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Re: [PATCH v2] sched: let __sched_period() use rq's nr_running

From Mike Galbraith <umgwanakikbuti@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2] sched: let __sched_period() use rq's nr_running
Date 2015-07-13 09:10 +0200
Message-ID <pLG2d-23J-7@gated-at.bofh.it> (permalink)
References <pKBHl-3ui-29@gated-at.bofh.it> <pKGxj-6xX-3@gated-at.bofh.it> <pLApQ-733-3@gated-at.bofh.it>
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On Mon, 2015-07-13 at 09:56 +0900, Byungchul Park wrote:

> and i agree with that it makes latency increase for non-grouped tasks.

It's not only a latency hit for the root group, it's across the board.

I suspect an overloaded group foo/bar/baz would prefer small slices over
a large wait as well. I certainly wouldn't want my root group taking the
potentially huge hits that come with stretching period to accommodate an
arbitrarily overloaded /foo/bar/baz.

	-Mike

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[PATCH v2] sched: let __sched_period() use rq's nr_running byungchul.park@lge.com - 2015-07-10 10:20 +0200
  Re: [PATCH v2] sched: let __sched_period() use rq's nr_running Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-07-13 09:10 +0200
    Re: [PATCH v2] sched: let __sched_period() use rq's nr_running Byungchul Park <byungchul.park@lge.com> - 2015-07-13 10:40 +0200
      Re: [PATCH v2] sched: let __sched_period() use rq's nr_running Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-07-13 12:30 +0200
        Re: [PATCH v2] sched: let __sched_period() use rq's nr_running Byungchul Park <byungchul.park@lge.com> - 2015-07-13 13:20 +0200
          Re: [PATCH v2] sched: let __sched_period() use rq's nr_running Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-07-13 14:40 +0200
  Re: [PATCH v2] sched: let __sched_period() use rq's nr_running Peter Zijlstra <peterz@infradead.org> - 2015-07-13 10:30 +0200
    Re: [PATCH v2] sched: let __sched_period() use rq's nr_running Byungchul Park <byungchul.park@lge.com> - 2015-07-13 11:30 +0200
  Re: [PATCH v2] sched: let __sched_period() use rq's nr_running Byungchul Park <byungchul.park@lge.com> - 2015-07-14 11:30 +0200

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