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| author | delphij <delphij@FreeBSD.org> | 2014-08-02 04:06:35 +0000 |
|---|---|---|
| committer | delphij <delphij@FreeBSD.org> | 2014-08-02 04:06:35 +0000 |
| commit | fc1b233fa4d8f8aaa75fbdd7cf640d804915f73b (patch) | |
| tree | 999367b0df22064fd8ad8df6c9f3a949f048b01c /sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c | |
| parent | 2f2875361e19bf1fdf4fde5c8e1763dcc4190620 (diff) | |
| download | FreeBSD-src-fc1b233fa4d8f8aaa75fbdd7cf640d804915f73b.zip FreeBSD-src-fc1b233fa4d8f8aaa75fbdd7cf640d804915f73b.tar.gz | |
MFC r268865: MFV r268852:
Reduce lock contention on the z_teardown_lock under heavily cached
read workload by splitting the single teardown rrw lock into
RRM_NUM_LOCKS (17) of them.
Read acquisitions are randomly distributed among these locks based
on curthread pointer. Write acquisitions are going to all the
locks, which for the usage of this type of lock should be rare.
Illumos issue:
5008 lock contention (rrw_exit) while running a read only load
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c')
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c index 6945397..ac55996 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c @@ -276,7 +276,7 @@ zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg) * can safely ensure that the filesystem is not and will not be * unmounted. The next statement is equivalent to ZFS_ENTER(). */ - rrw_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG); + rrm_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG); if (zfsvfs->z_unmounted) { ZFS_EXIT(zfsvfs); rw_exit(&zfsvfs_lock); |
