linux-kernel - Re: [RFC] oom, but there is enough memory

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Message-ID: <20160331105700.GD27831@dhcp22.suse.cz>
Date:	Thu, 31 Mar 2016 12:57:00 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Xishi Qiu <qiuxishi@...wei.com>
Cc:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] oom, but there is enough memory

On Thu 31-03-16 17:38:06, Xishi Qiu wrote:
[...]
> Hi Michal,
> 
> It's arm64, so DMA is [0-4G], and Normal is [4G-]

I wasn't aware of that. Thanks for the clarification.

> Is that something wrong with the RAM hardware, then trigger the problem?

This is hard to tell but I would try to check which of the page fault
path has returned with VM_FAULT_OOM. This might be a wrong .fault
callback.
-- 
Michal Hocko
SUSE Labs