From: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Date: Tue, 2 Apr 2013 02:46:14 +0000 (+0800)
Subject: staging: zcache: zero-filled pages awareness
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~137^2~353
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8762c7dde745f1de0488c6a3ed6894390303f76f;p=pandora-kernel.git

staging: zcache: zero-filled pages awareness

Compression of zero-filled pages can unneccessarily cause internal
fragmentation, and thus waste memory. This special case can be
optimized.

This patch captures zero-filled pages, and marks their corresponding
zcache backing page entry as zero-filled. Whenever such zero-filled
page is retrieved, we fill the page frame with zero.

Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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