Re: sched: tweak select_idle_sibling to look for idle threads

From	Mike Galbraith <mgalbraith@suse.de>
Newsgroups	linux.kernel
Subject	Re: sched: tweak select_idle_sibling to look for idle threads
Date	2016-05-10 09:50 +0200
Message-ID	<rxaAz-6l0-51@gated-at.bofh.it> (permalink)
References	(6 earlier) <rwKG6-4Ch-1@gated-at.bofh.it> <rwO71-yr-43@gated-at.bofh.it> <rwPcK-1Kc-19@gated-at.bofh.it> <rwPPs-2FZ-27@gated-at.bofh.it> <rx9XQ-5Zf-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Tue, 2016-05-10 at 07:26 +0800, Yuyang Du wrote:

> By cpu reservation, you mean the various averages in select_task_rq_fair?
> It does seem a lot of cleanup should be done.

Nah, I meant claiming an idle cpu with cmpxchg().  It's mostly the
average load business that leads to premature stacking though, the
reservation thingy more or less just wastes cycles.  Only whacking
cfs_rq_runnable_load_avg() with a rock makes schbench -m <sockets> -t
<near socket size> -a work well.  'Course a rock in its gearbox also
rendered load balancing fairly busted for the general case :)

	-Mike

Thread

Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-04-30 14:50 +0200
  Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-01 09:20 +0200
    Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-01 11:00 +0200
      Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-01 11:30 +0200
        Re: sched: tweak select_idle_sibling to look for idle threads Yuyang Du <yuyang.du@intel.com> - 2016-05-07 11:10 +0200
          Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-08 10:10 +0200
            Re: sched: tweak select_idle_sibling to look for idle threads Yuyang Du <yuyang.du@intel.com> - 2016-05-09 04:40 +0200
              Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-09 05:50 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Yuyang Du <yuyang.du@intel.com> - 2016-05-09 06:10 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-09 09:50 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Yuyang Du <yuyang.du@intel.com> - 2016-05-09 11:00 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-09 11:40 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Yuyang Du <yuyang.du@intel.com> - 2016-05-10 09:10 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-10 09:50 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-05-10 17:30 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Yuyang Du <yuyang.du@intel.com> - 2016-05-11 05:00 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-05-11 06:20 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Yuyang Du <yuyang.du@intel.com> - 2016-05-11 11:10 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-05-11 12:00 +0200
              Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-09 06:00 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Yuyang Du <yuyang.du@intel.com> - 2016-05-09 06:20 +0200
    Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-02 10:50 +0200
      Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-02 17:00 +0200
        Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-02 17:00 +0200
          Re: sched: tweak select_idle_sibling to look for idle threads Chris Mason <clm@fb.com> - 2016-05-02 17:50 +0200
            Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-03 16:40 +0200
              Re: sched: tweak select_idle_sibling to look for idle threads Chris Mason <clm@fb.com> - 2016-05-03 17:20 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-04 12:40 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-04 17:40 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Matt Fleming <matt@codeblueprint.co.uk> - 2016-05-06 00:10 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-06 21:00 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-09 10:40 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-09 11:00 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-04 17:50 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Chris Mason <clm@fb.com> - 2016-05-04 19:50 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-05 11:40 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Chris Mason <clm@fb.com> - 2016-05-05 16:00 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-06 09:20 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Chris Mason <clm@fb.com> - 2016-05-06 19:30 +0200
                Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-06 09:30 +0200
          Re: sched: tweak select_idle_sibling to look for idle threads Mike Galbraith <mgalbraith@suse.de> - 2016-05-02 19:40 +0200
        Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-02 17:10 +0200
          Re: sched: tweak select_idle_sibling to look for idle threads Ingo Molnar <mingo@kernel.org> - 2016-05-02 18:10 +0200
            Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-03 13:40 +0200
              Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-03 20:30 +0200
        Re: sched: tweak select_idle_sibling to look for idle threads Peter Zijlstra <peterz@infradead.org> - 2016-05-02 17:20 +0200

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