svn commit: r273267 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
Xin LI
delphij at FreeBSD.org
Sat Oct 18 22:11:11 UTC 2014
Author: delphij
Date: Sat Oct 18 22:11:10 2014
New Revision: 273267
URL: https://svnweb.freebsd.org/changeset/base/273267
Log:
Add tunable vfs.zfs.space_map_blksz for space map's maximum block size.
MFC after: 2 weeks
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c Sat Oct 18 19:36:11 2014 (r273266)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c Sat Oct 18 22:11:10 2014 (r273267)
@@ -37,6 +37,8 @@
#include <sys/refcount.h>
#include <sys/zfeature.h>
+SYSCTL_DECL(_vfs_zfs);
+
/*
* The data for a given space map can be kept on blocks of any size.
* Larger blocks entail fewer i/o operations, but they also cause the
@@ -44,6 +46,8 @@
* when only a few blocks have changed since the last transaction group.
*/
int space_map_blksz = (1 << 12);
+SYSCTL_INT(_vfs_zfs, OID_AUTO, space_map_blksz, CTLFLAG_RDTUN, &space_map_blksz, 0,
+ "Maximum block size for space map. Must be power of 2 and greater than 4096.");
/*
* Load the space map disk into the specified range tree. Segments of maptype
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