Date: Mon, 13 Oct 2014 05:34:10 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r273026 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201410130534.s9D5YA3M022728@svn.freebsd.org>
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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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