linux-kernel - Re: [PATCH 1/2] mm, vmscan: consider isolated pages in zone_reclaimable

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Message-ID: <alpine.DEB.2.10.1511250259590.32374@chino.kir.corp.google.com>
Date:	Wed, 25 Nov 2015 03:00:12 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Michal Hocko <mhocko@...nel.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 1/2] mm, vmscan: consider isolated pages in
 zone_reclaimable_pages

On Tue, 24 Nov 2015, Michal Hocko wrote:

> From: Michal Hocko <mhocko@...e.com>
> 
> zone_reclaimable_pages counts how many pages are reclaimable in
> the given zone. This currently includes all pages on file lrus and
> anon lrus if there is an available swap storage. We do not consider
> NR_ISOLATED_{ANON,FILE} counters though which is not correct because
> these counters reflect temporarily isolated pages which are still
> reclaimable because they either get back to their LRU or get freed
> either by the page reclaim or page migration.
> 
> The number of these pages might be sufficiently high to confuse users of
> zone_reclaimable_pages (e.g. mbind can migrate large ranges of memory at
> once).
> 
> Suggested-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Acked-by: David Rientjes <rientjes@...gle.com>
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