From: Peter Zijlstra <peterz@infradead.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
LAK <linux-arm-kernel@lists.infradead.org>,
Preeti U Murthy <preeti@linux.vnet.ibm.com>,
Morten Rasmussen <Morten.Rasmussen@arm.com>,
Mike Galbraith <efault@gmx.de>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
"linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>
Subject: Re: [PATCH v3 08/12] sched: move cfs task on a CPU with higher capacity
Date: Mon, 14 Jul 2014 15:51:06 +0200 [thread overview]
Message-ID: <20140714135106.GZ19379@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CAKfTPtCdd6uR_qBuW2W4asMgEV=OfsNvrOCVQCci+w3C8RAoCQ@mail.gmail.com>
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On Fri, Jul 11, 2014 at 05:17:44PM +0200, Vincent Guittot wrote:
> > In any case, its feels rather arbitrary to me. What about machines where
> > there's no cache sharing at all (the traditional SMP systems). This
> > thing you're trying to do still seems to make sense there.
>
> ok, I thought that traditional SMP systems have this flag set at core
> level.
Yeah, with 1 core, so its effectively disabled.
> I mean ARM platforms have the flag for CPUs in the same cluster
> (which include current ARM SMP system) and the corei7 of my laptop has
> the flag at the cores level.
So I can see 'small' parts reducing shared caches in order to improve
idle performance.
The point being that LLC seems a somewhat arbitrary measure for this.
Can we try and see what happens if you remove the limit. Its always best
to try the simpler things first and only make it more complex if we have
to.
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next prev parent reply other threads:[~2014-07-14 13:51 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-30 16:05 [PATCH v3 00/12] sched: consolidation of cpu_power Vincent Guittot
2014-06-30 16:05 ` [PATCH v3 01/12] sched: fix imbalance flag reset Vincent Guittot
2014-07-08 3:13 ` Preeti U Murthy
2014-07-08 10:12 ` Vincent Guittot
2014-07-09 3:54 ` Preeti U Murthy
2014-07-09 8:27 ` Vincent Guittot
2014-07-09 10:43 ` Peter Zijlstra
2014-07-09 11:41 ` Preeti U Murthy
2014-07-09 14:44 ` Peter Zijlstra
2014-07-10 9:14 ` Vincent Guittot
2014-07-10 9:30 ` [PATCH v4 ] " Vincent Guittot
2014-07-10 10:57 ` Preeti U Murthy
2014-07-10 11:04 ` [PATCH v3 01/12] " Preeti U Murthy
2014-07-09 3:05 ` Rik van Riel
2014-07-09 3:36 ` Rik van Riel
2014-07-09 10:14 ` Peter Zijlstra
2014-07-09 10:30 ` Vincent Guittot
2014-06-30 16:05 ` [PATCH v3 02/12] sched: remove a wake_affine condition Vincent Guittot
2014-07-09 3:06 ` Rik van Riel
2014-06-30 16:05 ` [PATCH v3 03/12] sched: fix avg_load computation Vincent Guittot
2014-07-09 3:10 ` Rik van Riel
2014-06-30 16:05 ` [PATCH v3 04/12] sched: Allow all archs to set the power_orig Vincent Guittot
2014-07-09 3:11 ` Rik van Riel
2014-07-09 10:57 ` Peter Zijlstra
2014-07-10 13:42 ` Vincent Guittot
2014-06-30 16:05 ` [PATCH v3 05/12] ARM: topology: use new cpu_power interface Vincent Guittot
2014-07-09 3:11 ` Rik van Riel
2014-07-09 7:49 ` Amit Kucheria
2014-07-09 10:09 ` Vincent Guittot
2014-06-30 16:05 ` [PATCH v3 06/12] sched: add per rq cpu_power_orig Vincent Guittot
2014-07-09 3:11 ` Rik van Riel
2014-07-09 7:50 ` Amit Kucheria
2014-06-30 16:05 ` [PATCH v3 07/12] sched: test the cpu's capacity in wake affine Vincent Guittot
2014-07-09 3:12 ` Rik van Riel
2014-07-10 11:06 ` Peter Zijlstra
2014-07-10 13:58 ` Vincent Guittot
2014-06-30 16:05 ` [PATCH v3 08/12] sched: move cfs task on a CPU with higher capacity Vincent Guittot
2014-07-10 11:18 ` Peter Zijlstra
2014-07-10 14:03 ` Vincent Guittot
2014-07-11 14:51 ` Peter Zijlstra
2014-07-11 15:17 ` Vincent Guittot
2014-07-14 13:51 ` Peter Zijlstra [this message]
2014-07-15 9:21 ` Vincent Guittot
2014-07-10 11:24 ` Peter Zijlstra
2014-07-10 13:59 ` Vincent Guittot
2014-07-10 11:31 ` Peter Zijlstra
2014-06-30 16:05 ` [PATCH v3 09/12] Revert "sched: Put rq's sched_avg under CONFIG_FAIR_GROUP_SCHED" Vincent Guittot
2014-07-10 13:16 ` Peter Zijlstra
2014-07-11 7:51 ` Vincent Guittot
2014-07-11 15:13 ` Peter Zijlstra
2014-07-11 17:39 ` Vincent Guittot
2014-07-11 20:12 ` Peter Zijlstra
2014-07-14 12:55 ` Morten Rasmussen
2014-07-14 13:20 ` Peter Zijlstra
2014-07-14 14:04 ` Morten Rasmussen
2014-07-14 16:22 ` Peter Zijlstra
2014-07-15 9:20 ` Vincent Guittot
2014-07-14 17:54 ` Dietmar Eggemann
2014-07-18 1:27 ` Yuyang Du
2014-07-11 16:13 ` Morten Rasmussen
2014-07-15 9:27 ` Vincent Guittot
2014-07-15 9:32 ` Morten Rasmussen
2014-07-15 9:53 ` Vincent Guittot
2014-06-30 16:05 ` [PATCH v3 10/12] sched: get CPU's utilization statistic Vincent Guittot
2014-06-30 16:05 ` [PATCH v3 11/12] sched: replace capacity_factor by utilization Vincent Guittot
2014-06-30 16:05 ` [PATCH v3 12/12] sched: add SD_PREFER_SIBLING for SMT level Vincent Guittot
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