From 8d280b98cfe3c0b69c37d355218975c1c0279bb0 Mon Sep 17 00:00:00 2001 From: David Chinner Date: Tue, 14 Mar 2006 13:13:09 +1100 Subject: [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 Signed-off-by: Nathan Scott --- fs/xfs/linux-2.6/xfs_linux.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'fs/xfs/linux-2.6/xfs_linux.h') 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. -- cgit v1.2.3-18-g5258