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MFC r273026:

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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>
This commit is contained in:
delphij 2014-11-02 19:16:41 +00:00
parent 78541e1020
commit 9a897ad843
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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@ -220,6 +220,7 @@ TUNABLE_QUAD("vfs.zfs.arc_max", &zfs_arc_max);
TUNABLE_QUAD("vfs.zfs.arc_min", &zfs_arc_min);
TUNABLE_QUAD("vfs.zfs.arc_meta_limit", &zfs_arc_meta_limit);
TUNABLE_QUAD("vfs.zfs.arc_average_blocksize", &zfs_arc_average_blocksize);
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");
@ -228,6 +229,10 @@ 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.