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Subject: Re: OOM killer changes
References: <d8116023-dcd4-8763-af77-f2889f84cdb6@Quantum.com>
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From: Vlastimil Babka <vbabka@suse.cz>
Message-ID: <082f48bf-dacd-b65d-7e48-8c56b1a9f805@suse.cz>
Date: Wed, 17 Aug 2016 11:20:31 +0200
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To: Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@quantum.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@suse.cz>, "linux-mm@kvack.org" <linux-mm@kvack.org>

On 08/17/2016 11:11 AM, Ralf-Peter Rohbeck wrote:
> On 17.08.2016 00:56, Vlastimil Babka wrote:
>> And I really wonder how did all those unmovable pageblocks happen.
>> AFAICS zoneinfo shows that most of memory is occupied by file lru pages.
>> These should be movable.
>
> Is it the pressure on the page cache? Don't forget that I write to some
> disk drives (recently, 2) at media speed with dd if=/dev/zero bs=4M
> of=/dev/SDX.

Hmm page cache should be movable. But maybe it's different for writing 
to devices and not filesystems.

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