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Date: Tue, 24 Nov 2015 11:03:52 -0500
From: Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 1/2] mm, vmscan: consider isolated pages in
 zone_reclaimable_pages
Message-ID: <20151124160352.GA9598@cmpxchg.org>
References: <1448366100-11023-1-git-send-email-mhocko@kernel.org>
 <1448366100-11023-2-git-send-email-mhocko@kernel.org>
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In-Reply-To: <1448366100-11023-2-git-send-email-mhocko@kernel.org>
Sender: owner-linux-mm@kvack.org
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To: Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, Vladimir Davydov <vdavydov@parallels.com>, Vlastimil Babka <vbabka@suse.cz>, Mel Gorman <mgorman@suse.de>, linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>, Michal Hocko <mhocko@suse.com>

On Tue, Nov 24, 2015 at 12:54:59PM +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.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@cmpxchg.org>
> Signed-off-by: Michal Hocko <mhocko@suse.com>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>

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