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Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline

From Mike Galbraith <umgwanakikbuti@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline
Date 2015-12-03 05:40 +0100
Message-ID <qBtQu-6V-9@gated-at.bofh.it> (permalink)
References <qBkDv-2x9-3@gated-at.bofh.it> <qBkDw-2x9-23@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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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[PATCH v2 0/3] sched/fair: Reduce contention on tg's load_avg Waiman Long <Waiman.Long@hpe.com> - 2015-12-02 19:50 +0100
  [PATCH v2 1/3] sched/fair: Avoid redundant idle_cpu() call in update_sg_lb_stats() Waiman Long <Waiman.Long@hpe.com> - 2015-12-02 19:50 +0100
  [PATCH v2 3/3] sched/fair: Disable tg load_avg update for root_task_group Waiman Long <Waiman.Long@hpe.com> - 2015-12-02 19:50 +0100
    Re: [PATCH v2 3/3] sched/fair: Disable tg load_avg update for root_task_group bsegall@google.com - 2015-12-02 21:00 +0100
    [tip:sched/core] sched/fair:   Disable the task group load_avg update for the root_task_group tip-bot for Waiman Long <tipbot@zytor.com> - 2015-12-04 13:00 +0100
  [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline Waiman Long <Waiman.Long@hpe.com> - 2015-12-02 19:50 +0100
    Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline bsegall@google.com - 2015-12-02 21:10 +0100
      Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline Waiman Long <waiman.long@hpe.com> - 2015-12-03 20:30 +0100
        Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline bsegall@google.com - 2015-12-03 20:50 +0100
    Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own  cacheline Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-12-03 05:40 +0100
      Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline Waiman Long <waiman.long@hpe.com> - 2015-12-03 20:40 +0100
        Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own  cacheline Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-12-04 03:10 +0100
          Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline Waiman Long <waiman.long@hpe.com> - 2015-12-04 21:20 +0100
    Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own  cacheline Peter Zijlstra <peterz@infradead.org> - 2015-12-03 12:00 +0100
      Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline Waiman Long <waiman.long@hpe.com> - 2015-12-03 20:40 +0100
    Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own  cacheline Peter Zijlstra <peterz@infradead.org> - 2015-12-03 12:20 +0100
      Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline bsegall@google.com - 2015-12-03 19:10 +0100
        Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own  cacheline Peter Zijlstra <peterz@infradead.org> - 2015-12-03 19:20 +0100
          Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline bsegall@google.com - 2015-12-03 19:30 +0100
      Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline Waiman Long <waiman.long@hpe.com> - 2015-12-03 21:00 +0100
        Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own  cacheline Peter Zijlstra <peterz@infradead.org> - 2015-12-03 21:10 +0100
    [tip:sched/core] sched/fair: Move the cache-hot 'load_avg'   variable into its own cacheline tip-bot for Waiman Long <tipbot@zytor.com> - 2015-12-04 13:00 +0100

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