This is a note to let you know that I've just added the patch titled
s390/vtime: fix average steal time calculation
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-vtime-fix-average-steal-time-calculation.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 06050b8c15f4762fe7905a99dbfacf576d65c920
Author: Mete Durlu <meted@xxxxxxxxxxxxx>
Date: Wed Mar 6 12:31:52 2024 +0100
s390/vtime: fix average steal time calculation
[ Upstream commit 367c50f78451d3bd7ad70bc5c89f9ba6dec46ca9 ]
Current average steal timer calculation produces volatile and inflated
values. The only user of this value is KVM so far and it uses that to
decide whether or not to yield the vCPU which is seeing steal time.
KVM compares average steal timer to a threshold and if the threshold
is past then it does not allow CPU polling and yields it to host, else
it keeps the CPU by polling.
Since KVM's steal time threshold is very low by default (%10) it most
likely is not effected much by the bloated average steal timer values
because the operating region is pretty small. However there might be
new users in the future who might rely on this number. Fix average
steal timer calculation by changing the formula from:
avg_steal_timer = avg_steal_timer / 2 + steal_timer;
to the following:
avg_steal_timer = (avg_steal_timer + steal_timer) / 2;
This ensures that avg_steal_timer is actually a naive average of steal
timer values. It now closely follows steal timer values but of course
in a smoother manner.
Fixes: 152e9b8676c6 ("s390/vtime: steal time exponential moving average")
Signed-off-by: Mete Durlu <meted@xxxxxxxxxxxxx>
Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index e0a88dcaf5cb7..24a18e5ef6e8e 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -210,13 +210,13 @@ void vtime_flush(struct task_struct *tsk)
virt_timer_expire();
steal = S390_lowcore.steal_timer;
- avg_steal = S390_lowcore.avg_steal_timer / 2;
+ avg_steal = S390_lowcore.avg_steal_timer;
if ((s64) steal > 0) {
S390_lowcore.steal_timer = 0;
account_steal_time(cputime_to_nsecs(steal));
avg_steal += steal;
}
- S390_lowcore.avg_steal_timer = avg_steal;
+ S390_lowcore.avg_steal_timer = avg_steal / 2;
}
static u64 vtime_delta(void)
