linux-kernel - [PATCH 0/2] 2 zone_pages

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Date:	Tue, 24 Nov 2015 12:54:58 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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>
Subject: [PATCH 0/2] 2 zone_pages_reclaimable fixes

Hi,
Johannes had a valid point [1] that zone_pages_reclaimable should contain
isolated pages as well. This is what the first patch does. While I was
there I've realized that the current logic of this function allows for
a large overestimation of the reclaimable memory with anon >> nr_swap_pages
which would be visible especially when the swap is getting short on space.
I think this is a bug and this is fixed in the second patch.

I do not have any particular workload which would show significant misbehavior
because of the current implementation though. We mostly just happen to scan
longer than necessary because zone_reclaimable would keep us looping longer
but I still think it makes sense to fix this regardless.

[1] http://lkml.kernel.org/r/20151123182447.GF13000%40cmpxchg.org

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