Re: [cgroup] a0f9ec1f181: -4.3% will-it-scale.per_thread_ops

From: Tejun Heo
Date: Thu May 15 2014 - 00:55:27 EST


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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