Groups > linux.kernel > #1204324

Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency mask model

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency mask model
Date	2015-08-10 16:30 +0200
Message-ID	<pVWfo-uE-17@gated-at.bofh.it> (permalink)
References	(4 earlier) <pTrps-W6-95@gated-at.bofh.it> <pTrSq-1uf-13@gated-at.bofh.it> <pTF90-41P-11@gated-at.bofh.it> <pVVW1-7v-3@gated-at.bofh.it> <pVW5I-iZ-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, Aug 10, 2015 at 04:16:58PM +0200, Frederic Weisbecker wrote:

> I considered many times relying on hrtick btw but everyone seem to say it has a lot
> of overhead, especially due to clock reprogramming on schedule() calls.

Yeah, I have some vague ideas of how to take out much of that overhead
(tglx will launch frozen sharks at me I suspect), but we cannot get
around the overhead of actually having to program the hardware and that
is still a significant amount on many machines.

Supposedly machines with TSC deadline are better, but I've not tried
to benchmark that.
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Thread

Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency  mask model Juri Lelli <juri.lelli@arm.com> - 2015-08-10 16:10 +0200
  Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency  mask model Frederic Weisbecker <fweisbec@gmail.com> - 2015-08-10 16:20 +0200
    Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency  mask model Peter Zijlstra <peterz@infradead.org> - 2015-08-10 16:30 +0200
      Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency  mask model Peter Zijlstra <peterz@infradead.org> - 2015-08-10 17:20 +0200
        Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency  mask model Frederic Weisbecker <fweisbec@gmail.com> - 2015-08-10 17:30 +0200
          Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency  mask model Juri Lelli <juri.lelli@arm.com> - 2015-08-10 17:50 +0200
          Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency  mask model Peter Zijlstra <peterz@infradead.org> - 2015-08-10 18:50 +0200
    Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency  mask model Christoph Lameter <cl@linux.com> - 2015-08-10 17:40 +0200

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