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

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Message-ID: <20170124134424.GL6867@dhcp22.suse.cz>
Date:   Tue, 24 Jan 2017 14:44:25 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     kernel test robot <xiaolong.ye@...el.com>
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 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
perf profiles before and after the patch.
-- 
Michal Hocko
SUSE Labs