Author: delphij
Date: Mon Oct 13 05:34:10 2014
New Revision: 273026
URL: https://svnweb.freebsd.org/changeset/base/273026
Log:
Add a tunable for arc_shrink_shift (vfs.zfs.arc_shrink_shift) that
controls how much fraction, 1/2^arc_shrink_shift, should be reclaimed
when there is memory pressure.
Submitted by: Richard Kojedzinszky <krichy at tvnetwork.hu>
MFC after: 2 weeks
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Mon Oct 13
03:55:47 2014 (r273025)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Mon Oct 13
05:34:10 2014 (r273026)
@@ -217,6 +217,7 @@ SYSINIT(arc_free_target_init, SI_SUB_KTH
arc_free_target_init, NULL);
TUNABLE_QUAD("vfs.zfs.arc_meta_limit", &zfs_arc_meta_limit);
+TUNABLE_INT("vfs.zfs.arc_shrink_shift", &zfs_arc_shrink_shift);
SYSCTL_DECL(_vfs_zfs);
SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, arc_max, CTLFLAG_RDTUN, &zfs_arc_max, 0,
"Maximum ARC size");
@@ -225,6 +226,10 @@ SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, arc_min
SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, arc_average_blocksize, CTLFLAG_RDTUN,
&zfs_arc_average_blocksize, 0,
"ARC average blocksize");
+SYSCTL_INT(_vfs_zfs, OID_AUTO, arc_shrink_shift, CTLFLAG_RW,
+ &arc_shrink_shift, 0,
+ "log2(fraction of arc to reclaim)");
+
/*
* We don't have a tunable for arc_free_target due to the dependency on
* pagedaemon initialisation.
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