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authorZach Brown <zach.brown@oracle.com>2006-06-25 05:46:46 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 10:00:54 -0700
commit9f1a3cfcffaed2fbb3206179295c79ca8289f5c3 (patch)
treed7adeab100ff8e2fe0b64fa5b2c9ef09ec60c842 /arch/ia64/pci
parent09a9a45dc62fef5f46a0dc98a3cefdb464cc4aaa (diff)
downloadlinux-linaro-9f1a3cfcffaed2fbb3206179295c79ca8289f5c3.tar.gz
[PATCH] AOP_TRUNCATED_PAGE victims in read_pages() belong in the LRU
AOP_TRUNCATED_PAGE victims in read_pages() belong in the LRU Nick Piggin rightly pointed out that the introduction of AOP_TRUNCATED_PAGE to read_pages() was wrong to leave A_T_P victim pages in the page cache but not put them in the LRU. Failing to do so hid them from the VM. A_T_P just means that the aop method unlocked the page rather than performing IO. It would be very rare that the page was truncated between the unlock and testing A_T_P. So we leave the pages in the LRU for likely reuse soon rather than backing them back out of the page cache. We do this by matching the behaviour before the A_T_P introduction which added pages to the LRU regardless of what ->readpage() did. This doesn't include the unrelated cleanup in Nick's initial fix which changed read_pages() to return void to match its only caller's behaviour of ignoring errors. Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Zach Brown <zach.brown@oracle.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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