From: Matt Fleming <matt@codeblueprint.co.uk>
To: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Yuyang Du <yuyang.du@intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Mel Gorman <mgorman@techsingularity.net>
Subject: Re: [rfc patch] sched/fair: Use instantaneous load for fork/exec balancing
Date: Tue, 12 Jul 2016 12:14:08 +0100 [thread overview]
Message-ID: <20160712111408.GT8415@codeblueprint.co.uk> (raw)
In-Reply-To: <57835FCC.70205@arm.com>
On Mon, 11 Jul, at 09:58:52AM, Dietmar Eggemann wrote:
> This difference in the initial se->avg.load_avg value [0 or 1024] has an
> influence in wake_affine() [weight = p->se.avg.load_avg;] for the wakeup
> handling of the hackbench tasks in the 'send/receive data' phase.
The way I was running hackbench made it very susceptible to changes in
fork behaviour, i.e. running it with a small number of loops.
> There are a couple of patches on tip/sched/core which might change the
> behaviour of this: fork path, no double attach_entity_load_avg for new
> task, no remove_entity_load_avg for new task, changes in effective_load ...
Indeed they do! Things are much improved when running the latest
tip/sched/core, thanks for the pointer.
next prev parent reply other threads:[~2016-07-12 11:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-14 7:58 [rfc patch] sched/fair: Use instantaneous load for fork/exec balancing Mike Galbraith
2016-06-14 14:14 ` Dietmar Eggemann
2016-06-14 16:40 ` Mike Galbraith
2016-06-15 15:32 ` Dietmar Eggemann
2016-06-15 16:03 ` Mike Galbraith
2016-06-15 19:03 ` Dietmar Eggemann
2016-06-16 3:33 ` Mike Galbraith
2016-06-16 9:01 ` Dietmar Eggemann
2016-07-04 15:04 ` Matt Fleming
2016-07-04 17:43 ` Mike Galbraith
2016-07-06 11:45 ` Matt Fleming
2016-07-06 12:21 ` Mike Galbraith
2016-07-11 8:58 ` Dietmar Eggemann
2016-07-12 11:14 ` Matt Fleming [this message]
2016-06-14 22:42 ` Yuyang Du
2016-06-15 7:01 ` Mike Galbraith
2016-06-16 11:46 ` [patch] sched/fair: Use instantaneous load in wakeup paths Mike Galbraith
2016-06-16 12:04 ` Mike Galbraith
2016-06-16 12:41 ` Mike Galbraith
2016-06-17 6:21 ` Mike Galbraith
2016-06-17 10:55 ` Dietmar Eggemann
2016-06-17 13:57 ` Mike Galbraith
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