]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
Resurrect 'try_to_free_buffers()' VM hackery
authorLinus Torvalds <torvalds@woody.linux-foundation.org>
Fri, 26 Jan 2007 20:47:06 +0000 (12:47 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Fri, 26 Jan 2007 20:47:06 +0000 (12:47 -0800)
commitecdfc9787fe527491baefc22dce8b2dbd5b2908d
tree31e7ddac0339498095c40444f81c0b03751434ae
parent5ad0d383ddbf0d2fce43b8aac267a6c299fd2dff
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>
fs/buffer.c
mm/truncate.c