Re: [PATCH v2 -mm] memcg: prevent from OOM with too many dirtypages

[Andrew Morton]

On Wed, 11 Jul 2012 18:57:43 -0700 (PDT) Hugh Dickins <hughd@xxxxxxxxxx> wrote:

> --- 3.5-rc6-mm1/mm/vmscan.c	2012-07-11 14:42:13.668335884 -0700
> +++ linux/mm/vmscan.c	2012-07-11 16:01:20.712814127 -0700
> @@ -726,7 +726,8 @@ static unsigned long shrink_page_list(st
>  			 * writeback from reclaim and there is nothing else to
>  			 * reclaim.
>  			 */
> -			if (!global_reclaim(sc) && PageReclaim(page))
> +			if (!global_reclaim(sc) && PageReclaim(page) &&
> +					may_enter_fs)
>  				wait_on_page_writeback(page);
>  			else {
>  				nr_writeback++;

um, that may_enter_fs test got removed because nobody knew why it was
there.  Nobody knew why it was there because it was undocumented.  Do
you see where I'm going with this?

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