linux-kernel - Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value

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Message-ID: <CAOaiJ-=n+fSchrxbB-Lr=bh32HOwsXNLUU==6ZRbbXqufU5n7w@mail.gmail.com>
Date:	Thu, 26 Nov 2015 10:33:59 +0530
From:	vinayak menon <vinayakm.list@...il.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Michal Hocko <mhocko@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value

On Thu, Nov 26, 2015 at 7:26 AM, Joonsoo Kim <iamjoonsoo.kim@....com> wrote:
> On Wed, Nov 25, 2015 at 01:00:22PM +0100, Michal Hocko wrote:
>> On Tue 24-11-15 15:22:03, Joonsoo Kim wrote:
>> > When I tested compaction in low memory condition, I found that
>> > my benchmark is stuck in congestion_wait() at shrink_inactive_list().
>> > This stuck last for 1 sec and after then it can escape. More investigation
>> > shows that it is due to stale vmstat value. vmstat is updated every 1 sec
>> > so it is stuck for 1 sec.
>>
>> Wouldn't it be sufficient to use zone_page_state_snapshot in
>> too_many_isolated?
>
This was done by this patch I believe,
http://lkml.iu.edu/hypermail/linux/kernel/1501.2/00001.html, though
the original  issue (wait of more than 1 sec) was fixed by the vmstat
changes.
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