Linus Torvalds 944d5fe50f sched/membarrier: reduce the ability to hammer on sys_membarrier ...

On some systems, sys_membarrier can be very expensive, causing overall
slowdowns for everything.  So put a lock on the path in order to
serialize the accesses to prevent the ability for this to be called at
too high of a frequency and saturate the machine.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-and-tested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Fixes: 22e4ebb975 ("membarrier: Provide expedited private command")
Fixes: c5f58bd58f ("membarrier: Provide GLOBAL_EXPEDITED command")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2024-02-20 09:38:05 -08:00

..

autogroup.c

sched/all: Change all BUG_ON() instances in the scheduler to WARN_ON_ONCE()

2022-08-12 11:25:10 +02:00

autogroup.h

sched/headers: Add header guard to kernel/sched/stats.h and kernel/sched/autogroup.h

2022-02-23 08:22:00 +01:00

build_policy.c

sched: Fix missing prototype warnings

2022-05-01 10:03:43 +02:00

build_utility.c

sched/headers: Remove duplicate header inclusions

2023-10-03 21:27:55 +02:00

clock.c

Merge tag 'locking-core-2023-06-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2023-06-27 14:14:30 -07:00

completion.c

sched: add a few helpers to wake up tasks on the current cpu

2023-07-17 16:08:08 -07:00

core_sched.c

sched: Rename task_running() to task_on_cpu()

2022-09-07 21:53:47 +02:00

core.c

Merge tag 'header_cleanup-2024-01-10' of https://evilpiepirate.org/git/bcachefs

2024-01-10 16:43:55 -08:00

cpuacct.c

Merge branch 'sched/fast-headers' into sched/core

2022-03-15 09:05:05 +01:00

cpudeadline.c

sched/topology: Consolidate and clean up access to a CPU's max compute capacity

2023-10-09 12:59:48 +02:00

cpudeadline.h

…

cpufreq_schedutil.c

sched/fair: Fix frequency selection for non-invariant case

2024-01-16 10:41:25 +01:00

cpufreq.c

sched/headers: Introduce kernel/sched/build_utility.c and build multiple .c files there

2022-02-23 10:58:33 +01:00

cpupri.c

sched/rt: Fix live lock between select_fallback_rq() and RT push

2023-09-28 22:58:13 +02:00

cpupri.h

…

cputime.c

cputime: remove cputime_to_nsecs fallback

2022-12-27 12:52:17 +01:00

deadline.c

sched/deadline: Introduce deadline servers

2023-11-15 09:57:51 +01:00

debug.c

sched/fair: Simplify util_est

2023-12-23 15:59:58 +01:00

fair.c

Merge tag 'mm-nonmm-stable-2024-01-09-10-33' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2024-01-09 11:46:20 -08:00

features.h

sched/fair: Remove SCHED_FEAT(UTIL_EST_FASTUP, true)

2023-12-23 15:59:56 +01:00

idle.c

sched/cpuidle: Comment about timers requirements VS idle handler

2023-11-15 09:57:51 +01:00

isolation.c

sched/headers: Introduce kernel/sched/build_utility.c and build multiple .c files there

2022-02-23 10:58:33 +01:00

loadavg.c

sched/headers: Introduce kernel/sched/build_utility.c and build multiple .c files there

2022-02-23 10:58:33 +01:00

Makefile

sched/headers: Introduce kernel/sched/build_policy.c and build multiple .c files there

2022-02-23 10:58:33 +01:00

membarrier.c

sched/membarrier: reduce the ability to hammer on sys_membarrier

2024-02-20 09:38:05 -08:00

pelt.c

sched: Make PELT acronym definition searchable

2023-10-13 09:56:30 +02:00

pelt.h

sched/fair: Simplify util_est

2023-12-23 15:59:58 +01:00

psi.c

sched/psi: Update poll => rtpoll in relevant comments

2023-10-16 13:42:49 +02:00

rt.c

sched: Unify runtime accounting across classes

2023-11-15 09:57:48 +01:00

sched-pelt.h

…

sched.h

Merge tag 'mm-nonmm-stable-2024-01-09-10-33' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2024-01-09 11:46:20 -08:00

smp.h

sched, smp: Trace smp callback causing an IPI

2023-03-24 11:01:29 +01:00

stats.c

sched/headers: Introduce kernel/sched/build_utility.c and build multiple .c files there

2022-02-23 10:58:33 +01:00

stats.h

sched/psi: Use task->psi_flags to clear in CPU migration

2022-10-30 10:12:15 +01:00

stop_task.c

sched: Unify runtime accounting across classes

2023-11-15 09:57:48 +01:00

swait.c

sched: add a few helpers to wake up tasks on the current cpu

2023-07-17 16:08:08 -07:00

topology.c

sched/fair: Scan cluster before scanning LLC in wake-up path

2023-10-24 10:38:43 +02:00

wait_bit.c

wait_on_bit: add an acquire memory barrier

2022-08-26 09:30:25 -07:00

wait.c

sched: remove wait bookmarks

2023-10-18 14:34:18 -07:00