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| author | Dave Chinner <dchinner@redhat.com> | 2010-08-24 11:44:56 +1000 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2010-08-24 11:44:56 +1000 |
| commit | efceab1d563153a2b1a6e7d35376241a48126989 (patch) | |
| tree | 1c3f9cf4d947a60f4fa4055ef4847af084e9db0e /drivers/uio | |
| parent | 546a1924224078c6f582e68f890b05b387b42653 (diff) | |
| download | kernel_samsung_crespo-efceab1d563153a2b1a6e7d35376241a48126989.zip kernel_samsung_crespo-efceab1d563153a2b1a6e7d35376241a48126989.tar.gz kernel_samsung_crespo-efceab1d563153a2b1a6e7d35376241a48126989.tar.bz2 | |
xfs: handle negative wbc->nr_to_write during sync writeback
During data integrity (WB_SYNC_ALL) writeback, wbc->nr_to_write will
go negative on inodes with more than 1024 dirty pages due to
implementation details of write_cache_pages(). Currently XFS will
abort page clustering in writeback once nr_to_write drops below
zero, and so for data integrity writeback we will do very
inefficient page at a time allocation and IO submission for inodes
with large numbers of dirty pages.
Fix this by only aborting the page clustering code when
wbc->nr_to_write is negative and the sync mode is WB_SYNC_NONE.
Cc: <stable@kernel.org>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/uio')
0 files changed, 0 insertions, 0 deletions