linux-kernel - Re: [PATCH v2 2/3] sched/fair: Move hot load

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Date:	Thu, 03 Dec 2015 05:32:28 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Waiman Long <Waiman.Long@....com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Yuyang Du <yuyang.du@...el.com>,
	Paul Turner <pjt@...gle.com>, Ben Segall <bsegall@...gle.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>
Subject: Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own
 cacheline

On Wed, 2015-12-02 at 13:41 -0500, Waiman Long wrote:

> By doing so, the perf profile became:
> 
>    9.44%   0.00%  java   [kernel.vmlinux]  [k] smp_apic_timer_interrupt
>    8.74%   0.01%  java   [kernel.vmlinux]  [k] hrtimer_interrupt
>    7.83%   0.03%  java   [kernel.vmlinux]  [k] tick_sched_timer
>    7.74%   0.00%  java   [kernel.vmlinux]  [k] update_process_times
>    7.27%   0.03%  java   [kernel.vmlinux]  [k] scheduler_tick
>    5.94%   1.74%  java   [kernel.vmlinux]  [k] task_tick_fair
>    4.15%   3.92%  java   [kernel.vmlinux]  [k] update_cfs_shares
> 
> The %cpu time is still pretty high, but it is better than before.

Is that with the box booted skew_tick=1?

	-Mike

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