diff options
| author | kib <kib@FreeBSD.org> | 2012-10-14 19:43:37 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2012-10-14 19:43:37 +0000 |
| commit | cc37fedcd0324cd8e44b810a580a7e9fcdd26f99 (patch) | |
| tree | e5202103aa2aae9dd9bd65c2fb10665b306571b3 /sys/kern/subr_trap.c | |
| parent | 9b9c40ae6f4bb8aa77c9f7e392a4384ca2242fe7 (diff) | |
| download | FreeBSD-src-cc37fedcd0324cd8e44b810a580a7e9fcdd26f99.zip FreeBSD-src-cc37fedcd0324cd8e44b810a580a7e9fcdd26f99.tar.gz | |
Add a KPI to allow to reserve some amount of space in the numvnodes
counter, without actually allocating the vnodes. The supposed use of
the getnewvnode_reserve(9) is to reclaim enough free vnodes while the
code still does not hold any resources that might be needed during the
reclamation, and to consume the slack later for getnewvnode() calls
made from the innards. After the critical block is finished, the
caller shall free any reserve left, by getnewvnode_drop_reserve(9).
Reviewed by: avg
Tested by: pho
MFC after: 1 week
Diffstat (limited to 'sys/kern/subr_trap.c')
| -rw-r--r-- | sys/kern/subr_trap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/kern/subr_trap.c b/sys/kern/subr_trap.c index 24960fd..66e3201 100644 --- a/sys/kern/subr_trap.c +++ b/sys/kern/subr_trap.c @@ -154,6 +154,8 @@ userret(struct thread *td, struct trapframe *frame) ("userret: Returning with sleep disabled")); KASSERT(td->td_pinned == 0, ("userret: Returning with with pinned thread")); + KASSERT(td->td_vp_reserv == 0, + ("userret: Returning while holding vnode reservation")); #ifdef VIMAGE /* Unfortunately td_vnet_lpush needs VNET_DEBUG. */ VNET_ASSERT(curvnet == NULL, |
