linux-kernel - Re: [PATCH v2 for-4.12-fixes 1/2] sched/fair: Use task_groups instead of leaf_cfs_rq_list to walk all cfs

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Date:   Thu, 25 May 2017 10:39:01 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Mike Galbraith <efault@....de>, Paul Turner <pjt@...gle.com>,
        Chris Mason <clm@...com>, kernel-team@...com,
        mohini.narkhede@...el.com
Subject: Re: [PATCH v2 for-4.12-fixes 1/2] sched/fair: Use task_groups
 instead of leaf_cfs_rq_list to walk all cfs_rqs

On Wed, May 24, 2017 at 04:40:34PM -0700, Tim Chen wrote:
> We did some preliminary testing of this patchset for a well
> known database benchmark on a 4 socket Skylake server system.
> It provides a 3.7% throughput boost which is significant for
> this benchmark.

That's great to hear.  Yeah, the walk can be noticeably expensive even
with moderate number of cgroups.  Thanks for sharing the result.

-- 
tejun