From: Martin Schwidefsky Date: Sun, 24 Jul 2011 08:47:59 +0000 (+0200) Subject: [S390] reference bit testing for unmapped pages X-Git-Tag: v3.1-rc1~261^2~18 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=50a15981a1fac7e019ff7c3cba87531fb580f065;p=pandora-kernel.git [S390] reference bit testing for unmapped pages On x86 a page without a mapper is by definition not referenced / old. The s390 architecture keeps the reference bit in the storage key and the current code will check the storage key for page without a mapper. This leads to an interesting effect: the first time an s390 system needs to write pages to swap it only finds referenced pages. This causes a lot of pages to get added and written to the swap device. To avoid this behaviour change page_referenced to query the storage key only if there is a mapper of the page. Signed-off-by: Martin Schwidefsky --- Reading git-diff-tree failed