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author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-26 12:47:06 -0800 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-26 12:47:06 -0800 |
commit | ecdfc9787fe527491baefc22dce8b2dbd5b2908d (patch) | |
tree | 31e7ddac0339498095c40444f81c0b03751434ae /fs/fs-writeback.c | |
parent | 5ad0d383ddbf0d2fce43b8aac267a6c299fd2dff (diff) | |
download | op-kernel-dev-ecdfc9787fe527491baefc22dce8b2dbd5b2908d.zip op-kernel-dev-ecdfc9787fe527491baefc22dce8b2dbd5b2908d.tar.gz |
Resurrect 'try_to_free_buffers()' VM hackery
It's not pretty, but it appears that ext3 with data=journal will clean
pages without ever actually telling the VM that they are clean. This,
in turn, will result in the VM (and balance_dirty_pages() in particular)
to never realize that the pages got cleaned, and wait forever for an
event that already happened.
Technically, this seems to be a problem with ext3 itself, but it used to
be hidden by 'try_to_free_buffers()' noticing this situation on its own,
and just working around the filesystem problem.
This commit re-instates that hack, in order to avoid a regression for
the 2.6.20 release. This fixes bugzilla 7844:
http://bugzilla.kernel.org/show_bug.cgi?id=7844
Peter Zijlstra points out that we should probably retain the debugging
code that this removes from cancel_dirty_page(), and I agree, but for
the imminent release we might as well just silence the warning too
(since it's not a new bug: anything that triggers that warning has been
around forever).
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fs-writeback.c')
0 files changed, 0 insertions, 0 deletions