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Date: Mon, 1 Aug 2016 21:43:23 +0200
From: Michal Hocko <mhocko@suse.cz>
Subject: Re: OOM killer changes
Message-ID: <20160801194323.GE31957@dhcp22.suse.cz>
References: <d8f3adcc-3607-1ef6-9ec5-82b2e125eef2@quantum.com>
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 <20160801182358.GB31957@dhcp22.suse.cz>
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To: Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@quantum.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>, Vlastimil Babka <vbabka@suse.cz>

On Mon 01-08-16 12:35:51, Ralf-Peter Rohbeck wrote:
> On 01.08.2016 12:26, Michal Hocko wrote:
[...]
> > the amount of dirty pages is much smaller as well as the anonymous
> > memory. The biggest portion seems to be in the page cache. The memory
>
> The page cache will always be full if I'm writing at full steam to multiple
> drives, no?

Yes, the memory full of page cache is not unusual. The large portion of
that memory being dirty/writeback can be a problem. That is why we have
a dirty memory throttling which slows down (throttles) writers to keep
the amount reasonable. What is your dirty throttling setup?
$ grep . /proc/sys/vm/dirty*

and what is your storage setup?
-- 
Michal Hocko
SUSE Labs

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