diff options
| author | Dave Chinner <dgc@sgi.com> | 2009-11-24 18:03:15 +0000 |
|---|---|---|
| committer | Alex Elder <aelder@sgi.com> | 2009-12-16 13:41:19 -0600 |
| commit | 2ee1abad73a12df5521cd3f017f081f1f684a361 (patch) | |
| tree | e44a88b0ae7f01d339426d7a6d18bde017bb9cf1 /fs/xfs/linux-2.6/xfs_buf.h | |
| parent | b44b1126279b60597f96bbe77507b1650f88a969 (diff) | |
xfs: improve metadata I/O merging in the elevator
Change all async metadata buffers to use [READ|WRITE]_META I/O types
so that the I/O doesn't get issued immediately. This allows merging of
adjacent metadata requests but still prioritises them over bulk data.
This shows a 10-15% improvement in sequential create speed of small
files.
Don't include the log buffers in this classification - leave them as
sync types so they are issued immediately.
Signed-off-by: Dave Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_buf.h')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_buf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h index a509f4addc2a..a34c7b54822d 100644 --- a/fs/xfs/linux-2.6/xfs_buf.h +++ b/fs/xfs/linux-2.6/xfs_buf.h @@ -55,6 +55,7 @@ typedef enum { XBF_FS_MANAGED = (1 << 8), /* filesystem controls freeing memory */ XBF_ORDERED = (1 << 11), /* use ordered writes */ XBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead */ + XBF_LOG_BUFFER = (1 << 13), /* this is a buffer used for the log */ /* flags used only as arguments to access routines */ XBF_LOCK = (1 << 14), /* lock requested */ |