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Message-ID: <Y1HsWddXgnYNH0aa@gmail.com>
Date: Thu, 20 Oct 2022 17:48:25 -0700
From: Andrei Vagin <avagin@...il.com>
To: Kees Cook <kees@...nel.org>
Cc: linux-kernel@...r.kernel.org,
Andy Lutomirski <luto@...capital.net>,
Christian Brauner <brauner@...nel.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Kees Cook <keescook@...omium.org>,
Ingo Molnar <mingo@...hat.com>,
Juri Lelli <juri.lelli@...hat.com>,
Peter Oskolkov <posk@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Tycho Andersen <tycho@...ho.pizza>,
Will Drewry <wad@...omium.org>,
Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH 2/5] sched: add WF_CURRENT_CPU and externise ttwu
On Wed, Oct 19, 2022 at 09:54:15PM -0700, Kees Cook wrote:
> On October 19, 2022 6:10:45 PM PDT, Andrei Vagin <avagin@...il.com> wrote:
> >From: Peter Oskolkov <posk@...gle.com>
> >
> >Add WF_CURRENT_CPU wake flag that advices the scheduler to
> >move the wakee to the current CPU. This is useful for fast on-CPU
> >context switching use cases such as UMCG.
>
> UMCG is https://lwn.net/Articles/879398/ ?
>
Yes, this is it. https://lkml.org/lkml/2021/11/4/830 is the most recent
version that I've seen.
> >In addition, make ttwu external rather than static so that
> >the flag could be passed to it from outside of sched/core.c.
> >
> >Signed-off-by: Peter Oskolkov <posk@...gle.com>
> >Signed-off-by: Andrei Vagin <avagin@...il.com>
> >---
> > kernel/sched/core.c | 3 +--
> > kernel/sched/fair.c | 4 ++++
> > kernel/sched/sched.h | 13 ++++++++-----
> > 3 files changed, 13 insertions(+), 7 deletions(-)
>
> This would need an Ack from the sched maintainers...
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