linux-kernel - Re: [RFC PATCH 0/4] mm: reclaim zbud pages on migration and compaction

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Date:	Tue, 06 Aug 2013 15:05:14 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Bob Liu <bob.liu@...cle.com>
Cc:	Seth Jennings <sjenning@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [RFC PATCH 0/4] mm: reclaim zbud pages on migration and compaction

On wto, 2013-08-06 at 17:16 +0800, Bob Liu wrote:
> On 08/06/2013 02:42 PM, Krzysztof Kozlowski wrote:
> > This reclaim process is different than zbud_reclaim_page(). It acts more
> > like swapoff() by trying to unuse pages stored in zbud page and bring
> > them back to memory. The standard zbud_reclaim_page() on the other hand
> > tries to write them back.
> 
> I prefer to migrate zbud pages directly if it's possible than reclaiming
> them during compaction.

I think it is possible however it would be definitely more complex. In
case of migration the zswap handles should be updated as they are just
virtual addresses. Am I right?

Best regards,
Krzysztof


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