svn commit: r274674 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Xin LI]

Author: delphij
Date: Tue Nov 18 18:52:38 2014
New Revision: 274674
URL: https://svnweb.freebsd.org/changeset/base/274674

Log:
  Add a tunable for spa_slop_shift which controls how much space we
  would reserve by default.  Tuning is not recommended.
  
  MFC after:	2 weeks

Modified:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c	Tue Nov 18 18:40:01 2014	(r274673)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c	Tue Nov 18 18:52:38 2014	(r274674)
@@ -401,6 +401,9 @@ zfs_deadman_init()
  * See also the comments in zfs_space_check_t.
  */
 int spa_slop_shift = 5;
+SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_slop_shift, CTLFLAG_RWTUN,
+    &spa_slop_shift, 0,
+    "Shift value of reserved space (1/(2^spa_slop_shift)).");
 
 /*
  * ==========================================================================