reset. The data is useless after a reset so clear it on reset too.
Internal changes:
- A change was made to allow tracepoint callbacks to have preemption
enabled, and instead be protected by SRCU. This required some
updates to the callbacks for perf and BPF.
perf needed to disable preemption directly in its callback because
it expects preemption disabled in the later code.
BPF needed to disable migration, as its code expects to run
completely on the same CPU.
- Have irq_work wake up other CPU if current CPU is "isolated"
When there's a waiter waiting on ring buffer data and a new event
happens, an irq work is triggered to wake up that waiter. This is
noisy on isolated CPUs (running NO_HZ_FULL). Trigger an IPI to a
house keeping CPU instead.
- Use proper free of trigger_data instead of open coding it in.
- Remove redundant call of event_trigger_reset_filter()
It was called immediately in a function that was called right after
it.
- Workqueue cleanups
- Report errors if tracing_update_buffers() were to fail.
- Make the enum update workqueue generic for other parts of tracing
On boot up, a work queue is created to convert enum names into
their numbers in the trace event format files. This work queue can
also be used for other aspects of tracing that takes some time and
shouldn't be called by the init call code.
The blk_trace initialization takes a bit of time. Have the
initialization code moved to the new tracing generic work queue
function.
- Skip kprobe boot event creation call if there's no kprobes defined
on cmdline
The kprobe initialization to set up kprobes if they are defined on
the cmdline requires taking the event_mutex lock. This can be held
by other tracing code doing initialization for a long time. Since
kprobes added to the kernel command line need to be setup
immediately, as they may be tracing early initialization code, they
cannot be postponed in a work queue and must be setup in the
initcall code.
If there's no kprobe on the kernel cmdline, there's no reason to
take the mutex and slow down the boot up code waiting to get the
lock only to find out there's nothing to do. Simply exit out early
if there's no kprobes on the kernel cmdline.
If there are kprobes on the cmdline, then someone cares more about
tracing over the speed of boot up.
- Clean up the trigger code a bit
- Move code out of trace.c and into their own files
trace.c is now over 11,000 lines of code and has become more
difficult to maintain. Start splitting it up so that related code
is in their own files.
Move all the trace_printk() related code into trace_printk.c.
Move the __always_inline stack functions into trace.h.
Move the pid filtering code into a new trace_pid.c file.
- Better define the max latency and snapshot code
The latency tracers have a "max latency" buffer that is a copy of
the main buffer and gets swapped with it when a new high latency is
detected. This keeps the trace up to the highest latency around
where this max_latency buffer is never written to. It is only used
to save the last max latency trace.
A while ago a snapshot feature was added to tracefs to allow user
space to perform the same logic. It could also enable events to
trigger a "snapshot" if one of their fields hit a new high. This
was built on top of the latency max_latency buffer logic.
Because snapshots came later, they were dependent on the latency
tracers to be enabled. In reality, the latency tracers depend on
the snapshot code and not the other way around. It was just that
they came first.
Restructure the code and the kconfigs to have the latency tracers
depend on snapshot code instead. This actually simplifies the logic
a bit and allows to disable more when the latency tracers are not
defined and the snapshot code is.
- Fix a "false sharing" in the hwlat tracer code
The loop to search for latency in hardware was using a variable
that could be changed by user space for each sample. If the user
change this variable, it could cause a bus contention, and reading
that variable can show up as a large latency in the trace causing a
false positive. Read this variable at the start of the sample with
a READ_ONCE() into a local variable and keep the code from sharing
cache lines with readers.
- Fix function graph tracer static branch optimization code
When only one tracer is defined for function graph tracing, it uses
a static branch to call that tracer directly. When another tracer
is added, it goes into loop logic to call all the registered
callbacks.
The code was incorrect when going back to one tracer and never
re-enabled the static branch again to do the optimization code.
- And other small fixes and cleanups"
* tag 'trace-v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (46 commits)
function_graph: Restore direct mode when callbacks drop to one
tracing: Fix indentation of return statement in print_trace_fmt()
tracing: Reset last_boot_info if ring buffer is reset
tracing: Fix to set write permission to per-cpu buffer_size_kb
tracing: Fix false sharing in hwlat get_sample()
tracing: Move d_max_latency out of CONFIG_FSNOTIFY protection
tracing: Better separate SNAPSHOT and MAX_TRACE options
tracing: Add tracer_uses_snapshot() helper to remove #ifdefs
tracing: Rename trace_array field max_buffer to snapshot_buffer
tracing: Move pid filtering into trace_pid.c
tracing: Move trace_printk functions out of trace.c and into trace_printk.c
tracing: Use system_state in trace_printk_init_buffers()
tracing: Have trace_printk functions use flags instead of using global_trace
tracing: Make tracing_update_buffers() take NULL for global_trace
tracing: Make printk_trace global for tracing system
tracing: Move ftrace_trace_stack() out of trace.c and into trace.h
tracing: Move __trace_buffer_{un}lock_*() functions to trace.h
tracing: Make tracing_selftest_running global to the tracing subsystem
tracing: Make tracing_disabled global for tracing system
tracing: Clean up use of trace_create_maxlat_file()
...
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Linus Torvalds
|
f75c03a761 |
Merge tag 'trace-rv-v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull runtime verifier updates from Steven Rostedt: - Refactor da_monitor to minimize macros Complete refactor of da_monitor.h to reduce reliance on macros generating functions. Use generic static functions and uses the preprocessor only when strictly necessary (e.g. for tracepoint handlers). The change essentially relies on functions with generic names (e.g. da_handle) instead of monitor-specific as well adding the need to define constant (e.g. MONITOR_NAME, MONITOR_TYPE) before including the header rather than calling macros that would define functions. Also adapt monitors and documentation accordingly. - Cleanup DA code generation scripts Clean up functions in dot2c removing reimplementations of trivial library functions (__buff_to_string) and removing some other unused intermediate steps. - Annotate functions with types in the rvgen python scripts - Remove superfluous assignments and cleanup generated code The rvgen scripts generate a superfluous assignment to 0 for enum variables and don't add commas to the last elements, which is against the kernel coding standards. Change the generation process for a better compliance and slightly simpler logic. - Remove superfluous declarations from generated code The monitor container source files contained a declaration and a definition for the rv_monitor variable. The former is superfluous and was removed. - Fix reference to outdated documentation s/da_monitor_synthesis.rst/monitor_synthesis.rst in comment in da_monitor.h * tag 'trace-rv-v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: rv: Fix documentation reference in da_monitor.h verification/rvgen: Remove unused variable declaration from containers verification/dot2c: Remove superfluous enum assignment and add last comma verification/dot2c: Remove __buff_to_string() and cleanup verification/rvgen: Annotate DA functions with types verification/rvgen: Adapt dot2k and templates after refactoring da_monitor.h Documentation/rv: Adapt documentation after da_monitor refactoring rv: Cleanup da_monitor after refactor rv: Refactor da_monitor to minimise macros |
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Linus Torvalds
|
1c2b4a4c2b |
Merge tag 'pci-v7.0-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
Pull PCI updates from Bjorn Helgaas:
"Enumeration:
- Don't try to enable Extended Tags on VFs since that bit is Reserved
and causes misleading log messages (Håkon Bugge)
- Initialize Endpoint Read Completion Boundary to match Root Port,
regardless of ACPI _HPX (Håkon Bugge)
- Apply _HPX PCIe Setting Record only to AER configuration, and only
when OS owns PCIe hotplug but not AER, to avoid clobbering Extended
Tag and Relaxed Ordering settings (Håkon Bugge)
Resource management:
- Move CardBus code to setup-cardbus.c and only build it when
CONFIG_CARDBUS is set (Ilpo Järvinen)
- Fix bridge window alignment with optional resources, where
additional alignment requirement was previously lost (Ilpo
Järvinen)
- Stop over-estimating bridge window size since they are now assigned
without any gaps between them (Ilpo Järvinen)
- Increase resource MAX_IORES_LEVEL to avoid /proc/iomem flattening
for nested bridges and endpoints (Ilpo Järvinen)
- Add pbus_mem_size_optional() to handle sizes of optional resources
(SR-IOV VF BARs, expansion ROMs, bridge windows) (Ilpo Järvinen)
- Don't claim disabled bridge windows to avoid spurious claim
failures (Ilpo Järvinen)
Driver binding:
- Fix device reference leak in pcie_port_remove_service() (Uwe
Kleine-König)
- Move pcie_port_bus_match() and pcie_port_bus_type to PCIe-specific
portdrv.c (Uwe Kleine-König)
- Convert portdrv to use pcie_port_bus_type.probe() and .remove()
callbacks so .probe() and .remove() can eventually be removed from
struct device_driver (Uwe Kleine-König)
Error handling:
- Clear stale errors on reporting agents upon probe so they don't
look like recent errors (Lukas Wunner)
- Add generic RAS tracepoint for hotplug events (Shuai Xue)
- Add RAS tracepoint for link speed changes (Shuai Xue)
Power management:
- Avoid redundant delay on transition from D3hot to D3cold if the
device was already in D3hot (Brian Norris)
- Prevent runtime suspend until devices are fully initialized to
avoid saving incompletely configured device state (Brian Norris)
Power control:
- Add power_on/off callbacks with generic signature to pwrseq,
tc9563, and slot drivers so they can be used by pwrctrl core
(Manivannan Sadhasivam)
- Add PCIe M.2 connector support to the slot pwrctrl driver
(Manivannan Sadhasivam)
- Switch to pwrctrl interfaces to create, destroy, and power on/off
devices, calling them from host controller drivers instead of the
PCI core (Manivannan Sadhasivam)
- Drop qcom .assert_perst() callbacks since this is now done by the
controller driver instead of the pwrctrl driver (Manivannan
Sadhasivam)
Virtualization:
- Remove an incorrect unlock in pci_slot_trylock() error handling
(Jinhui Guo)
- Lock the bridge device for slot reset (Keith Busch)
- Enable ACS after IOMMU configuration on OF platforms so ACS is
enabled an all devices; previously the first device enumerated
(typically a Root Port) didn't have ACS enabled (Manivannan
Sadhasivam)
- Disable ACS Source Validation for IDT 0x80b5 and 0x8090 switches to
work around hardware erratum; previously ACS SV was only
temporarily disabled, which worked for enumeration but not after
reset (Manivannan Sadhasivam)
Peer-to-peer DMA:
- Release per-CPU pgmap ref when vm_insert_page() fails to avoid hang
when removing the PCI device (Hou Tao)
- Remove incorrect p2pmem_alloc_mmap() warning about page refcount
(Hou Tao)
Endpoint framework:
- Add configfs sub-groups synchronously to avoid NULL pointer
dereference when racing with removal (Liu Song)
- Fix swapped parameters in pci_{primary/secondary}_epc_epf_unlink()
functions (Manikanta Maddireddy)
ASPEED PCIe controller driver:
- Add ASPEED Root Complex DT binding and driver (Jacky Chou)
Freescale i.MX6 PCIe controller driver:
- Add DT binding and driver support for an optional external refclock
in addition to the refclock from the internal PLL (Richard Zhu)
- Fix CLKREQ# control so host asserts it during enumeration and
Endpoints can use it afterwards to exit the L1.2 link state
(Richard Zhu)
NVIDIA Tegra PCIe controller driver:
- Export irq_domain_free_irqs() to allow PCI/MSI drivers that tear
down MSI domains to be built as modules (Aaron Kling)
- Allow pci-tegra to be built as a module (Aaron Kling)
NVIDIA Tegra194 PCIe controller driver:
- Relax Kconfig so tegra194 can be built for platforms beyond
Tegra194 (Vidya Sagar)
Qualcomm PCIe controller driver:
- Merge SC8180x DT binding into SM8150 (Krzysztof Kozlowski)
- Move SDX55, SDM845, QCS404, IPQ5018, IPQ6018, IPQ8074 Gen3,
IPQ8074, IPQ4019, IPQ9574, APQ8064, MSM8996, APQ8084 to dedicated
schema (Krzysztof Kozlowski)
- Add DT binding and driver support for SA8255p Endpoint being
configured by firmware (Mrinmay Sarkar)
- Parse PERST# from all PCIe bridge nodes for future platforms that
will have PERST# in Switch Downstream Ports as well as in Root
Ports (Manivannan Sadhasivam)
Renesas RZ/G3S PCIe controller driver:
- Use pci_generic_config_write() since the writability provided by
the custom wrapper is unnecessary (Claudiu Beznea)
SOPHGO PCIe controller driver:
- Disable ASPM L0s and L1 on Sophgo 2044 PCIe Root Ports (Inochi
Amaoto)
Synopsys DesignWare PCIe controller driver:
- Extend PCI_FIND_NEXT_CAP() and PCI_FIND_NEXT_EXT_CAP() to return a
pointer to the preceding Capability, to allow removal of
Capabilities that are advertised but not fully implemented (Qiang
Yu)
- Remove MSI and MSI-X Capabilities in platforms that can't support
them, so the PCI core automatically falls back to INTx (Qiang Yu)
- Add ASPM L1.1 and L1.2 Substates context to debugfs ltssm_status
for drivers that support this (Shawn Lin)
- Skip PME_Turn_Off broadcast and L2/L3 transition during suspend if
link is not up to avoid an unnecessary timeout (Manivannan
Sadhasivam)
- Revert dw-rockchip, qcom, and DWC core changes that used link-up
IRQs to trigger enumeration instead of waiting for link to be up
because the PCI core doesn't allocate bus number space for
hierarchies that might be attached (Niklas Cassel)
- Make endpoint iATU entry for MSI permanent instead of programming
it dynamically, which is slow and racy with respect to other
concurrent traffic, e.g., eDMA (Koichiro Den)
- Use iMSI-RX MSI target address when possible to fix endpoints using
32-bit MSI (Shawn Lin)
- Allow DWC host controller driver probe to continue if device is not
found or found but inactive; only fail when there's an error with
the link (Manivannan Sadhasivam)
- For controllers like NXP i.MX6QP and i.MX7D, where LTSSM registers
are not accessible after PME_Turn_Off, simply wait 10ms instead of
polling for L2/L3 Ready (Richard Zhu)
- Use multiple iATU entries to map large bridge windows and DMA
ranges when necessary instead of failing (Samuel Holland)
- Add EPC dynamic_inbound_mapping feature bit for Endpoint
Controllers that can update BAR inbound address translation without
requiring EPF driver to clear/reset the BAR first, and advertise it
for DWC-based Endpoints (Koichiro Den)
- Add EPC subrange_mapping feature bit for Endpoint Controllers that
can map multiple independent inbound regions in a single BAR,
implement subrange mapping, advertise it for DWC-based Endpoints,
and add Endpoint selftests for it (Koichiro Den)
- Make resizable BARs work for Endpoint multi-PF configurations;
previously it only worked for PF 0 (Aksh Garg)
- Fix Endpoint non-PF 0 support for BAR configuration, ATU mappings,
and Address Match Mode (Aksh Garg)
- Set up iATU when ECAM is enabled; previously IO and MEM outbound
windows weren't programmed, and ECAM-related iATU entries weren't
restored after suspend/resume, so config accesses failed (Krishna
Chaitanya Chundru)
Miscellaneous:
- Use system_percpu_wq and WQ_PERCPU to explicitly request per-CPU
work so WQ_UNBOUND can eventually be removed (Marco Crivellari)"
* tag 'pci-v7.0-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci: (176 commits)
PCI/bwctrl: Disable BW controller on Intel P45 using a quirk
PCI: Disable ACS SV for IDT 0x8090 switch
PCI: Disable ACS SV for IDT 0x80b5 switch
PCI: Cache ACS Capabilities register
PCI: Enable ACS after configuring IOMMU for OF platforms
PCI: Add ACS quirk for Pericom PI7C9X2G404 switches [12d8:b404]
PCI: Add ACS quirk for Qualcomm Hamoa & Glymur
PCI: Use device_lock_assert() to verify device lock is held
PCI: Use lockdep_assert_held(pci_bus_sem) to verify lock is held
PCI: Fix pci_slot_lock () device locking
PCI: Fix pci_slot_trylock() error handling
PCI: Mark Nvidia GB10 to avoid bus reset
PCI: Mark ASM1164 SATA controller to avoid bus reset
PCI: host-generic: Avoid reporting incorrect 'missing reg property' error
PCI/PME: Replace RMW of Root Status register with direct write
PCI/AER: Clear stale errors on reporting agents upon probe
PCI: Don't claim disabled bridge windows
PCI: rzg3s-host: Fix device node reference leak in rzg3s_pcie_host_parse_port()
PCI: dwc: Fix missing iATU setup when ECAM is enabled
PCI: dwc: Clean up iATU index usage in dw_pcie_iatu_setup()
...
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Aaron Tomlin
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6a80838814 |
tracing: Add show_event_triggers to expose active event triggers
To audit active event triggers, userspace currently must traverse the events/ directory and read each individual trigger file. This is cumbersome for system-wide auditing or debugging. Introduce "show_event_triggers" at the trace root directory. This file displays all events that currently have one or more triggers applied, alongside the trigger configuration, in a consolidated system:event [tab] trigger format. The implementation leverages the existing trace_event_file iterators and uses the trigger's own print() operation to ensure output consistency with the per-event trigger files. Link: https://patch.msgid.link/20260105142939.2655342-3-atomlin@atomlin.com Signed-off-by: Aaron Tomlin <atomlin@atomlin.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> |
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Aaron Tomlin
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729757b96a |
tracing: Add show_event_filters to expose active event filters
Currently, to audit active Ftrace event filters, userspace must recursively traverse the events/ directory and read each individual filter file. This is inefficient for monitoring tools and debugging. Introduce "show_event_filters" at the trace root directory. This file displays all events that currently have a filter applied, alongside the actual filter string, in a consolidated system:event [tab] filter format. The implementation reuses the existing trace_event_file iterators to ensure atomic traversal of the event list and utilises guard(rcu)() for automatic, scope-based protection when accessing volatile filter strings. Link: https://patch.msgid.link/20260105142939.2655342-2-atomlin@atomlin.com Signed-off-by: Aaron Tomlin <atomlin@atomlin.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> |
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Aaron Tomlin
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2cddfc2e8f |
tracing: Add bitmask-list option for human-readable bitmask display
Add support for displaying bitmasks in human-readable list format (e.g., 0,2-5,7) in addition to the default hexadecimal bitmap representation. This is particularly useful when tracing CPU masks and other large bitmasks where individual bit positions are more meaningful than their hexadecimal encoding. When the "bitmask-list" option is enabled, the printk "%*pbl" format specifier is used to render bitmasks as comma-separated ranges, making trace output easier to interpret for complex CPU configurations and large bitmask values. Link: https://patch.msgid.link/20251226160724.2246493-2-atomlin@atomlin.com Signed-off-by: Aaron Tomlin <atomlin@atomlin.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> |
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Jani Nikula
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a592a36e49 |
Documentation: use a source-read extension for the index link boilerplate
The root document usually has a special :ref:`genindex` link to the generated index. This is also the case for Documentation/index.rst. The other index.rst files deeper in the directory hierarchy usually don't. For SPHINXDIRS builds, the root document isn't Documentation/index.rst, but some other index.rst in the hierarchy. Currently they have a ".. only::" block to add the index link when doing SPHINXDIRS html builds. This is obviously very tedious and repetitive. The link is also added to all index.rst files in the hierarchy for SPHINXDIRS builds, not just the root document. Put the boilerplate in a sphinx-includes/subproject-index.rst file, and include it at the end of the root document for subproject builds in an ad-hoc source-read extension defined in conf.py. For now, keep having the boilerplate in translations, because this approach currently doesn't cover translated index link headers. Cc: Jonathan Corbet <corbet@lwn.net> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Tested-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> [jc: did s/doctree/kern_doc_dir/ ] Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260123143149.2024303-1-jani.nikula@intel.com> |
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Petr Vorel
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a02857e734 |
Documentation/trace: Fix links to other documents
Link to another document does not require 'file:'. Removing it fixes links in generated html docs. Signed-off-by: Petr Vorel <pvorel@suse.cz> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260111223643.174812-2-pvorel@suse.cz> |
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Gabriele Monaco
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e4a1e415eb |
Documentation/rv: Adapt documentation after da_monitor refactoring
Previous changes refactored the da_monitor header file to avoid using macros. This implies a few changes in how to import and use da_monitor helpers: DECLARE_DA_MON_<TYPE>(name, type) is substituted by #define RV_MON_TYPE RV_MON_<TYPE> da_handle_event_<name>() is substituted by da_handle_event() Update the documentation to reflect the changes. Reviewed-by: Nam Cao <namcao@linutronix.de> Link: https://lore.kernel.org/r/20251126104241.291258-4-gmonaco@redhat.com Signed-off-by: Gabriele Monaco <gmonaco@redhat.com> |
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Shuai Xue
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8236fc613d |
Documentation: tracing: Add PCI tracepoint documentation
The PCI tracing system provides tracepoints to monitor critical hardware events that can impact system performance and reliability. Add documentation about it. Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com> [bhelgaas: squash fixes: https://lore.kernel.org/r/20260108013956.14351-2-bagasdotme@gmail.com https://lore.kernel.org/r/20260108013956.14351-3-bagasdotme@gmail.com] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://patch.msgid.link/20251210132907.58799-4-xueshuai@linux.alibaba.com |
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Soham Metha
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7508b208f1 |
Documentation/rv: Fix dead link to monitor_synthesis.rst
The file 'da_monitor_synthesis.rst' was renamed to 'monitor_synthesis.rst' in commit |
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James Clark
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19214ad0a4 |
coresight: docs: Document etm4x timestamp interval option
Document how the new field is used, maximum value and the interaction with SYNC timestamps. Tested-by: Leo Yan <leo.yan@arm.com> Signed-off-by: James Clark <james.clark@linaro.org> Reviewed-by: Leo Yan <leo.yan@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20251128-james-cs-syncfreq-v8-13-4d319764cc58@linaro.org |
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Linus Torvalds
|
69c5079b49 |
Merge tag 'trace-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull tracing updates from Steven Rostedt:
- Extend tracing option mask to 64 bits
The trace options were defined by a 32 bit variable. This limits the
tracing instances to have a total of 32 different options. As that
limit has been hit, and more options are being added, increase the
option mask to a 64 bit number, doubling the number of options
available.
As this is required for the kprobe topic branches as well as the
tracing topic branch, a separate branch was created and merged into
both.
- Make trace_user_fault_read() available for the rest of tracing
The function trace_user_fault_read() is used by trace_marker file
read to allow reading user space to be done fast and without locking
or allocations. Make this available so that the system call trace
events can use it too.
- Have system call trace events read user space values
Now that the system call trace events callbacks are called in a
faultable context, take advantage of this and read the user space
buffers for various system calls. For example, show the path name of
the openat system call instead of just showing the pointer to that
path name in user space. Also show the contents of the buffer of the
write system call. Several system call trace events are updated to
make tracing into a light weight strace tool for all applications in
the system.
- Update perf system call tracing to do the same
- And a config and syscall_user_buf_size file to control the size of
the buffer
Limit the amount of data that can be read from user space. The
default size is 63 bytes but that can be expanded to 165 bytes.
- Allow the persistent ring buffer to print system calls normally
The persistent ring buffer prints trace events by their type and
ignores the print_fmt. This is because the print_fmt may change from
kernel to kernel. As the system call output is fixed by the system
call ABI itself, there's no reason to limit that. This makes reading
the system call events in the persistent ring buffer much nicer and
easier to understand.
- Add options to show text offset to function profiler
The function profiler that counts the number of times a function is
hit currently lists all functions by its name and offset. But this
becomes ambiguous when there are several functions with the same
name.
Add a tracing option that changes the output to be that of
'_text+offset' instead. Now a user space tool can use this
information to map the '_text+offset' to the unique function it is
counting.
- Report bad dynamic event command
If a bad command is passed to the dynamic_events file, report it
properly in the error log.
- Clean up tracer options
Clean up the tracer option code a bit, by removing some useless code
and also using switch statements instead of a series of if
statements.
- Have tracing options be instance specific
Tracers can have their own options (function tracer, irqsoff tracer,
function graph tracer, etc). But now that the same tracer can be
enabled in multiple trace instances, their options are still global.
The API is per instance, thus changing one affects other instances.
This isn't even consistent, as the option take affect differently
depending on when an tracer started in an instance. Make the options
for instances only affect the instance it is changed under.
- Optimize pid_list lock contention
Whenever the pid_list is read, it uses a spin lock. This happens at
every sched switch. Taking the lock at sched switch can be removed by
instead using a seqlock counter.
- Clean up the trace trigger structures
The trigger code uses two different structures to implement a single
tigger. This was due to trying to reuse code for the two different
types of triggers (always on trigger, and count limited trigger). But
by adding a single field to one structure, the other structure could
be absorbed into the first structure making he code easier to
understand.
- Create a bulk garbage collector for trace triggers
If user space has triggers for several hundreds of events and then
removes them, it can take several seconds to complete. This is
because each removal calls tracepoint_synchronize_unregister() that
can take hundreds of milliseconds to complete.
Instead, create a helper thread that will do the clean up. When a
trigger is removed, it will create the kthread if it isn't already
created, and then add the trigger to a llist. The kthread will take
the items off the llist, call tracepoint_synchronize_unregister(),
and then remove the items it took off. It will then check if there's
more items to free before sleeping.
This makes user space removing all these triggers to finish in less
than a second.
- Allow function tracing of some of the tracing infrastructure code
Because the tracing code can cause recursion issues if it is traced
by the function tracer the entire tracing directory disables function
tracing. But not all of tracing causes issues if it is traced.
Namely, the event tracing code. Add a config that enables some of the
tracing code to be traced to help in debugging it. Note, when this is
enabled, it does add noise to general function tracing, especially if
events are enabled as well (which is a common case).
- Add boot-time backup instance for persistent buffer
The persistent ring buffer is used mostly for kernel crash analysis
in the field. One issue is that if there's a crash, the data in the
persistent ring buffer must be read before tracing can begin using
it. This slows down the boot process. Once tracing starts in the
persistent ring buffer, the old data must be freed and the addresses
no longer match and old events can't be in the buffer with new
events.
Create a way to create a backup buffer that copies the persistent
ring buffer at boot up. Then after a crash, the always on tracer can
begin immediately as well as the normal boot process while the crash
analysis tooling uses the backup buffer. After the backup buffer is
finished being read, it can be removed.
- Enable function graph args and return address options at the same
time
Currently the when reading of arguments in the function graph tracer
is enabled, the option to record the parent function in the entry
event can not be enabled. Update the code so that it can.
- Add new struct_offset() helper macro
Add a new macro that takes a pointer to a structure and a name of one
of its members and it will return the offset of that member. This
allows the ring buffer code to simplify the following:
From: size = struct_size(entry, buf, cnt - sizeof(entry->id));
To: size = struct_offset(entry, id) + cnt;
There should be other simplifications that this macro can help out
with as well
* tag 'trace-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (42 commits)
overflow: Introduce struct_offset() to get offset of member
function_graph: Enable funcgraph-args and funcgraph-retaddr to work simultaneously
tracing: Add boot-time backup of persistent ring buffer
ftrace: Allow tracing of some of the tracing code
tracing: Use strim() in trigger_process_regex() instead of skip_spaces()
tracing: Add bulk garbage collection of freeing event_trigger_data
tracing: Remove unneeded event_mutex lock in event_trigger_regex_release()
tracing: Merge struct event_trigger_ops into struct event_command
tracing: Remove get_trigger_ops() and add count_func() from trigger ops
tracing: Show the tracer options in boot-time created instance
ftrace: Avoid redundant initialization in register_ftrace_direct
tracing: Remove unused variable in tracing_trace_options_show()
fgraph: Make fgraph_no_sleep_time signed
tracing: Convert function graph set_flags() to use a switch() statement
tracing: Have function graph tracer option sleep-time be per instance
tracing: Move graph-time out of function graph options
tracing: Have function graph tracer option funcgraph-irqs be per instance
trace/pid_list: optimize pid_list->lock contention
tracing: Have function graph tracer define options per instance
tracing: Have function tracer define options per instance
...
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Tomas Glozar
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b9f6a40dc3 |
Documentation/trace: Specify exact priority for timerlat
The timerlat tracer documentation mentions that threads are created with real-time priority, but does not mention which priority and scheduling class is used. Add the information so that users do not have to look it up in trace_osnoise.c. Signed-off-by: Tomas Glozar <tglozar@redhat.com> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20251010083338.478961-9-tglozar@redhat.com> |
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Steven Rostedt
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299ea67e6a |
tracing: Add a config and syscall_user_buf_size file to limit amount written
When a system call that can copy user space addresses into the ring buffer, it can copy up to 511 bytes of data. This can waste precious ring buffer space if the user isn't interested in the output. Add a new file "syscall_user_buf_size" that gets initialized to a new config CONFIG_SYSCALL_BUF_SIZE_DEFAULT that defaults to 63. The config also is used to limit how much perf can read from user space. Also lower the max down to 165, as this isn't to record everything that a system call may be passing through to the kernel. 165 is more than enough. The reason for 165 is because adding one for the nul terminating byte, as well as possibly needing to append the "..." string turns it into 170 bytes. As this needs to save up to 3 arguments and 3 * 170 is 510 which fits nicely in 512 bytes (a power of 2). Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Takaya Saeki <takayas@google.com> Cc: Tom Zanussi <zanussi@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ian Rogers <irogers@google.com> Cc: Douglas Raillard <douglas.raillard@arm.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ingo Molnar <mingo@redhat.com> Link: https://lore.kernel.org/20251028231148.260068913@kernel.org Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> |
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Bagas Sanjaya
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b8874ea3d0 |
Documentation: trace: histogram: Convert ftrace docs cross-reference
In brief "Extended error information" section, details on error condition is referred to ftrace docs, which is written in :file: directive instead of a proper cross-reference. Convert it. Reviewed-by: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20250916054202.582074-7-bagasdotme@gmail.com> |
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Bagas Sanjaya
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fa06220f34 |
Documentation: trace: histogram-design: Wrap introductory note in note:: directive
Use Sphinx note:: directive for the introductory note at the beginning of docs, instead of aligned-text paragraph that renders as definition list. Reviewed-by: Tom Zanussi <zanussi@kernel.org> Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20250916054202.582074-6-bagasdotme@gmail.com> |
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Bagas Sanjaya
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8c716e87ea |
Documentation: trace: historgram-design: Separate sched_waking histogram section heading and the following diagram
Section heading for sched_waking histogram is shown as normal paragraph
instead due to codeblock marker for the following diagram being in the
same line as the section underline. Separate them.
Fixes:
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Bagas Sanjaya
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f867a298ac |
Documentation: trace: histogram-design: Trim trailing vertices in diagram explanation text
Diagram explanation text is supposed to be interleaved commentary between diagram parts that are spread out, but it outputs ugly in htmldocs due to trailing vertices as if both the explanation and the diagram are in the same literal code block. Trim trailing vertices. Reviewed-by: Tom Zanussi <zanussi@kernel.org> Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20250916054202.582074-4-bagasdotme@gmail.com> |
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Bagas Sanjaya
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348b7ca8d3 |
Documentation: trace: histogram: Fix histogram trigger subsection number order
Section numbering in subsections of "Histogram Trigger Command" sections
is inconsistent in order. In particular, "'hist' trigger examples" is
erroneously numbered as 6.2, which is a leftover from
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Ryan Chung
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b65988af71 |
tracing: fix grammar error in debugging.rst
Signed-off-by: Ryan Chung <seokwoo.chung130@gmail.com> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20250831101736.11519-3-seokwoo.chung130@gmail.com |
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Ryan Chung
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d5958c8a09 |
tracing: rephrase for clearer documentation
Signed-off-by: Ryan Chung <seokwoo.chung130@gmail.com> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20250831101736.11519-2-seokwoo.chung130@gmail.com |
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Mehdi Ben Hadj Khelifa
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915fb5caad |
docs: Corrected typo in trace/events
-Changed 'Dyamically' to 'Dynamically' in trace/events.rst under sections 7.1 and 7.3 Signed-off-by: Mehdi Ben Hadj Khelifa <mehdi.benhadjkhelifa@gmail.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20250819085040.974388-1-mehdi.benhadjkhelifa@gmail.com |
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Jonathan Corbet
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4e18a0b090 |
Merge branch 'bjorn' into docs-mw
A big set of typo fixes from Bjorn Helgaas |
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Bjorn Helgaas
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29fe206065 |
Documentation: Fix trace typos
Fix typos. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20250813200526.290420-9-helgaas@kernel.org |
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Gopi Krishna Menon
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70d476b63a |
Documentation/rv: Fix minor typo in monitor_synthesis page
Specifically, fix spelling of "practice" Signed-off-by: Gopi Krishna Menon <krishnagopi487@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20250810111249.93181-1-krishnagopi487@gmail.com |