Yury Norov [NVIDIA] 8557c8628c clocksource: Improve randomness in clocksource_verify_choose_cpus() ...

The current algorithm of picking a random CPU works OK for dense online
cpumask, but if cpumask is non-dense, the distribution of picked CPUs
is skewed.

For example, on 8-CPU board with CPUs 4-7 offlined, the probability of
selecting CPU 0 is 5/8. Accordingly, cpus 1, 2 and 3 are chosen with
probability 1/8 each. The proper algorithm should pick each online CPU
with probability 1/4.

Switch it to cpumask_random(), which has better statistical
characteristics.

CC: Andrew Morton <akpm@linux-foundation.org>
Acked-by: John Stultz <jstultz@google.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: "Yury Norov [NVIDIA]" <yury.norov@gmail.com>

2025-07-31 11:27:48 -04:00

..

alarmtimer.c

alarmtimer: Switch spin_{lock,unlock}_irqsave() to guards

2025-04-30 09:06:23 +02:00

clockevents.c

clockevents: Shutdown and unregister current clockevents at CPUHP_AP_TICK_DYING

2024-10-31 10:41:42 +01:00

clocksource-wdtest.c

clocksource/wdtest: Print time values for short udelay(1)

2025-01-15 19:49:13 +01:00

clocksource.c

clocksource: Improve randomness in clocksource_verify_choose_cpus()

2025-07-31 11:27:48 -04:00

hrtimer.c

hrtimer: Add missing ACCESS_PRIVATE() for hrtimer::function

2025-04-09 21:00:42 +02:00

itimer.c

signal: Confine POSIX_TIMERS properly

2024-10-29 11:43:18 +01:00

jiffies.c

time/jiffies: Change register_refined_jiffies() to void __init

2025-04-30 09:06:23 +02:00

Kconfig

timekeeping: Always check for negative motion

2024-11-02 10:14:31 +01:00

Makefile

tracing: Disable branch profiling in noinstr code

2025-03-22 09:49:26 +01:00

namespace.c

vdso: Rework struct vdso_time_data and introduce struct vdso_clock

2025-03-08 14:37:41 +01:00

ntp_internal.h

ntp: Make sure RTC is synchronized when time goes backwards

2024-09-10 13:50:40 +02:00

ntp.c

time: Switch to hrtimer_setup()

2025-02-18 10:32:33 +01:00

posix-clock.c

Merge tag 'net-next-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

2025-03-26 21:48:21 -07:00

posix-cpu-timers.c

posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()

2025-06-13 10:55:49 -07:00

posix-stubs.c

posix-timers: Get rid of [COMPAT_]SYS_NI() uses

2023-12-20 21:30:27 -08:00

posix-timers.c

posix-timers: Initialize cache early and move pointer into __timer_data

2025-04-09 21:21:36 +02:00

posix-timers.h

posix-timers: Cleanup SIG_IGN workaround leftovers

2024-11-07 02:14:45 +01:00

sched_clock.c

time: Switch to hrtimer_setup()

2025-02-18 10:32:33 +01:00

sleep_timeout.c

treewide, timers: Rename from_timer() to timer_container_of()

2025-06-08 09:07:37 +02:00

test_udelay.c

time: Add MODULE_DESCRIPTION() to time test modules

2024-06-03 11:18:50 +02:00

tick-broadcast-hrtimer.c

time: Switch to hrtimer_setup()

2025-02-18 10:32:33 +01:00

tick-broadcast.c

tick/broadcast: Add kernel-doc for function parameters

2025-01-15 19:49:14 +01:00

tick-common.c

timekeeping: Add a lockdep override in tick_freeze()

2025-04-09 22:30:39 +02:00

tick-internal.h

clockevents: Shutdown and unregister current clockevents at CPUHP_AP_TICK_DYING

2024-10-31 10:41:42 +01:00

tick-legacy.c

…

tick-oneshot.c

time: Fix various kernel-doc problems

2023-01-03 11:07:58 +01:00

tick-sched.c

time: Switch to hrtimer_setup()

2025-02-18 10:32:33 +01:00

tick-sched.h

tick/sched: Fix struct tick_sched doc warnings

2024-04-01 10:36:35 +02:00

time_test.c

time: Add MODULE_DESCRIPTION() to time test modules

2024-06-03 11:18:50 +02:00

time.c

time: Fix references to _msecs_to_jiffies() handling of values

2024-10-25 19:50:10 +02:00

timeconst.bc

…

timeconv.c

…

timecounter.c

…

timekeeping_debug.c

timekeeping: Add percpu counter for tracking floor swap events

2024-10-10 10:20:46 +02:00

timekeeping_internal.h

clocksource: Make negative motion detection more robust

2024-12-05 16:03:24 +01:00

timekeeping.c

timekeeping: Prevent coarse clocks going backwards

2025-04-28 11:17:29 +02:00

timekeeping.h

…

timer_list.c

hrtimers: Make callback function pointer private

2025-04-05 10:30:17 +02:00

timer_migration.c

timers/migration: Fix off-by-one root mis-connection

2025-02-07 09:02:16 +01:00

timer_migration.h

timer/migration: Fix kernel-doc warnings for union tmigr_state

2025-01-15 19:49:14 +01:00

timer.c

Merge tag 'timers-core-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-05-27 09:04:15 -07:00

vsyscall.c

timekeeping: Prevent coarse clocks going backwards

2025-04-28 11:17:29 +02:00