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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

From Tejun Heo <tj@kernel.org>
Newsgroups linux.kernel
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
Date 2017-05-25 16:40 +0200
Message-ID <tL25I-WE-17@gated-at.bofh.it> (permalink)
References <tFg1I-45Y-19@gated-at.bofh.it> <tKOcp-pv-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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

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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 Tim Chen <tim.c.chen@linux.intel.com> - 2017-05-25 01:50 +0200
  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 Tejun Heo <tj@kernel.org> - 2017-05-25 16:40 +0200
    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 Tim Chen <tim.c.chen@linux.intel.com> - 2017-05-27 03:30 +0200

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