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linux/kernel/sched
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Peter Zijlstra 0abec32a68 sched/hrtick: Mark hrtick timer LAZY_REARM 
The hrtick timer is frequently rearmed before expiry and most of the time
the new expiry is past the armed one. As this happens on every context
switch it becomes expensive with scheduling heavy work loads especially in
virtual machines as the "hardware" reprogamming implies a VM exit.

hrtimer now provide a lazy rearm mode flag which skips the reprogamming if:

    1) The timer was the first expiring timer before the rearm

    2) The new expiry time is farther out than the armed time

This avoids a massive amount of reprogramming operations of the hrtick
timer for the price of eventually taking the alredy armed interrupt for
nothing.

Mark the hrtick timer accordingly.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260224163429.475409346@kernel.org
2026-02-27 16:40:06 +01:00
..
autogroup.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
autogroup.h sched: Clean up and standardize #if/#else/#endif markers in sched/autogroup.[ch] 2025-06-13 08:47:14 +02:00
build_policy.c sched_ext: Move internal type and accessor definitions to ext_internal.h 2025-09-03 11:33:28 -10:00
build_utility.c sched/smp: Make SMP unconditional 2025-06-13 08:47:18 +02:00
clock.c sched/clock: Avoid false sharing for sched_clock_irqtime 2026-02-03 12:04:19 +01:00
completion.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
core_sched.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
core.c sched/hrtick: Mark hrtick timer LAZY_REARM 2026-02-27 16:40:06 +01:00
cpuacct.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpudeadline.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpudeadline.h sched/deadline: only set free_cpus for online runqueues 2025-10-16 11:13:49 +02:00
cpufreq_schedutil.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpufreq.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpupri.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpupri.h sched/smp: Make SMP unconditional 2025-06-13 08:47:18 +02:00
cputime.c - A nice cleanup to the paravirt code containing a unification of the paravirt 2026-02-10 19:01:45 -08:00
deadline.c sched: Avoid ktime_get() indirection 2026-02-27 16:40:04 +01:00
debug.c sched/debug: Fix dl_server (re)start conditions 2026-02-03 12:04:18 +01:00
ext_idle.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
ext_idle.h sched_ext: Always use SMP versions in kernel/sched/ext_idle.h 2025-06-13 14:47:59 -10:00
ext_internal.h sched_ext: Implement load balancer for bypass mode 2025-11-12 06:43:44 -10:00
ext.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
ext.h sched_ext: Use cgroup_lock/unlock() to synchronize against cgroup operations 2025-09-03 11:36:07 -10:00
fair.c sched/fair: Make hrtick resched hard 2026-02-27 16:40:04 +01:00
features.h sched/fair: Disable scheduler feature NEXT_BUDDY 2026-01-23 11:53:19 +01:00
idle.c sched_ext: Add a DL server for sched_ext tasks 2026-02-03 12:04:17 +01:00
isolation.c kthread: Honour kthreads preferred affinity after cpuset changes 2026-02-03 15:23:35 +01:00
loadavg.c Merge branch 'tip/sched/urgent' 2025-07-14 17:16:28 +02:00
Makefile sched: Enable context analysis for core.c and fair.c 2026-01-05 16:43:36 +01:00
membarrier.c rseq: Simplify the event notification 2025-11-04 08:30:09 +01:00
pelt.c treewide: Update email address 2026-01-11 06:09:11 -10:00
pelt.h sched/fair: Switch to task based throttle model 2025-09-03 10:03:14 +02:00
psi.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
rq-offsets.c sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
rt.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
sched-pelt.h sched: Make clangd usable 2025-06-11 11:20:53 +02:00
sched.h sched: Optimize hrtimer handling 2026-02-27 16:40:05 +01:00
smp.h sched: Make clangd usable 2025-06-11 11:20:53 +02:00
stats.c sched/smp: Use the SMP version of schedstats 2025-06-13 08:47:21 +02:00
stats.h delayacct: add timestamp of delay max 2026-01-31 16:16:06 -08:00
stop_task.c sched/core: Rework sched_class::wakeup_preempt() and rq_modified_*() 2025-12-17 10:53:25 +01:00
swait.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
syscalls.c sched: Deadline has dynamic priority 2026-01-15 21:57:53 +01:00
topology.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
wait_bit.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
wait.c ARM: 2025-07-30 17:14:01 -07:00