diff options
| author | alc <alc@FreeBSD.org> | 2003-06-21 06:31:42 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2003-06-21 06:31:42 +0000 |
| commit | ed79b4d6257cb411589c447a07a268c99e8b345d (patch) | |
| tree | 32cbd2da12ff9833e297fb9c1da08abd66667dd5 /sys/vm | |
| parent | 0303355ccc1c33ff898663363f9804209b0593ef (diff) | |
| download | FreeBSD-src-ed79b4d6257cb411589c447a07a268c99e8b345d.zip FreeBSD-src-ed79b4d6257cb411589c447a07a268c99e8b345d.tar.gz | |
Lock one of the vm objects involved in an optimized copy-on-write fault.
Diffstat (limited to 'sys/vm')
| -rw-r--r-- | sys/vm/vm_fault.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c index cc138c3..fcb2426 100644 --- a/sys/vm/vm_fault.c +++ b/sys/vm/vm_fault.c @@ -196,7 +196,7 @@ vm_fault(vm_map_t map, vm_offset_t vaddr, vm_prot_t fault_type, int fault_flags) { vm_prot_t prot; - int result; + int is_first_object_locked, result; boolean_t growstack, wired; int map_generation; vm_object_t next_object; @@ -683,6 +683,7 @@ readrest: * dirty in the first object so that it will go out * to swap when needed. */ + is_first_object_locked = FALSE; if ( /* * Only one shadow object @@ -701,6 +702,7 @@ readrest: */ ((fs.object->type == OBJT_DEFAULT) || (fs.object->type == OBJT_SWAP)) && + (is_first_object_locked = VM_OBJECT_TRYLOCK(fs.first_object)) && /* * We don't chase down the shadow chain */ @@ -730,7 +732,8 @@ readrest: */ vm_page_copy(fs.m, fs.first_m); } - + if (is_first_object_locked) +/*XXX*/ VM_OBJECT_UNLOCK(fs.first_object); if (fs.m) { /* * We no longer need the old page or object. |
