mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Julia Lawall <julia.lawall@inria.fr>
To: Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Mel Gorman <mgorman@suse.de>,
	linux-kernel@vger.kernel.org
Subject: find_new_ilb
Date: Tue, 8 Jun 2021 21:51:30 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.22.394.2106082138350.16734@hadrien> (raw)

Starting from the following commit:

commit 45da7a2b0af8fa29dff2e6ba8926322068350fce
Author: Peter Zijlstra <peterz@infradead.org>
Date:   Tue Aug 18 10:48:17 2020 +0200

    sched/fair: Exclude the current CPU from find_new_ilb()

up through Linux 5.12, I observed that often when most of the machine was
idle, there could be many (thousands) of sched_wake_idle_without_ipi
events, typically between cores 0 and 1.  I don't see this any more in
Linux v5.13-rc1.  I looked through the patches to fair.c and core.c
subsequent to v5.12, and I didn't see anything that explicitly addresses
this issue.  Before I plunge into another set of rounds of bisecting, I
wonder if anyone knows whether and how this problem was resolved?

thanks,
julia

             reply	other threads:[~2021-06-08 19:51 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-08 19:51 Julia Lawall [this message]
2021-06-09  7:12 ` find_new_ilb Peter Zijlstra
2021-06-09  7:18   ` find_new_ilb Vincent Guittot
2021-06-09  7:26     ` find_new_ilb Julia Lawall
2021-06-09 13:04     ` find_new_ilb Julia Lawall
2021-06-09  7:26   ` find_new_ilb Julia Lawall

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=alpine.DEB.2.22.394.2106082138350.16734@hadrien \
    --to=julia.lawall@inria.fr \
    --cc=dietmar.eggemann@arm.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mgorman@suse.de \
    --cc=mingo@redhat.com \
    --cc=peterz@infradead.org \
    --cc=vincent.guittot@linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®