linux-kernel - Re: [PATCH 2/5] sched: add WF_CURRENT

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Message-ID: <714DD165-E237-4599-9EE8-477B01AB4365@kernel.org>
Date:   Wed, 19 Oct 2022 21:54:15 -0700
From:   Kees Cook <kees@...nel.org>
To:     Andrei Vagin <avagin@...il.com>, linux-kernel@...r.kernel.org
CC:     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 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/ ?

>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...


-- 
Kees Cook