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Add a tunable for arc_shrink_shift (vfs.zfs.arc_shrink_shift) that

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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
This commit is contained in:
Xin LI 2014-10-13 05:34:10 +00:00
parent e58fb51fc7
commit a4f5b8db9f
1 changed files with 5 additions and 0 deletions
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5
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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@ -217,6 +217,7 @@ SYSINIT(arc_free_target_init, SI_SUB_KTHREAD_PAGE, SI_ORDER_ANY,
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, CTLFLAG_RDTUN, &zfs_arc_min, 0,
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.