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Date: Tue, 19 Jul 2016 15:21:20 -0700 (PDT)
From: David Rientjes <rientjes@google.com>
Subject: Re: [PATCH 1/8] mm, compaction: don't isolate PageWriteback pages
 in MIGRATE_SYNC_LIGHT mode
In-Reply-To: <20160718112302.27381-2-vbabka@suse.cz>
Message-ID: <alpine.DEB.2.10.1607191520580.19940@chino.kir.corp.google.com>
References: <20160718112302.27381-1-vbabka@suse.cz> <20160718112302.27381-2-vbabka@suse.cz>
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Sender: owner-linux-mm@kvack.org
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To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Michal Hocko <mhocko@kernel.org>, Mel Gorman <mgorman@techsingularity.net>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Rik van Riel <riel@redhat.com>, Hugh Dickins <hughd@google.com>

On Mon, 18 Jul 2016, Vlastimil Babka wrote:

> From: Hugh Dickins <hughd@google.com>
> 
> At present MIGRATE_SYNC_LIGHT is allowing __isolate_lru_page() to
> isolate a PageWriteback page, which __unmap_and_move() then rejects
> with -EBUSY: of course the writeback might complete in between, but
> that's not what we usually expect, so probably better not to isolate it.
> 
> When tested by stress-highalloc from mmtests, this has reduced the number of
> page migrate failures by 60-70%.
> 
> Signed-off-by: Hugh Dickins <hughd@google.com>
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
> Acked-by: Michal Hocko <mhocko@suse.com>

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

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