linux-kernel - Re: [PATCH 1/1] mmap: Don't count shmem pages as free in __vm_enough

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Date:	Mon, 4 Jul 2011 09:43:09 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Dmitry Fink <finikk@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Dmitry Fink <dmitry.fink@...m.com>
Subject: Re: [PATCH 1/1] mmap: Don't count shmem pages as free in __vm_enough_memory

On Mon, Jul 4, 2011 at 4:39 AM, Dmitry Fink <finikk@...il.com> wrote:
> shmem pages can't be reclaimed and if they are swapped out
> that doesn't affect the overall available memory in the system,
> so don't count them along with the rest of the file backed pages.
>
> Signed-off-by: Dmitry Fink <dmitry.fink@...m.com>
Reviewed-by: Minchan Kim <minchan.kim@...il.com>

I am not sure the description is good. :(
But I think this patch is reasonable.

In swapless system,guessing overcommit can have a problem.
And in current implementation of OVERCOMMIT_GUESS, we consider anon
pages as empty space of swap so shmem pages should be accounted by
that.

-- 
Kind regards,
Minchan Kim
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