linux-kernel - Re: [PATCH] sched/fair: Fix pelt lost idle time detection

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Message-ID: <CAKfTPtAzWihxuZARiVq6wMp4B2Dbv7fBgkQ1yn+SXTD=Hp6umQ@mail.gmail.com>
Date: Wed, 21 Jan 2026 11:14:22 +0100
From: Vincent Guittot <vincent.guittot@...aro.org>
To: Samuel Wu <wusamuel@...gle.com>
Cc: Alex Hoh (賀振坤) <Alex.Hoh@...iatek.com>, 
	"bsegall@...gle.com" <bsegall@...gle.com>, "vschneid@...hat.com" <vschneid@...hat.com>, 
	"dietmar.eggemann@....com" <dietmar.eggemann@....com>, "rostedt@...dmis.org" <rostedt@...dmis.org>, 
	"peterz@...radead.org" <peterz@...radead.org>, "mingo@...hat.com" <mingo@...hat.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "mgorman@...e.de" <mgorman@...e.de>, 
	"juri.lelli@...hat.com" <juri.lelli@...hat.com>, "kernel-team@...roid.com" <kernel-team@...roid.com>
Subject: Re: [PATCH] sched/fair: Fix pelt lost idle time detection

On Wed, 21 Jan 2026 at 02:19, Samuel Wu <wusamuel@...gle.com> wrote:
>
> On Tue, Jan 20, 2026 at 12:36 AM Vincent Guittot
> <vincent.guittot@...aro.org> wrote:
> >
> > On Tue, 20 Jan 2026 at 06:46, Alex Hoh (賀振坤) <Alex.Hoh@...iatek.com> wrote:
> > >
> > > On Fri, 2026-01-16 at 17:13 +0100, Vincent Guittot wrote:
> > > > Le vendredi 16 janv. 2026 à 15:21:35 (+0100), Vincent Guittot a écrit
> > > > :
> > > > > Hi Alex,
> >
> > [..]
> >
> > >
> > > This fix looks good to me, and in my local testing,
> > > RT utilization dropped significantly from 72 to 20.
> >
> > Thanks for your tests. Let see if this fixes Samuel's regression too
> > and I will prepare a patch
> >
>
> Thanks Vincent- fix also looks good to me, with RT util and power both
> dropped significantly and within baseline levels.
>
> For completeness, here is Perfetto trace with this latest fix:
> https://ui.perfetto.dev/#!/?s=f82243599e7a3e590ab91a1b3a7e15e3c17f481d
>
> Feel free to add these tags as appropriate:
> Reported-by: Samuel Wu <wusamuel@...gle.com>
> Tested-by: Samuel Wu <wusamuel@...gle.com>

Thanks.