linux-kernel - Re: [PATCH v2 3/3] Prevent promotion of page in madvise

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Date:	Sun, 28 Nov 2010 23:28:05 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ben Gamari <bgamari.foss@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...nel.dk>, Mel Gorman <mel@....ul.ie>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH v2 3/3] Prevent promotion of page in madvise_dontneed

On 11/28/2010 10:02 AM, Minchan Kim wrote:
> Now zap_pte_range alwayas promotes pages which are pte_young&&
> !VM_SequentialReadHint(vma). But in case of calling MADV_DONTNEED,
> it's unnecessary since the page wouldn't use any more.
>
> If the page is sharred by other processes and it's real working set

This line seems to be superfluous, I don't see any special
treatment for this case in the code.

> Signed-off-by: Minchan Kim<minchan.kim@...il.com>
> Cc: Rik van Riel<riel@...hat.com>
> Cc: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> Cc: Johannes Weiner<hannes@...xchg.org>
> Cc: Nick Piggin<npiggin@...nel.dk>
> Cc: Mel Gorman<mel@....ul.ie>
> Cc: Wu Fengguang<fengguang.wu@...el.com>

The patch itself looks good to me.

Acked-by: Rik van Riel <riel@...hat.com>

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