The following commit has been merged into the timers/urgent branch of tip:

Commit-ID: 9a574ea9069be30b835a3da772c039993c43369b Gitweb: https://git.kernel.org/tip/9a574ea9069be30b835a3da772c039993c43369b Author: Tim Chen tim.c.chen@linux.intel.com AuthorDate: Mon, 22 Jan 2024 15:35:34 -08:00 Committer: Thomas Gleixner tglx@linutronix.de CommitterDate: Thu, 25 Jan 2024 09:52:40 +01:00

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.co... --- kernel/time/tick-sched.c | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index d250167..01fb50c 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -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