linux-kernel - Re: doing lots of disk writes causes oom killer to kill processes

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Message-ID: <CAOMqctSyovsfff++g=cUfRLmyBM9nHrQ7RB4R7z96-aXr9QcEw@mail.gmail.com>
Date:	Fri, 20 Sep 2013 13:20:53 +0200
From:	Michal Suchanek <hramrach@...il.com>
To:	Hillf Danton <dhillf@...il.com>, Linux-MM <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jan Kara <jack@...e.cz>
Subject: Re: doing lots of disk writes causes oom killer to kill processes

Hello,

On 19 September 2013 10:07, Hillf Danton <dhillf@...il.com> wrote:
> Hello Michal
>
> Take it easy please, the kernel is made by human hands.
>
> Can you please try the diff(and sorry if mail agent reformats it)?
>
> Best Regards
> Hillf
>
>
> --- a/mm/vmscan.c Wed Sep 18 08:44:08 2013
> +++ b/mm/vmscan.c Wed Sep 18 09:31:34 2013
> @@ -1543,8 +1543,11 @@ shrink_inactive_list(unsigned long nr_to
>   * implies that pages are cycling through the LRU faster than
>   * they are written so also forcibly stall.
>   */
> - if (nr_unqueued_dirty == nr_taken || nr_immediate)
> + if (nr_unqueued_dirty == nr_taken || nr_immediate) {
> + if (current_is_kswapd())
> + wakeup_flusher_threads(0, WB_REASON_TRY_TO_FREE_PAGES);
>   congestion_wait(BLK_RW_ASYNC, HZ/10);
> + }
>   }
>
>   /*
> --

I applied the patch and raised the dirty block ratios to 30/10 and the
default 60/40 while imaging a VM and did not observe any problems so I
guess this solves it.

Thanks

Michal
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