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d4f7dae87096dfe722bf32aa82076ece1063746c
linux/kernel
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Frederic Weisbecker d4f7dae870 timers: Spare timer softirq until next expiry 
Now that the core timer infrastructure doesn't depend anymore on
periodic base->clk increments, even when the CPU is not in NO_HZ mode,
timer softirqs can be skipped until there are timers to expire.

Some spurious softirqs can still remain since base->next_expiry doesn't
keep track of canceled timers but this still reduces the number of softirqs
significantly: ~15 times less for HZ=1000 and ~5 times less for HZ=100.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://lkml.kernel.org/r/20200717140551.29076-11-frederic@kernel.org
2020-07-17 21:55:24 +02:00
..
bpf
bpf: Don't return EINVAL from {get,set}sockopt when optlen > PAGE_SIZE
2020-06-17 10:54:05 -07:00
cgroup
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
configs
…
debug
kgdb: Avoid suspicious RCU usage warning
2020-06-26 15:41:40 +01:00
dma
dma-remap: align the size in dma_common_*_remap()
2020-06-23 14:14:41 +02:00
events
Merge branch 'akpm' (patches from Andrew)
2020-06-09 09:54:46 -07:00
gcov
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
irq
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
kcsan
kcsan: Support distinguishing volatile accesses
2020-06-11 20:04:01 +02:00
livepatch
livepatch: Make klp_apply_object_relocs static
2020-05-11 00:31:38 +02:00
locking
Merge tag 'x86-entry-2020-06-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-06-13 10:05:47 -07:00
power
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
printk
Revert "kernel/printk: add kmsg SEEK_CUR handling"
2020-06-21 20:47:20 -07:00
rcu
Merge tag 'core-urgent-2020-07-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-07-05 12:21:28 -07:00
sched
Merge tag 'sched_urgent_for_5.8_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-06-28 10:37:39 -07:00
time
timers: Spare timer softirq until next expiry
2020-07-17 21:55:24 +02:00
trace
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-06-25 18:27:40 -07:00
.gitignore
…
acct.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
async.c
…
audit_fsnotify.c
…
audit_tree.c
…
audit_watch.c
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audit.c
Merge tag 'audit-pr-20200601' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2020-06-02 17:13:37 -07:00
audit.h
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auditfilter.c
…
auditsc.c
audit: add subj creds to NETFILTER_CFG record to
2020-05-20 18:09:19 -04:00
backtracetest.c
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bounds.c
…
capability.c
…
compat.c
…
configs.c
…
context_tracking.c
context_tracking: Ensure that the critical path cannot be instrumented
2020-06-11 15:14:36 +02:00
cpu_pm.c
kernel/cpu_pm: Fix uninitted local in cpu_pm
2020-05-15 11:44:34 -07:00
cpu.c
Merge tag 'sched-core-2020-06-02' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-06-03 13:06:42 -07:00
crash_core.c
…
crash_dump.c
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cred.c
exec: Teach prepare_exec_creds how exec treats uids & gids
2020-05-20 14:44:21 -05:00
delayacct.c
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dma.c
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elfcore.c
…
exec_domain.c
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exit.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
extable.c
…
fail_function.c
…
fork.c
fork: annotate data race in copy_process()
2020-06-26 01:05:29 +02:00
freezer.c
…
futex.c
mmap locking API: use coccinelle to convert mmap_sem rwsem call sites
2020-06-09 09:39:14 -07:00
gen_kheaders.sh
kbuild: add variables for compression tools
2020-06-06 23:42:01 +09:00
groups.c
mm: remove the pgprot argument to __vmalloc
2020-06-02 10:59:11 -07:00
hung_task.c
kernel/hung_task.c: introduce sysctl to print all traces when a hung task is detected
2020-06-08 11:05:56 -07:00
iomem.c
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irq_work.c
irq_work, smp: Allow irq_work on call_single_queue
2020-05-28 10:54:15 +02:00
jump_label.c
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kallsyms.c
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kcmp.c
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Kconfig.freezer
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Kconfig.hz
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Kconfig.locks
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Kconfig.preempt
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kcov.c
kcov: check kcov_softirq in kcov_remote_stop()
2020-06-10 19:14:17 -07:00
kexec_core.c
…
kexec_elf.c
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kexec_file.c
kexec: do not verify the signature without the lockdown or mandatory signature
2020-06-26 00:27:36 -07:00
kexec_internal.h
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kexec.c
…
kheaders.c
…
kmod.c
…
kprobes.c
kretprobe: Prevent triggering kretprobe from within kprobe_flush_task
2020-06-16 21:21:01 -04:00
ksysfs.c
…
kthread.c
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
2020-06-17 10:57:41 -07:00
latencytop.c
…
Makefile
Merge tag 'notifications-20200601' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
2020-06-13 09:56:21 -07:00
module_signature.c
…
module_signing.c
…
module-internal.h
…
module.c
vmalloc: fix the owner argument for the new __vmalloc_node_range callers
2020-07-03 16:15:25 -07:00
notifier.c
mm: remove vmalloc_sync_(un)mappings()
2020-06-02 10:59:12 -07:00
nsproxy.c
nsproxy: restore EINVAL for non-namespace file descriptor
2020-06-17 00:33:12 +02:00
padata.c
padata: upgrade smp_mb__after_atomic to smp_mb in padata_do_serial
2020-06-18 17:09:54 +10:00
panic.c
bug: Annotate WARN/BUG/stackfail as noinstr safe
2020-06-11 15:14:36 +02:00
params.c
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pid_namespace.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-06-03 16:27:18 -07:00
pid.c
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profile.c
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ptrace.c
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range.c
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reboot.c
printk: Collapse shutdown types into a single dump reason
2020-05-30 10:34:03 -07:00
relay.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
resource.c
/dev/mem: Revoke mappings when a driver claims the region
2020-05-27 11:10:05 +02:00
rseq.c
…
scs.c
scs: Report SCS usage in bytes rather than number of entries
2020-06-04 16:14:56 +01:00
seccomp.c
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signal.c
task_work: teach task_work_add() to do signal_wake_up()
2020-06-30 12:18:08 -06:00
smp.c
smp, irq_work: Continue smp_call_function*() and irq_work*() integration
2020-06-28 17:01:20 +02:00
smpboot.c
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smpboot.h
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softirq.c
x86/entry: Clarify irq_{enter,exit}_rcu()
2020-06-11 15:15:24 +02:00
stackleak.c
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stacktrace.c
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stop_machine.c
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sys_ni.c
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sys.c
Merge tag 'LSM-add-setgid-hook-5.8-author-fix' of git://github.com/micah-morton/linux
2020-06-14 11:39:31 -07:00
sysctl_binary.c
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sysctl-test.c
…
sysctl.c
kernel/sysctl.c: ignore out-of-range taint bits introduced via kernel.tainted
2020-06-08 11:05:56 -07:00
task_work.c
task_work: teach task_work_add() to do signal_wake_up()
2020-06-30 12:18:08 -06:00
taskstats.c
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test_kprobes.c
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torture.c
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tracepoint.c
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tsacct.c
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ucount.c
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uid16.c
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uid16.h
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umh.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-05-15 13:48:59 -07:00
up.c
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user_namespace.c
nsproxy: add struct nsset
2020-05-09 13:57:12 +02:00
user-return-notifier.c
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user.c
user.c: make uidhash_table static
2020-06-04 19:06:24 -07:00
utsname_sysctl.c
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utsname.c
nsproxy: add struct nsset
2020-05-09 13:57:12 +02:00
watch_queue.c
Merge tag 'notifications-20200601' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
2020-06-13 09:56:21 -07:00
watchdog_hld.c
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watchdog.c
kernel/watchdog.c: convert {soft/hard}lockup boot parameters to sysctl aliases
2020-06-08 11:05:56 -07:00
workqueue_internal.h
…
workqueue.c
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
2020-06-17 10:57:41 -07:00