linux-kernel - Re: [PATCH v3 3/3] mm/zswap: avoid unnecessary page scanning

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Message-Id: <20131010125506.158c871becad30328abf6838@linux-foundation.org>
Date:	Thu, 10 Oct 2013 12:55:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Weijie Yang <weijie.yang@...sung.com>
Cc:	sjenning@...ux.vnet.ibm.com, bob.liu@...cle.com,
	minchan@...nel.org, weijie.yang.kh@...il.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	d.j.shin@...sung.com, heesub.shin@...sung.com,
	kyungmin.park@...sung.com, hau.chen@...sung.com,
	bifeng.tong@...sung.com, rui.xie@...sung.com
Subject: Re: [PATCH v3 3/3] mm/zswap: avoid unnecessary page scanning

On Mon, 23 Sep 2013 16:21:49 +0800 Weijie Yang <weijie.yang@...sung.com> wrote:

> add SetPageReclaim before __swap_writepage so that page can be moved to the
> tail of the inactive list, which can avoid unnecessary page scanning as this
> page was reclaimed by swap subsystem before.
> 
> Signed-off-by: Weijie Yang <weijie.yang@...sung.com>
> Reviewed-by: Bob Liu <bob.liu@...cle.com>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: stable@...r.kernel.org
> Acked-by: Seth Jennings <sjenning@...ux.vnet.ibm.com>

As a minor(?) performance tweak, I don't believe this is suitable for
-stable backporting, so I took that out.  If you believe this was a
mistake, please explain why.


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