diff options
| -rw-r--r-- | sys/vm/vm_glue.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sys/vm/vm_glue.c b/sys/vm/vm_glue.c index 8e3f5c6..41e1719 100644 --- a/sys/vm/vm_glue.c +++ b/sys/vm/vm_glue.c @@ -675,9 +675,33 @@ retry: * finishes, or a thread of this * process may attempt to alter * the map. + * + * Watch out for a process in + * creation. It may have no + * address space yet. + * + * An aio daemon switches its + * address space while running. + * Perform a quick check whether + * a process has P_SYSTEM. */ + PROC_LOCK(p); + if ((p->p_flag & P_SYSTEM) != 0) { + PROC_UNLOCK(p); + continue; + } + mtx_lock_spin(&sched_lock); + if (p->p_state == PRS_NEW) { + mtx_unlock_spin(&sched_lock); + PROC_UNLOCK(p); + continue; + } vm = p->p_vmspace; + KASSERT(vm != NULL, + ("swapout_procs: a process has no address space")); ++vm->vm_refcnt; + mtx_unlock_spin(&sched_lock); + PROC_UNLOCK(p); if (!vm_map_trylock(&vm->vm_map)) goto nextproc1; |
