Subject: Re: [PATCH 0/3] Make workingset detection logic memcg aware
To: Vladimir Davydov <vdavydov@parallels.com>,
        Andrew Morton <akpm@linux-foundation.org>
References: <cover.1438599199.git.vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@kernel.org>,
        Minchan Kim <minchan@kernel.org>, Rik van Riel <riel@redhat.com>,
        Mel Gorman <mgorman@suse.de>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
From: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Message-ID: <55C16842.9040505@jp.fujitsu.com>
Date: Wed, 5 Aug 2015 10:34:58 +0900
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On 2015/08/03 21:04, Vladimir Davydov wrote:
> Hi,
> 
> Currently, workingset detection logic is not memcg aware - inactive_age
> is maintained per zone. As a result, if memory cgroups are used,
> refaulted file pages are activated randomly. This patch set makes
> inactive_age per lruvec so that workingset detection will work correctly
> for memory cgroup reclaim.
> 
> Thanks,
> 

Reading discussion, I feel storing more data is difficult, too.

I wonder, rather than collecting more data, rough calculation can help the situation.
for example,

   (refault_disatance calculated in zone) * memcg_reclaim_ratio < memcg's active list

If one of per-zone calc or per-memcg calc returns true, refault should be true.

memcg_reclaim_ratio is the percentage of scan in a memcg against in a zone.


Thanks,
-Kame


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