linux-kernel - Re: [sched/idle] c365c292d05: ltp.sched_rr_get

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Date:	Fri, 07 Mar 2014 19:32:25 +0800
From:	Jet Chen <jet.chen@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Kirill Tkhai <ktkhai@...allels.com>,
	Juri Lelli <juri.lelli@...il.com>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [sched/idle] c365c292d05: ltp.sched_rr_get_interval02.1.TFAIL

Hi Peter,

> Does: http://lkml.kernel.org/r/20140301191838.d15d03112b2598a671dac22c@gmail.com
>
> Fix it?

Both patches can fix the LTP regression.

We applied each of Juri's and Kirill's patches on top of Thomas' commit,
and here are the comparisons:

test case: ltp/syscalls

Thomas'          Juri's
c365c292d05908c  ffc78ca31d51f90c516bb50cf
---------------  -------------------------
         1 ~ 0%    -100.0%          0 ~ 0%  TOTAL ltp.sched_rr_get_interval02.1.TFAIL
     73790 ~ 5%     -14.1%      63363 ~ 6%  TOTAL interrupts.IWI
      3040 ~ 4%      -6.7%       2836 ~ 5%  TOTAL slabinfo.kmalloc-128.num_objs

Thomas'          Kirill's
c365c292d05908c  f4262311faf6f326bf27fb1f4
---------------  -------------------------
         1 ~ 0%    -100.0%          0 ~ 0%  TOTAL ltp.sched_rr_get_interval02.1.TFAIL
      3618 ~ 6%     -13.2%       3141 ~ 6%  TOTAL slabinfo.anon_vma.active_objs
      3671 ~ 5%     -11.3%       3258 ~ 4%  TOTAL slabinfo.anon_vma.num_objs
      8.41 ~ 2%      -5.1%       7.98 ~ 3%  TOTAL boottime.dhcp
     15.90 ~ 2%      -3.2%      15.40 ~ 2%  TOTAL boottime.boot
     55.18 ~ 1%      -2.6%      53.73 ~ 1%  TOTAL boottime.idle

Thanks,
-Jet

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