From: Peter Zijlstra <peterz@infradead.org>
To: Rik van Riel <riel@surriel.com>
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, pjt@google.com,
dietmar.eggemann@arm.com, mingo@redhat.com,
morten.rasmussen@arm.com, tglx@linutronix.de,
mgorman@techsingularity.net, vincent.guittot@linaro.org
Subject: Re: [PATCH 03/14] sched,fair: redefine runnable_load_avg as the sum of task_h_load
Date: Mon, 29 Jul 2019 22:11:32 +0200 [thread overview]
Message-ID: <20190729201132.GS31398@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190722173348.9241-4-riel@surriel.com>
On Mon, Jul 22, 2019 at 01:33:37PM -0400, Rik van Riel wrote:
> The runnable_load magic is used to quickly propagate information about
> runnable tasks up the hierarchy of runqueues. The runnable_load_avg is
> mostly used for the load balancing code, which only examines the value at
> the root cfs_rq.
>
> Redefine the root cfs_rq runnable_load_avg to be the sum of task_h_loads
> of the runnable tasks. This works because the hierarchical runnable_load of
> a task is already equal to the task_se_h_load today. This provides enough
> information to the load balancer.
>
> The runnable_load_avg of the cgroup cfs_rqs does not appear to be
> used for anything, so don't bother calculating those.
>
> This removes one of the things that the code currently traverses the
> cgroup hierarchy for, and getting rid of it brings us one step closer
> to a flat runqueue for the CPU controller.
Nice!
next prev parent reply other threads:[~2019-07-29 20:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-22 17:33 [PATCH RFC v3 0/14] sched,fair: flatten CPU controller runqueues Rik van Riel
2019-07-22 17:33 ` [PATCH 01/14] sched: introduce task_se_h_load helper Rik van Riel
2019-08-12 17:40 ` Dietmar Eggemann
2019-07-22 17:33 ` [PATCH 02/14] sched: change /proc/sched_debug fields Rik van Riel
2019-07-22 17:33 ` [PATCH 03/14] sched,fair: redefine runnable_load_avg as the sum of task_h_load Rik van Riel
2019-07-29 20:05 ` Peter Zijlstra
2019-07-29 21:13 ` Rik van Riel
2019-07-29 20:11 ` Peter Zijlstra [this message]
2019-07-29 20:26 ` Peter Zijlstra
2019-07-22 17:33 ` [PATCH 04/14] sched,fair: move runnable_load_avg to cfs_rq Rik van Riel
2019-07-30 8:55 ` Peter Zijlstra
2019-07-22 17:33 ` [PATCH 06/14] sched,cfs: use explicit cfs_rq of parent se helper Rik van Riel
2019-07-22 17:33 ` [PATCH 07/14] sched,cfs: fix zero length timeslice calculation Rik van Riel
2019-07-22 17:33 ` [PATCH 08/14] sched,fair: simplify timeslice length code Rik van Riel
2019-07-22 17:33 ` [PATCH 09/14] sched,fair: refactor enqueue/dequeue_entity Rik van Riel
2019-07-30 9:36 ` Peter Zijlstra
2019-07-30 12:58 ` Rik van Riel
2019-07-31 9:35 ` Peter Zijlstra
2019-07-31 15:03 ` Rik van Riel
2019-07-31 15:30 ` Peter Zijlstra
2019-07-22 17:33 ` [PATCH 10/14] sched,fair: add helper functions for flattened runqueue Rik van Riel
2019-07-22 17:33 ` [PATCH 11/14] sched,fair: flatten hierarchical runqueues Rik van Riel
2019-07-22 17:33 ` [PATCH 12/14] sched,fair: track cfs_rq->max_h_load for more legitimate h_weight Rik van Riel
2019-07-22 17:33 ` [PATCH 13/14] sched,fair: flatten update_curr functionality Rik van Riel
2019-07-22 17:33 ` [PATCH 14/14] sched,fair: propagate sum_exec_runtime up the hierarchy Rik van Riel
2019-07-30 16:29 ` [PATCH RFC v3 0/14] sched,fair: flatten CPU controller runqueues Peter Zijlstra
2019-07-30 18:27 ` Rik van Riel
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