linux-kernel - Re: [patch v2 1/4] mm, migration: add destination page freeing callback

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Date:	Fri, 2 May 2014 11:10:28 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Greg Thelen <gthelen@...gle.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch v2 1/4] mm, migration: add destination page freeing
 callback

On Thu, May 01, 2014 at 02:35:37PM -0700, David Rientjes wrote:
> Memory migration uses a callback defined by the caller to determine how to
> allocate destination pages.  When migration fails for a source page, however, it 
> frees the destination page back to the system.
> 
> This patch adds a memory migration callback defined by the caller to determine 
> how to free destination pages.  If a caller, such as memory compaction, builds 
> its own freelist for migration targets, this can reuse already freed memory 
> instead of scanning additional memory.
> 
> If the caller provides a function to handle freeing of destination pages, it is 
> called when page migration fails.  Otherwise, it may pass NULL and freeing back 
> to the system will be handled as usual.  This patch introduces no functional 
> change.
> 
> Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs
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