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authorDavid Chinner <dgc@sgi.com>2007-11-23 16:29:18 +1100
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-02-07 18:16:07 +1100
commit5d51eff4538bdfeb9b7a2ec030ee3b0980b067d2 (patch)
tree27606a34eab830ccc9a066f14f598af0c0c9027c /fs/afs
parente4143a1cf5973e3443c0650fc4c35292d3b7baa8 (diff)
[XFS] Fix inode allocation latency
The log force added in xfs_iget_core() has been a performance issue since it was introduced for tight loops that allocate then unlink a single file. under heavy writeback, this can introduce unnecessary latency due tothe log I/o getting stuck behind bulk data writes. Fix this latency problem by avoinding the need for the log force by moving the place we mark linux inode dirty to the transaction commit rather than on transaction completion. This also closes a potential hole in the sync code where a linux inode is not dirty between the time it is modified and the time the log buffer has been written to disk. SGI-PV: 972753 SGI-Modid: xfs-linux-melb:xfs-kern:30007a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
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