mirror-linux/kernel/time
Thomas Gleixner eddffab828 hrtimer: Keep track of first expiring timer per clock base
Evaluating the next expiry time of all clock bases is cache line expensive
as the expiry time of the first expiring timer is not cached in the base
and requires to access the timer itself, which is definitely in a different
cache line.

It's way more efficient to keep track of the expiry time on enqueue and
dequeue operations as the relevant data is already in the cache at that
point.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260224163431.404839710@kernel.org
2026-02-27 16:40:14 +01:00
..
Kconfig hrtimer: Push reprogramming timers into the interrupt return path 2026-02-27 16:40:14 +01:00
Makefile time: Build generic update_vsyscall() only with generic time vDSO 2025-09-04 11:23:50 +02:00
alarmtimer.c time: Fix spelling mistakes in comments 2025-09-21 10:02:02 +02:00
clockevents.c clockevents: Provide support for clocksource coupled comparators 2026-02-27 16:40:08 +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: Reduce watchdog readout delay limit to prevent false positives 2026-01-21 11:33:11 +01:00
hrtimer.c hrtimer: Keep track of first expiring timer per clock base 2026-02-27 16:40:14 +01:00
itimer.c timers/itimer: Avoid direct access to hrtimer clockbase 2025-09-09 12:27:17 +02:00
jiffies.c sysctl: replace SYSCTL_INT_CONV_CUSTOM macro with functions 2026-01-06 11:27:10 +01:00
namespace.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
ntp.c ntp: Use ktime_get_ntp_seconds() 2025-06-19 14:28:24 +02:00
ntp_internal.h ntp: Rename __do_adjtimex() to ntp_adjtimex() 2025-06-19 14:28:23 +02:00
posix-clock.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
posix-cpu-timers.c hrtimer: Store time as ktime_t in restart block 2025-11-14 16:31:19 +01:00
posix-stubs.c
posix-timers.c compiler-context-analysis: Remove __cond_lock() function-like helper 2026-01-05 16:43:33 +01:00
posix-timers.h timekeeping: Add minimal posix-timers support for auxiliary clocks 2025-06-27 20:13:12 +02:00
sched_clock.c time/sched_clock: Use ACCESS_PRIVATE() to evaluate hrtimer::function 2026-01-13 18:08:57 +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
tick-broadcast-hrtimer.c clockevents: Remove redundant CLOCK_EVT_FEAT_KTIME 2026-02-27 16:40:06 +01:00
tick-broadcast.c treewide: Update email address 2026-01-11 06:09:11 -10:00
tick-common.c treewide: Update email address 2026-01-11 06:09:11 -10:00
tick-internal.h cpufreq: ondemand: Simplify idle cputime granularity test 2026-01-28 22:24:58 +01:00
tick-legacy.c
tick-oneshot.c treewide: Update email address 2026-01-11 06:09:11 -10:00
tick-sched.c tick/sched: Avoid hrtimer_cancel/start() sequence 2026-02-27 16:40:06 +01:00
tick-sched.h
time.c time: export timespec64_add_safe() symbol 2025-09-03 16:51:08 -07:00
time_test.c time/kunit: Document handling of negative years of is_leap() 2026-02-02 12:37:54 +01:00
timeconst.bc
timeconv.c
timecounter.c time/timecounter: Inline timecounter_cyc2time() 2025-12-15 20:16:49 +01:00
timekeeping.c timekeeping: Provide infrastructure for coupled clockevents 2026-02-27 16:40:08 +01:00
timekeeping.h timekeeping: Provide infrastructure for coupled clockevents 2026-02-27 16:40:08 +01:00
timekeeping_debug.c timekeeping: Add percpu counter for tracking floor swap events 2024-10-10 10:20:46 +02:00
timekeeping_internal.h timekeeping: Provide ktime_get_ntp_seconds() 2025-06-19 14:28:23 +02:00
timer.c cpufreq: ondemand: Simplify idle cputime granularity test 2026-01-28 22:24:58 +01:00
timer_list.c hrtimer: Convert state and properties to boolean 2026-02-27 16:40:11 +01:00
timer_migration.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
timer_migration.h timers/migration: Rename 'online' bit to 'available' 2025-11-20 20:17:31 +01:00
vsyscall.c vdso/vsyscall: Avoid slow division loop in auxiliary clock update 2025-09-03 11:55:11 +02:00