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authorDavid Chinner <dgc@sgi.com>2006-03-14 13:13:09 +1100
committerNathan Scott <nathans@sgi.com>2006-03-14 13:13:09 +1100
commit8d280b98cfe3c0b69c37d355218975c1c0279bb0 (patch)
tree2dc1deaec23a7da29b72152a4225c2600dacf1d4 /fs/xfs/linux-2.6/xfs_linux.h
parent9f4cbecd7e5ee6390fecd6032dc04ca8c9805dc9 (diff)
[XFS] On machines with more than 8 cpus, when running parallel I/O
threads, the incore superblock lock becomes the limiting factor for buffered write throughput. Make the contended fields in the incore superblock use per-cpu counters so that there is no global lock to limit scalability. SGI-PV: 946630 SGI-Modid: xfs-linux-melb:xfs-kern:25106a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_linux.h')
-rw-r--r--fs/xfs/linux-2.6/xfs_linux.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_linux.h b/fs/xfs/linux-2.6/xfs_linux.h
index 67389b74552..377a9f54a04 100644
--- a/fs/xfs/linux-2.6/xfs_linux.h
+++ b/fs/xfs/linux-2.6/xfs_linux.h
@@ -100,6 +100,11 @@
*/
#undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
#define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */
+#if CONFIG_SMP
+#define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
+#else
+#undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
+#endif
/*
* State flag for unwritten extent buffers.