From: Shaohua Li <shaohua.li@intel.com>
Date: Tue, 22 Sep 2009 00:01:19 +0000 (-0700)
Subject: memory hotplug: migrate swap cache page
X-Git-Tag: v2.6.32-rc1~590
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=abfc3488118d48a2b8cce5a2345901aac6b03fee;p=pandora-kernel.git

memory hotplug: migrate swap cache page

In test, some pages in swap-cache can't be migrated, as they aren't rmap.

unmap_and_move() ignores swap-cache page which is just read in and hasn't
rmap (see the comments in the code), but swap_aops provides .migratepage.
Better to migrate such pages instead of ignore them.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Yakui Zhao <yakui.zhao@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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