linux-kernel - Re: [RFC PATCH 1/2] mm, vmscan: account the number of isolated pages per zone

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Message-ID: <20170125101957.GA17632@lst.de>
Date:   Wed, 25 Jan 2017 11:19:57 +0100
From:   Christoph Hellwig <hch@....de>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Christoph Hellwig <hch@....de>, mgorman@...e.de,
        viro@...IV.linux.org.uk, linux-mm@...ck.org, hannes@...xchg.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] mm, vmscan: account the number of isolated
        pages per zone

On Wed, Jan 25, 2017 at 11:15:17AM +0100, Michal Hocko wrote:
> I think we are missing a check for fatal_signal_pending in
> iomap_file_buffered_write. This means that an oom victim can consume the
> full memory reserves. What do you think about the following? I haven't
> tested this but it mimics generic_perform_write so I guess it should
> work.

Hi Michal,

this looks reasonable to me.  But we have a few more such loops,
maybe it makes sense to move the check into iomap_apply?