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authorDave Chinner <dchinner@redhat.com>2010-09-28 06:27:25 +0400
committerAlex Elder <aelder@sgi.com>2010-10-19 00:07:45 +0400
commitdcd79a1423f64ee0184629874805c3ac40f3a2c5 (patch)
tree7015d6b6537d4fe3f5371a843a0a9cd45204fb47 /fs/xfs/xfs_trans.h
parente176579e70118ed7cfdb60f963628fe0ca771f3d (diff)
downloadlinux-dcd79a1423f64ee0184629874805c3ac40f3a2c5.tar.xz
xfs: don't use vfs writeback for pure metadata modifications
Under heavy multi-way parallel create workloads, the VFS struggles to write back all the inodes that have been changed in age order. The bdi flusher thread becomes CPU bound, spending 85% of it's time in the VFS code, mostly traversing the superblock dirty inode list to separate dirty inodes old enough to flush. We already keep an index of all metadata changes in age order - in the AIL - and continued log pressure will do age ordered writeback without any extra overhead at all. If there is no pressure on the log, the xfssyncd will periodically write back metadata in ascending disk address offset order so will be very efficient. Hence we can stop marking VFS inodes dirty during transaction commit or when changing timestamps during transactions. This will keep the inodes in the superblock dirty list to those containing data or unlogged metadata changes. However, the timstamp changes are slightly more complex than this - there are a couple of places that do unlogged updates of the timestamps, and the VFS need to be informed of these. Hence add a new function xfs_trans_ichgtime() for transactional changes, and leave xfs_ichgtime() for the non-transactional changes. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Alex Elder <aelder@sgi.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_trans.h')
-rw-r--r--fs/xfs/xfs_trans.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index c13c0f97b494..e2cbe4da7d8e 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -473,6 +473,7 @@ void xfs_trans_dquot_buf(xfs_trans_t *, struct xfs_buf *, uint);
void xfs_trans_inode_alloc_buf(xfs_trans_t *, struct xfs_buf *);
int xfs_trans_iget(struct xfs_mount *, xfs_trans_t *,
xfs_ino_t , uint, uint, struct xfs_inode **);
+void xfs_trans_ichgtime(struct xfs_trans *, struct xfs_inode *, int);
void xfs_trans_ijoin_ref(struct xfs_trans *, struct xfs_inode *, uint);
void xfs_trans_ijoin(struct xfs_trans *, struct xfs_inode *);
void xfs_trans_log_buf(xfs_trans_t *, struct xfs_buf *, uint, uint);