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author | Zach Brown <zach.brown@oracle.com> | 2006-06-25 05:46:46 -0700 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-25 10:00:54 -0700 |
commit | 9f1a3cfcffaed2fbb3206179295c79ca8289f5c3 (patch) | |
tree | d7adeab100ff8e2fe0b64fa5b2c9ef09ec60c842 /arch/i386/pci | |
parent | 09a9a45dc62fef5f46a0dc98a3cefdb464cc4aaa (diff) | |
download | blackbird-op-linux-9f1a3cfcffaed2fbb3206179295c79ca8289f5c3.tar.gz blackbird-op-linux-9f1a3cfcffaed2fbb3206179295c79ca8289f5c3.zip |
[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>
Diffstat (limited to 'arch/i386/pci')
0 files changed, 0 insertions, 0 deletions