linux-kernel - Re: [lkp-robot] [mm, vmscan] 5e56dfbd83: fsmark.files_per

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Message-ID: <20170204081604.GH12121@yexl-desktop>
Date:   Sat, 4 Feb 2017 16:16:04 +0800
From:   Ye Xiaolong <xiaolong.ye@...el.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Minchan Kim <minchan@...nel.org>,
        Hillf Danton <hillf.zj@...baba-inc.com>,
        Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [lkp-robot] [mm, vmscan]  5e56dfbd83:  fsmark.files_per_sec
 -11.1% regression

On 01/26, Michal Hocko wrote:
>On Wed 25-01-17 12:27:06, Ye Xiaolong wrote:
>> On 01/24, Michal Hocko wrote:
>> >On Mon 23-01-17 09:26:44, kernel test robot wrote:
>> >> 
>> >> Greeting,
>> >> 
>> >> FYI, we noticed a -11.1% regression of fsmark.files_per_sec due to commit:
>> >> 
>> >> 
>> >> commit: 5e56dfbd837421b7fa3c6c06018c6701e2704917 ("mm, vmscan: consider eligible zones in get_scan_count")
>> >> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
>> >
>> >This is more than unexpected. This patch should be basically noop for
>> >anything but CONFIG_HIGHMEM systems. And your config says this is 64b
>> >kernel. Are those results reproducible? And could you try to compare
>> 
>> Yes, the results are well reproducible, both the commit in question and its
>> parent have ran for 4 times.
>> 
>> >perf profiles before and after the patch.
>> 
>> Here is the perf profiles, 
>
>I do not see any reclaim path in the profile... Could you take a
>snapshot of /proc/vmstat and /proc/zoneinfo before and after the test
>please?

Sorry for the late, just come back from a vacation. Proc data is attached.

Thanks,
Xiaolong

>
>-- 
>Michal Hocko
>SUSE Labs

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