svn commit: r297073 - stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Alexander Motin]

Author: mav
Date: Sun Mar 20 19:07:12 2016
New Revision: 297073
URL: https://svnweb.freebsd.org/changeset/base/297073

Log:
  MFC r277492 (by will): Add vfs.zfs.reference_tracking_enable sysctl/tunable.
  
  This is primarily for developer/debugging use; it enables built-in tagged
  tracking of refcounts inside ZFS.  It can only be enabled from the loader,
  since it modifies how in-core state is managed.  Default remains disabled.

Modified:
  stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/refcount.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/refcount.c
==============================================================================
--- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/refcount.c	Sun Mar 20 19:06:21 2016	(r297072)
+++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/refcount.c	Sun Mar 20 19:07:12 2016	(r297073)
@@ -30,6 +30,11 @@
 
 #ifdef _KERNEL
 int reference_tracking_enable = FALSE; /* runs out of memory too easily */
+SYSCTL_DECL(_vfs_zfs);
+TUNABLE_INT("vfs.zfs.reference_tracking_enable", &reference_tracking_enable);
+SYSCTL_INT(_vfs_zfs, OID_AUTO, reference_tracking_enable, CTLFLAG_RDTUN,
+    &reference_tracking_enable, 0,
+    "Track reference holders to refcount_t objects, used mostly by ZFS");
 #else
 int reference_tracking_enable = TRUE;
 #endif