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tick/sched: Preserve number of idle sleeps across CPU hotplug events 

Commit 71fee48f ("tick-sched: Fix idle and iowait sleeptime accounting vs
CPU hotplug") preserved total idle sleep time and iowait sleeptime across
CPU hotplug events.

Similar reasoning applies to the number of idle calls and idle sleeps to
get the proper average of sleep time per idle invocation.

Preserve those fields too.

Fixes: 71fee48f ("tick-sched: Fix idle and iowait sleeptime accounting vs CPU hotplug")
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240122233534.3094238-1-tim.c.chen@linux.intel.com
This commit is contained in:
Tim Chen 2024-01-22 15:35:34 -08:00 committed by Thomas Gleixner
parent 6446495535
commit 9a574ea906
1 changed files with 5 additions and 0 deletions
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5
kernel/time/tick-sched.c
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@ -1577,6 +1577,7 @@ void tick_cancel_sched_timer(int cpu)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
ktime_t idle_sleeptime, iowait_sleeptime;
unsigned long idle_calls, idle_sleeps;
# ifdef CONFIG_HIGH_RES_TIMERS
if (ts->sched_timer.base)
@ -1585,9 +1586,13 @@ void tick_cancel_sched_timer(int cpu)
idle_sleeptime = ts->idle_sleeptime;
iowait_sleeptime = ts->iowait_sleeptime;
idle_calls = ts->idle_calls;
idle_sleeps = ts->idle_sleeps;
memset(ts, 0, sizeof(*ts));
ts->idle_sleeptime = idle_sleeptime;
ts->iowait_sleeptime = iowait_sleeptime;
ts->idle_calls = idle_calls;
ts->idle_sleeps = idle_sleeps;
}
#endif