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MFC r201134:

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Add a knob to allow reclaim of the directory vnodes that are source of
the namecache records.
This commit is contained in:
Konstantin Belousov 2009-12-31 11:49:13 +00:00
parent 35e0c29fdf
commit e6b37c3a7f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/stable/8/; revision=201338
1 changed files with 10 additions and 2 deletions
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12
sys/kern/vfs_subr.c
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@ -152,6 +152,10 @@ SYSCTL_LONG(_vfs, OID_AUTO, wantfreevnodes, CTLFLAG_RW, &wantfreevnodes, 0, "");
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);