linux-kernel - Re: [PATCHv8 5/8] mm: break up swap_writepage() for frontswap backends

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Date:	Thu, 04 Apr 2013 17:30:32 -0500
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Minchan Kim <minchan@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Jenifer Hopper <jhopper@...ibm.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Joe Perches <joe@...ches.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Hugh Dickens <hughd@...gle.com>,
	Paul Mackerras <paulus@...ba.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	Bob Liu <lliubbo@...il.com>
Subject: Re: [PATCHv8 5/8] mm: break up swap_writepage() for frontswap backends

On 04/04/2013 05:10 PM, Seth Jennings wrote:
> swap_writepage() is currently where frontswap hooks into the swap
> write path to capture pages with the frontswap_store() function.
> However, if a frontswap backend wants to "resume" the writeback of
> a page to the swap device, it can't call swap_writepage() as
> the page will simply reenter the backend.
> 
> This patch separates swap_writepage() into a top and bottom half, the
> bottom half named __swap_writepage() to allow a frontswap backend,
> like zswap, to resume writeback beyond the frontswap_store() hook.
> 
> __add_to_swap_cache() is also made non-static so that the page for
> which writeback is to be resumed can be added to the swap cache.
> 
> Acked-by: Minchan Kim <minchan@...nel.org>
> Signed-off-by: Seth Jennings <sjenning@...ux.vnet.ibm.com>

Adding Cc Bob Liu.

I just remembered that Bob had done a repost of the 5 and 6 patches,
outside the zswap thread,  with a small change to avoid a checkpatch
warning.  I didn't pull that change into my version, but I should have.

It doesn't make a functional difference, so this patch can still go
forward and the checkpatch warning can be cleaned up in a subsequent
patch.  If another revision of the patchset is needed for other
reasons, I'll pull this change into the next version.

I think Dan and Bob would be ok with their tags being applied to 5 and 6:

Acked-by: Bob Liu <bob.liu@...cle.com>
Reviewed-by: Dan Magenheimer <dan.magenheimer@...cle.com>

That ok?

Thanks,
Seth

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