linux-kernel - Re: [RFC 2/8] Don't allow volatile attribute on THP and KSM

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Message-ID: <50E5B173.7070807@linux.vnet.ibm.com>
Date:	Thu, 03 Jan 2013 08:27:31 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC 2/8] Don't allow volatile attribute on THP and KSM

On 01/02/2013 08:28 PM, Minchan Kim wrote:
> VOLATILE imply the the pages in the range isn't working set any more
> so it's pointless that make them to THP/KSM.

One of the points of this implementation is that it be able to preserve
memory contents when there is no pressure.  If those contents happen to
contain a THP/KSM page, and there's no pressure, it seems like the right
thing to do is to leave that memory in place.

It might be a fair thing to do this in order to keep the implementation
more sane at the moment.  But, we should make sure there's some good
text on that in the changelog.

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