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| author | David Chinner <dgc@sgi.com> | 2006-03-14 03:13:09 +0100 |
|---|---|---|
| committer | Nathan Scott <nathans@sgi.com> | 2006-03-14 03:13:09 +0100 |
| commit | 8d280b98cfe3c0b69c37d355218975c1c0279bb0 (patch) | |
| tree | 2dc1deaec23a7da29b72152a4225c2600dacf1d4 /fs/xfs/linux-2.6/xfs_linux.h | |
| parent | [XFS] XFS propagates MS_NOATIME through two levels internally but doesn't (diff) | |
| download | linux-8d280b98cfe3c0b69c37d355218975c1c0279bb0.tar.xz linux-8d280b98cfe3c0b69c37d355218975c1c0279bb0.zip | |
[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.h | 5 |
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 67389b745526..377a9f54a049 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. |