Author: jhb
Date: Sat Feb 14 17:02:51 2015
New Revision: 278760
URL: https://svnweb.freebsd.org/changeset/base/278760
Log:
Add two new counters for vnode life cycle events:
- vfs.recycles counts the number of vnodes forcefully recycled to avoid
exceeding kern.maxvnodes.
- vfs.vnodes_created counts the number of vnodes created by successful
calls to getnewvnode().
Differential Revision: https://reviews.freebsd.org/D1671
Reviewed by: kib
MFC after: 1 week
Modified:
head/sys/kern/vfs_subr.c
Modified: head/sys/kern/vfs_subr.c
==============================================================================
--- head/sys/kern/vfs_subr.c Sat Feb 14 16:23:04 2015 (r278759)
+++ head/sys/kern/vfs_subr.c Sat Feb 14 17:02:51 2015 (r278760)
@@ -122,6 +122,10 @@ static unsigned long numvnodes;
SYSCTL_ULONG(_vfs, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0,
"Number of vnodes in existence");
+static u_long vnodes_created;
+SYSCTL_ULONG(_vfs, OID_AUTO, vnodes_created, CTLFLAG_RD, &vnodes_created,
+ 0, "Number of vnodes created by getnewvnode");
+
/*
* Conversion tables for conversion from vnode types to inode formats
* and back.
@@ -156,6 +160,10 @@ 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");
+static u_long recycles_count;
+SYSCTL_ULONG(_vfs, OID_AUTO, recycles, CTLFLAG_RD, &recycles_count, 0,
+ "Number of vnodes recycled to avoid exceding kern.maxvnodes");
+
/*
* Various variables used for debugging the new implementation of
* reassignbuf().
@@ -788,6 +796,7 @@ vlrureclaim(struct mount *mp)
}
KASSERT((vp->v_iflag & VI_DOOMED) == 0,
("VI_DOOMED unexpectedly detected in vlrureclaim()"));
+ atomic_add_long(&recycles_count, 1);
vgonel(vp);
VOP_UNLOCK(vp, 0);
vdropl(vp);
@@ -988,8 +997,10 @@ vtryrecycle(struct vnode *vp)
__func__, vp);
return (EBUSY);
}
- if ((vp->v_iflag & VI_DOOMED) == 0)
+ if ((vp->v_iflag & VI_DOOMED) == 0) {
+ atomic_add_long(&recycles_count, 1);
vgonel(vp);
+ }
VOP_UNLOCK(vp, LK_INTERLOCK);
vn_finished_write(vnmp);
return (0);
@@ -1093,6 +1104,7 @@ getnewvnode(const char *tag, struct moun
atomic_add_long(&numvnodes, 1);
mtx_unlock(&vnode_free_list_mtx);
alloc:
+ atomic_add_long(&vnodes_created, 1);
vp = (struct vnode *) uma_zalloc(vnode_zone, M_WAITOK|M_ZERO);
/*
* Setup locks.
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