linux-kernel - Re: [cgroup] a0f9ec1f181: -4.3% will-it-scale.per_thread

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Message-ID: <20140515045517.GC3825@htj.dyndns.org>
Date:	Thu, 15 May 2014 00:55:17 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Jet Chen <jet.chen@...el.com>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [cgroup] a0f9ec1f181: -4.3% will-it-scale.per_thread_ops

Hello,

On Thu, May 15, 2014 at 12:50:39PM +0800, Jet Chen wrote:
> FYI, we noticed the below changes on
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-kill-tree_mutex
> commit a0f9ec1f181534694cb5bf40b7b56515b8cabef9 ("cgroup: use cgroup_kn_lock_live() in other cgroup kernfs methods")
> 
> Test case : lkp-nex05/will-it-scale/writeseek
> 
> 2074b6e38668e62  a0f9ec1f181534694cb5bf40b
> ---------------  -------------------------
>    1027273 ~ 0%      -4.3%     982732 ~ 0%  TOTAL will-it-scale.per_thread_ops
>        136 ~ 3%     -43.1%         77 ~43%  TOTAL proc-vmstat.nr_dirtied
>       0.51 ~ 3%     +98.0%       1.01 ~ 4%  TOTAL perf-profile.cpu-cycles.shmem_write_end.generic_perform_write.__generic_file_aio_write.generic_file_aio_write.do_sync_write
>       1078 ~ 9%     -16.3%        903 ~11%  TOTAL numa-meminfo.node0.Unevictable
>        269 ~ 9%     -16.2%        225 ~11%  TOTAL numa-vmstat.node0.nr_unevictable
>       1.64 ~ 1%     -14.3%       1.41 ~ 4%  TOTAL perf-profile.cpu-cycles.find_lock_entry.shmem_getpage_gfp.shmem_write_begin.generic_perform_write.__generic_file_aio_write
>       1.62 ~ 2%     +14.1%       1.84 ~ 1%  TOTAL perf-profile.cpu-cycles.lseek64

I have no idea how to read the above.  Which direction is plus and
which is minus?  Are they counting cpu cycles?  Which files is the
test seeking?

Thanks.

-- 
tejun
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