diff options
| author | alc <alc@FreeBSD.org> | 2003-06-07 23:22:04 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2003-06-07 23:22:04 +0000 |
| commit | e448f32b5288cd0687b93ea802a60f2dd9b488cd (patch) | |
| tree | eab9f320a14be9981290f8a819ed702033385ac3 /sys/vm/vm_page.c | |
| parent | d25df9535be030baf3be969e48b789bc32d026cb (diff) | |
| download | FreeBSD-src-e448f32b5288cd0687b93ea802a60f2dd9b488cd.zip FreeBSD-src-e448f32b5288cd0687b93ea802a60f2dd9b488cd.tar.gz | |
Teach vm_page_grab() how to handle the vm object's lock.
Diffstat (limited to 'sys/vm/vm_page.c')
| -rw-r--r-- | sys/vm/vm_page.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c index 8abde96..ff9a227 100644 --- a/sys/vm/vm_page.c +++ b/sys/vm/vm_page.c @@ -1443,9 +1443,13 @@ vm_page_t vm_page_grab(vm_object_t object, vm_pindex_t pindex, int allocflags) { vm_page_t m; - int s, generation; + int s, generation, is_object_locked; - GIANT_REQUIRED; + /* + * Remove is_object_locked after vm_object locking is finished. + */ + if (!(is_object_locked = VM_OBJECT_LOCKED(object))) + GIANT_REQUIRED; retrylookup: if ((m = vm_page_lookup(object, pindex)) != NULL) { vm_page_lock_queues(); @@ -1456,12 +1460,16 @@ retrylookup: while ((object->generation == generation) && (m->busy || (m->flags & PG_BUSY))) { vm_page_flag_set(m, PG_WANTED | PG_REFERENCED); - msleep(m, &vm_page_queue_mtx, PVM, "pgrbwt", 0); + if (is_object_locked) + VM_OBJECT_UNLOCK(object); + msleep(m, &vm_page_queue_mtx, PDROP | PVM, "pgrbwt", 0); + if (is_object_locked) + VM_OBJECT_LOCK(object); if ((allocflags & VM_ALLOC_RETRY) == 0) { - vm_page_unlock_queues(); splx(s); return NULL; } + vm_page_lock_queues(); } vm_page_unlock_queues(); splx(s); @@ -1477,7 +1485,11 @@ retrylookup: m = vm_page_alloc(object, pindex, allocflags & ~VM_ALLOC_RETRY); if (m == NULL) { + if (is_object_locked) + VM_OBJECT_UNLOCK(object); VM_WAIT; + if (is_object_locked) + VM_OBJECT_LOCK(object); if ((allocflags & VM_ALLOC_RETRY) == 0) return NULL; goto retrylookup; |
