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

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Message-ID: <20151125120021.GA27342@dhcp22.suse.cz>
Date:	Wed, 25 Nov 2015 13:00:22 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Joonsoo Kim <js1304@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	linux-mm@...ck.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value

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?
-- 
Michal Hocko
SUSE Labs
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