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Add tunable vfs.zfs.space_map_blksz for space map's maximum block size.

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MFC after:	2 weeks
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Xin LI 2014-10-18 22:11:10 +00:00
parent e77f9fed15
commit 78701de4b7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=273267
1 changed files with 4 additions and 0 deletions
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sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c
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@ -37,6 +37,8 @@
#include <sys/refcount.h> #include <sys/refcount.h>
#include <sys/zfeature.h> #include <sys/zfeature.h>
SYSCTL_DECL(_vfs_zfs);
/* /*
* The data for a given space map can be kept on blocks of any size. * 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 * 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. * when only a few blocks have changed since the last transaction group.
*/ */
int space_map_blksz = (1 << 12); 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 * Load the space map disk into the specified range tree. Segments of maptype