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Groups > linux.kernel > #1717832

Re: [PATCH 1/2] sched/wait: Break up long wake list walk

From Linus Torvalds <torvalds@linux-foundation.org>
Newsgroups linux.kernel
Subject Re: [PATCH 1/2] sched/wait: Break up long wake list walk
Date 2017-08-22 23:00 +0200
Message-ID <uhorg-7Cb-17@gated-at.bofh.it> (permalink)
References (6 earlier) <uhla1-5tg-1@gated-at.bofh.it> <uhlWp-637-5@gated-at.bofh.it> <uhnvb-6XU-15@gated-at.bofh.it> <uhohz-7x1-17@gated-at.bofh.it> <uhorg-7Cb-19@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, Aug 22, 2017 at 1:53 PM, Peter Zijlstra <peterz@infradead.org> wrote:
>
> So _the_ problem with yield() is when you hit this with a RT task it
> will busy spin and possibly not allow the task that actually has the
> lock to make progress at all.

I thought we had explicitly defined yield() to not do that.

But I guess we could make this yielding behavior depend on a few more
heuristics. So do the yield only when there is contention, and when
it's a non-RT task.

          Linus

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Thread

[PATCH 1/2] sched/wait: Break up long wake list walk Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-15 03:20 +0200
  Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-15 03:50 +0200
    Re: [PATCH 1/2] sched/wait: Break up long wake list walk Andi Kleen <ak@linux.intel.com> - 2017-08-15 04:30 +0200
      Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-15 05:00 +0200
        Re: [PATCH 1/2] sched/wait: Break up long wake list walk Andi Kleen <ak@linux.intel.com> - 2017-08-15 05:20 +0200
          Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-15 05:30 +0200
            Re: [PATCH 1/2] sched/wait: Break up long wake list walk Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-15 21:10 +0200
              Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-15 21:50 +0200
              Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-15 21:50 +0200
            Re: [PATCH 1/2] sched/wait: Break up long wake list walk Davidlohr Bueso <dave@stgolabs.net> - 2017-08-16 00:50 +0200
              Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-16 01:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-16 02:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk ebiederm@xmission.com (Eric W. Biederman) - 2017-08-17 01:30 +0200
              Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-16 01:00 +0200
    RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-17 18:20 +0200
      Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-17 18:30 +0200
        RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-17 22:20 +0200
          Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-17 22:50 +0200
            Re: [PATCH 1/2] sched/wait: Break up long wake list walk Mel Gorman <mgorman@techsingularity.net> - 2017-08-18 14:30 +0200
              RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-18 16:30 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Mel Gorman <mgorman@techsingularity.net> - 2017-08-18 16:50 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-18 18:40 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Andi Kleen <ak@linux.intel.com> - 2017-08-18 18:50 +0200
                RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-18 19:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-18 19:50 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Mel Gorman <mgorman@techsingularity.net> - 2017-08-18 21:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-18 21:20 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Andi Kleen <ak@linux.intel.com> - 2017-08-18 22:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-18 22:20 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Mel Gorman <mgorman@techsingularity.net> - 2017-08-21 20:40 +0200
                RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-21 21:00 +0200
                RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-22 19:30 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-22 20:20 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-22 20:30 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Peter Zijlstra <peterz@infradead.org> - 2017-08-22 21:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-22 21:20 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Peter Zijlstra <peterz@infradead.org> - 2017-08-22 21:10 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Andi Kleen <ak@linux.intel.com> - 2017-08-22 21:40 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Christopher Lameter <cl@linux.com> - 2017-08-22 23:10 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Andi Kleen <ak@linux.intel.com> - 2017-08-22 23:30 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-23 01:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-23 01:20 +0200
                RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-23 17:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-22 21:40 +0200
                RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-22 22:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-22 22:50 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-22 23:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Peter Zijlstra <peterz@infradead.org> - 2017-08-22 23:00 +0200
                RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-23 16:50 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-23 18:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-23 20:20 +0200
                RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-23 23:00 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-24 01:40 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-24 19:50 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-24 20:20 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Mel Gorman <mgorman@techsingularity.net> - 2017-08-24 22:50 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Mel Gorman <mgorman@techsingularity.net> - 2017-08-23 18:10 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Andi Kleen <ak@linux.intel.com> - 2017-08-18 22:10 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-18 22:40 +0200
                RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-18 22:30 +0200
                Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-18 22:40 +0200
              Re: [PATCH 1/2] sched/wait: Break up long wake list walk Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-18 19:00 +0200
            RE: [PATCH 1/2] sched/wait: Break up long wake list walk "Liang, Kan" <kan.liang@intel.com> - 2017-08-18 15:10 +0200

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