* v6.12 backport for psi: Fix race when task wakes up before psi_sched_switch() adjusts flags
@ 2025-02-04 15:31 Paul Kramme
2025-02-04 17:25 ` Greg KH
2025-02-04 19:48 ` Sasha Levin
0 siblings, 2 replies; 3+ messages in thread
From: Paul Kramme @ 2025-02-04 15:31 UTC (permalink / raw)
To: stable; +Cc: chengming.zhou, Bendix Bartsch
Hello,
we are seeing broken CPU PSI metrics across our infrastructure running
6.12, with messages like "psi: inconsistent task state!
task=1831:hackbench cpu=8 psi_flags=14 clear=0 set=4" in dmesg. I
believe commit 7d9da040575b343085287686fa902a5b2d43c7ca might fix this
issue.
psi: Fix race when task wakes up before psi_sched_switch() adjusts flags
Thanks
Paul
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: v6.12 backport for psi: Fix race when task wakes up before psi_sched_switch() adjusts flags
2025-02-04 15:31 v6.12 backport for psi: Fix race when task wakes up before psi_sched_switch() adjusts flags Paul Kramme
@ 2025-02-04 17:25 ` Greg KH
2025-02-04 19:48 ` Sasha Levin
1 sibling, 0 replies; 3+ messages in thread
From: Greg KH @ 2025-02-04 17:25 UTC (permalink / raw)
To: Paul Kramme; +Cc: stable, chengming.zhou, Bendix Bartsch
On Tue, Feb 04, 2025 at 04:31:44PM +0100, Paul Kramme wrote:
> Hello,
>
> we are seeing broken CPU PSI metrics across our infrastructure running
> 6.12, with messages like "psi: inconsistent task state!
> task=1831:hackbench cpu=8 psi_flags=14 clear=0 set=4" in dmesg. I
> believe commit 7d9da040575b343085287686fa902a5b2d43c7ca might fix this
> issue.
>
> psi: Fix race when task wakes up before psi_sched_switch() adjusts flags
It is already queued up for the next 6.12.y release.
thanks,
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: v6.12 backport for psi: Fix race when task wakes up before psi_sched_switch() adjusts flags
2025-02-04 15:31 v6.12 backport for psi: Fix race when task wakes up before psi_sched_switch() adjusts flags Paul Kramme
2025-02-04 17:25 ` Greg KH
@ 2025-02-04 19:48 ` Sasha Levin
1 sibling, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2025-02-04 19:48 UTC (permalink / raw)
To: Paul Kramme; +Cc: stable, chengming.zhou, Bendix Bartsch
On Tue, Feb 04, 2025 at 04:31:44PM +0100, Paul Kramme wrote:
>Hello,
>
>we are seeing broken CPU PSI metrics across our infrastructure running
>6.12, with messages like "psi: inconsistent task state!
>task=1831:hackbench cpu=8 psi_flags=14 clear=0 set=4" in dmesg. I
>believe commit 7d9da040575b343085287686fa902a5b2d43c7ca might fix this
>issue.
>
>psi: Fix race when task wakes up before psi_sched_switch() adjusts flags
Hey Paul,
The commit you've mentioned is already queued up, so it should be there
when the next release happens.
--
Thanks,
Sasha
^ permalink raw reply [flat|nested] 3+ messages in thread
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2025-02-04 15:31 v6.12 backport for psi: Fix race when task wakes up before psi_sched_switch() adjusts flags Paul Kramme
2025-02-04 17:25 ` Greg KH
2025-02-04 19:48 ` Sasha Levin
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