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From: Andrei Vagin <avagin@gmail.com>
To: Kees Cook <kees@kernel.org>
Cc: linux-kernel@vger.kernel.org,
	Andy Lutomirski <luto@amacapital.net>,
	Christian Brauner <brauner@kernel.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Kees Cook <keescook@chromium.org>, Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Peter Oskolkov <posk@google.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Tycho Andersen <tycho@tycho.pizza>,
	Will Drewry <wad@chromium.org>,
	Vincent Guittot <vincent.guittot@linaro.org>
Subject: Re: [PATCH 2/5] sched: add WF_CURRENT_CPU and externise ttwu
Date: Thu, 20 Oct 2022 17:48:25 -0700	[thread overview]
Message-ID: <Y1HsWddXgnYNH0aa@gmail.com> (raw)
In-Reply-To: <714DD165-E237-4599-9EE8-477B01AB4365@kernel.org>

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@gmail.com> wrote:
> >From: Peter Oskolkov <posk@google.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@google.com>
> >Signed-off-by: Andrei Vagin <avagin@gmail.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...

  reply	other threads:[~2022-10-21  0:48 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-20  1:10 [PATCH 0/5 v2] seccomp: add the synchronous mode for seccomp_unotify Andrei Vagin
2022-10-20  1:10 ` [PATCH 1/5] seccomp: don't use semaphore and wait_queue together Andrei Vagin
2022-10-20  5:10   ` Kees Cook
2022-10-21  4:30     ` Andrei Vagin
2022-10-20  1:10 ` [PATCH 2/5] sched: add WF_CURRENT_CPU and externise ttwu Andrei Vagin
2022-10-20  4:54   ` Kees Cook
2022-10-21  0:48     ` Andrei Vagin [this message]
2022-10-20  1:10 ` [PATCH 3/5] sched: add a few helpers to wake up tasks on the current cpu Andrei Vagin
2022-10-20 14:15   ` Peter Zijlstra
2022-10-21  0:44     ` Andrei Vagin
2022-10-27  6:51       ` Andrei Vagin
2022-10-20  1:10 ` [PATCH 4/5] seccomp: add the synchronous mode for seccomp_unotify Andrei Vagin
2022-10-20  1:10 ` [PATCH 5/5] selftest/seccomp: add a new test for the sync mode of seccomp_user_notify Andrei Vagin
2022-10-20  5:04   ` Kees Cook
2022-10-21  0:53     ` Andrei Vagin
2022-11-11  7:31 [PATCH 0/5 v3] seccomp: add the synchronous mode for seccomp_unotify Andrei Vagin
2022-11-11  7:31 ` [PATCH 2/5] sched: add WF_CURRENT_CPU and externise ttwu Andrei Vagin
2023-01-10 21:30 [PATCH 0/5 v3 RESEND] seccomp: add the synchronous mode for seccomp_unotify Andrei Vagin
2023-01-10 21:30 ` [PATCH 2/5] sched: add WF_CURRENT_CPU and externise ttwu Andrei Vagin
2023-01-12  7:35   ` Chen Yu
2023-01-13 21:39     ` Andrei Vagin
2023-01-14 15:59       ` Chen Yu
2023-01-18  6:10         ` Andrei Vagin

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