From: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Date: Tue, 2 Apr 2013 02:46:15 +0000 (+0800)
Subject: staging: zcache: handle zcache_[eph|pers]_zpages for zero-filled page
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~137^2~352
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0749e77ae972713c1734cea069f32597ecedbd5;p=pandora-kernel.git

staging: zcache: handle zcache_[eph|pers]_zpages for zero-filled page

Increment/decrement zcache_[eph|pers]_zpages for zero-filled pages,
the main point of the counters for zpages and pageframes is to be
able to calculate density == zpages/pageframes. A zero-filled page
becomes a zpage that "compresses" to zero bytes and, as a result,
requires zero pageframes for storage. So the zpages counter should
be increased but the pageframes counter should not.

[Dan Magenheimer <dan.magenheimer@oracle.com>: patch description]
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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