Date: Thu, 31 Dec 2009 11:49:13 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r201338 - stable/8/sys/kern Message-ID: <200912311149.nBVBnDDu096809@svn.freebsd.org>
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Author: kib Date: Thu Dec 31 11:49:13 2009 New Revision: 201338 URL: http://svn.freebsd.org/changeset/base/201338 Log: MFC r201134: Add a knob to allow reclaim of the directory vnodes that are source of the namecache records. Modified: stable/8/sys/kern/vfs_subr.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) stable/8/sys/dev/xen/xenpci/ (props changed) Modified: stable/8/sys/kern/vfs_subr.c ============================================================================== --- stable/8/sys/kern/vfs_subr.c Thu Dec 31 10:53:04 2009 (r201337) +++ stable/8/sys/kern/vfs_subr.c Thu Dec 31 11:49:13 2009 (r201338) @@ -152,6 +152,10 @@ SYSCTL_LONG(_vfs, OID_AUTO, wantfreevnod static u_long freevnodes; SYSCTL_LONG(_vfs, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, ""); +static int vlru_allow_cache_src; +SYSCTL_INT(_vfs, OID_AUTO, vlru_allow_cache_src, CTLFLAG_RW, + &vlru_allow_cache_src, 0, "Allow vlru to reclaim source vnode"); + /* * Various variables used for debugging the new implementation of * reassignbuf(). @@ -643,7 +647,9 @@ vlrureclaim(struct mount *mp) * If it's been deconstructed already, it's still * referenced, or it exceeds the trigger, skip it. */ - if (vp->v_usecount || !LIST_EMPTY(&(vp)->v_cache_src) || + if (vp->v_usecount || + (!vlru_allow_cache_src && + !LIST_EMPTY(&(vp)->v_cache_src)) || (vp->v_iflag & VI_DOOMED) != 0 || (vp->v_object != NULL && vp->v_object->resident_page_count > trigger)) { VI_UNLOCK(vp); @@ -668,7 +674,9 @@ vlrureclaim(struct mount *mp) * interlock, the other thread will be unable to drop the * vnode lock before our VOP_LOCK() call fails. */ - if (vp->v_usecount || !LIST_EMPTY(&(vp)->v_cache_src) || + if (vp->v_usecount || + (!vlru_allow_cache_src && + !LIST_EMPTY(&(vp)->v_cache_src)) || (vp->v_object != NULL && vp->v_object->resident_page_count > trigger)) { VOP_UNLOCK(vp, LK_INTERLOCK);
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