Peter Zijlstra (Intel) 8ce939a0fa perf: Avoid the read if the count is already updated ...

The event may have been updated in the PMU-specific implementation,
e.g., Intel PEBS counters snapshotting. The common code should not
read and overwrite the value.

The PERF_SAMPLE_READ in the data->sample_type can be used to detect
whether the PMU-specific value is available. If yes, avoid the
pmu->read() in the common code. Add a new flag, skip_read, to track the
case.

Factor out a perf_pmu_read() to clean up the code.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250121152303.3128733-3-kan.liang@linux.intel.com

2025-02-05 10:29:45 +01:00

..

bpf

Merge tag 'constfy-sysctl-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/sysctl/sysctl

2025-01-29 10:35:40 -08:00

cgroup

Merge tag 'drm-next-2025-01-17' of https://gitlab.freedesktop.org/drm/kernel

2025-01-21 16:09:47 -08:00

configs

configs/debug: make sure PROVE_RCU_LIST=y takes effect

2024-10-28 10:21:09 -07:00

debug

kdb: Remove unused flags stack

2025-01-25 08:22:26 +00:00

dma

dma-debug: fix physical address calculation for struct dma_debug_entry

2024-11-28 10:19:16 +01:00

entry

sched: Add TIF_NEED_RESCHED_LAZY infrastructure

2024-11-05 12:55:37 +01:00

events

perf: Avoid the read if the count is already updated

2025-02-05 10:29:45 +01:00

futex

Merge tag 'mm-nonmm-stable-2025-01-24-23-16' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-01-26 17:50:53 -08:00

gcov

gcov: clang: use correct function param names

2025-01-24 22:47:27 -08:00

irq

Merge tag 'irq-core-2025-01-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-01-21 13:51:07 -08:00

kcsan

kcsan: Remove redundant call of kallsyms_lookup_name()

2024-10-14 16:44:56 +02:00

livepatch

livepatch: Add stack_order sysfs attribute

2024-12-09 11:44:03 +01:00

locking

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

module

Merge tag 'kbuild-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2025-01-31 12:07:07 -08:00

power

Merge tag 'pm-6.14-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2025-01-30 15:10:34 -08:00

printk

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

rcu

Merge tag 'mm-stable-2025-01-26-14-59' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-01-26 18:36:23 -08:00

sched

Merge tag 'pm-6.14-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2025-01-30 15:10:34 -08:00

time

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

trace

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

.gitignore

…

acct.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

async.c

…

audit_fsnotify.c

…

audit_tree.c

fsnotify: create a wrapper fsnotify_find_inode_mark()

2024-04-04 16:24:16 +02:00

audit_watch.c

fsnotify: create a wrapper fsnotify_find_inode_mark()

2024-04-04 16:24:16 +02:00

audit.c

audit: Initialize lsmctx to avoid memory allocation error

2025-01-29 20:02:04 -05:00

audit.h

audit: change context data from secid to lsm_prop

2024-10-11 14:34:16 -04:00

auditfilter.c

audit: fix suffixed '/' filename matching

2024-12-05 19:22:38 -05:00

auditsc.c

Merge tag 'lsm-pr-20250121' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm

2025-01-21 20:03:04 -08:00

backtracetest.c

backtracetest: add MODULE_DESCRIPTION()

2024-06-24 22:24:55 -07:00

bounds.c

bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS

2024-04-29 08:29:29 -07:00

capability.c

kernel: remove get_task_comm() and print task comm directly

2025-01-12 20:21:15 -08:00

cfi.c

…

compat.c

…

configs.c

…

context_tracking.c

context_tracking, rcu: Rename rcu_dyntick trace event into rcu_watching

2024-08-15 21:30:43 +05:30

cpu_pm.c

…

cpu.c

Merge tag 'mm-stable-2025-01-26-14-59' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-01-26 18:36:23 -08:00

crash_core.c

kexec/crash: no crash update when kexec in progress

2024-11-05 17:12:27 -08:00

crash_reserve.c

crash: fix crash memory reserve exceed system memory bug

2024-09-01 20:43:30 -07:00

cred.c

cred: remove old {override,revert}_creds() helpers

2024-12-02 11:25:09 +01:00

delayacct.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

dma.c

…

elfcorehdr.c

…

exec_domain.c

…

exit.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

exit.h

…

extable.c

…

fail_function.c

…

fork.c

kernel: be more careful about dup_mmap() failures and uprobe registering

2025-02-01 03:53:25 -08:00

freezer.c

sched/fair: Fix external p->on_rq users

2024-10-14 09:14:35 +02:00

gen_kheaders.sh

Merge tag 'kbuild-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2025-01-31 12:07:07 -08:00

groups.c

…

hung_task.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

iomem.c

…

irq_work.c

kasan: make kasan_record_aux_stack_noalloc() the default behaviour

2025-01-13 22:40:36 -08:00

jump_label.c

jump_label: Fix static_key_slow_dec() yet again

2024-09-10 11:57:27 +02:00

kallsyms_internal.h

kallsyms: get rid of code for absolute kallsyms

2024-07-20 16:33:21 +09:00

kallsyms_selftest.c

kallsyms: Use kthread_run_on_cpu()

2025-01-02 22:12:12 +01:00

kallsyms_selftest.h

…

kallsyms.c

kallsyms: Match symbols exactly with CONFIG_LTO_CLANG

2024-08-15 09:33:35 -07:00

kcmp.c

get rid of ...lookup...fdget_rcu() family

2024-10-07 13:34:41 -04:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.kexec

crash, powerpc: default to CRASH_DUMP=n on PPC_BOOK3S_32

2024-11-14 22:43:48 -08:00

Kconfig.locks

…

Kconfig.preempt

sched: No PREEMPT_RT=y for all{yes,mod}config

2024-11-07 15:25:05 +01:00

kcov.c

kcov: mark in_softirq_really() as __always_inline

2024-12-30 17:59:08 -08:00

kexec_core.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

kexec_elf.c

…

kexec_file.c

kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y

2024-09-01 17:59:01 -07:00

kexec_internal.h

kexec: use atomic_try_cmpxchg_acquire() in kexec_trylock()

2024-09-01 20:43:23 -07:00

kexec.c

crash: add a new kexec flag for hotplug support

2024-04-23 14:59:01 +10:00

kheaders.c

kheaders: Simplify attribute through __BIN_ATTR_SIMPLE_RO()

2024-12-24 09:46:49 +01:00

kprobes.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

ksyms_common.c

…

ksysfs.c

kernel/ksysfs.c: simplify bin_attribute definition

2025-01-07 16:59:15 +01:00

kthread.c

Merge tag 'mm-nonmm-stable-2025-01-24-23-16' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-01-26 17:50:53 -08:00

latencytop.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

Makefile

mm: move kernel/numa.c to mm/

2024-09-03 21:15:26 -07:00

module_signature.c

…

notifier.c

reboot: move reboot_notifier_list to kernel/reboot.c

2024-11-05 17:12:31 -08:00

nsproxy.c

fdget(), trivial conversions

2024-11-03 01:28:06 -05:00

padata.c

padata: avoid UAF for reorder_work

2025-01-19 12:44:28 +08:00

panic.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

params.c

module: Constify 'struct module_attribute'

2025-01-26 13:05:23 +01:00

pid_namespace.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

pid_sysctl.h

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

pid.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

profile.c

profiling: remove profile=sleep support

2024-08-04 13:36:28 -07:00

ptrace.c

…

range.c

…

reboot.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

regset.c

regset: use kvzalloc() for regset_get_alloc()

2024-04-25 21:07:03 -07:00

relay.c

[tree-wide] finally take no_llseek out

2024-09-27 08:18:43 -07:00

resource_kunit.c

resource, kunit: fix user-after-free in resource_test_region_intersects()

2024-10-09 12:47:19 -07:00

resource.c

kernel/resource: simplify API __devm_release_region() implementation

2025-01-12 20:20:58 -08:00

rseq.c

rseq: Fix rseq unregistration regression

2025-01-21 08:10:51 +01:00

scftorture.c

scftorture: Handle NULL argument passed to scf_add_to_free_list().

2024-11-14 16:09:51 -08:00

scs.c

…

seccomp.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

signal.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

smp.c

Merge tag 'csd-lock.2025.01.28a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

2025-01-28 11:34:03 -08:00

smpboot.c

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smpboot.h

…

softirq.c

softirq: Allow raising SCHED_SOFTIRQ from SMP-call-function on RT kernel

2024-12-02 12:01:27 +01:00

stackleak.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

stacktrace.c

…

static_call_inline.c

x86/static-call: provide a way to do very early static-call updates

2024-12-13 09:28:32 +01:00

static_call.c

…

stop_machine.c

stop_machine: Fix rcu_momentary_eqs() call in multi_cpu_stop()

2024-12-11 20:50:47 -08:00

sys_ni.c

Merge tag 'probes-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

2024-07-18 12:19:20 -07:00

sys.c

tracing: Add task_prctl_unknown tracepoint

2024-12-22 20:28:11 -08:00

sysctl-test.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

sysctl.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

task_work.c

kasan: make kasan_record_aux_stack_noalloc() the default behaviour

2025-01-13 22:40:36 -08:00

taskstats.c

fdget(), more trivial conversions

2024-11-03 01:28:06 -05:00

torture.c

torture: Add MODULE_DESCRIPTION()

2024-05-30 15:31:38 -07:00

tracepoint.c

tracing: Fix syscall tracepoint use-after-free

2024-11-01 14:37:31 -04:00

tsacct.c

tsacct: replace strncpy() with strscpy()

2024-07-12 16:39:53 -07:00

ucount.c

ucounts: move kfree() out of critical zone protected by ucounts_lock

2025-01-12 20:21:00 -08:00

uid16.c

…

uid16.h

…

umh.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

up.c

…

user_namespace.c

user_namespace: use kmemdup_array() instead of kmemdup() for multiple allocation

2024-09-09 16:47:42 -07:00

user-return-notifier.c

…

user.c

uidgid: make sure we fit into one cacheline

2024-09-12 12:16:09 +02:00

usermode_driver.c

…

utsname_sysctl.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

utsname.c

…

vhost_task.c

vhost_task: Handle SIGKILL by flushing work and exiting

2024-05-22 08:31:15 -04:00

vmcore_info.c

mm: support only one page_type per page

2024-09-03 21:15:43 -07:00

watch_queue.c

watch_queue: Use page->private instead of page->index

2024-12-22 11:29:51 +01:00

watchdog_buddy.c

…

watchdog_perf.c

watchdog/perf: properly initialize the turbo mode timestamp and rearm counter

2024-07-17 21:11:34 -07:00

watchdog.c

treewide: const qualify ctl_tables where applicable

2025-01-28 13:48:37 +01:00

workqueue_internal.h

…

workqueue.c

Merge tag 'mm-stable-2025-01-26-14-59' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-01-26 18:36:23 -08:00