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Groups > linux.kernel > #1712511

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 2017-08-16 01:00 +0200
Message-ID <ueSYx-7mo-13@gated-at.bofh.it> (permalink)
References (3 earlier) <ueAff-3Y4-1@gated-at.bofh.it> <ueAyC-4lc-3@gated-at.bofh.it> <ueAIi-4oo-5@gated-at.bofh.it> <ueSOR-7jm-7@gated-at.bofh.it> <ueSYx-7mo-15@gated-at.bofh.it>
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On Tue, Aug 15, 2017 at 3:56 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> Except they really don't actually work for this case, exactly because
> they also simplify away "minor" details like exclusive vs
> non-exclusive etc.
>
> The page wait-queue very much has a mix of "wake all" and "wake one" semantics.

Oh, and the page wait-queue really needs that key argument too, which
is another thing that swait queue code got rid of in the name of
simplicity.

So no. The swait code is absolutely _entirely_ the wrong thing to use.

                 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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