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| author | attilio <attilio@FreeBSD.org> | 2012-07-11 01:04:59 +0000 |
|---|---|---|
| committer | attilio <attilio@FreeBSD.org> | 2012-07-11 01:04:59 +0000 |
| commit | 74cb07ed813fc1f1be50beccddabbf364f38d296 (patch) | |
| tree | f66b08b292963a852a7f235080f6350481fb3270 /sys/vm/vm_object.c | |
| parent | cd114c7451665121d4e5e6ff92d35dcd4f6d76f1 (diff) | |
| download | FreeBSD-src-74cb07ed813fc1f1be50beccddabbf364f38d296.zip FreeBSD-src-74cb07ed813fc1f1be50beccddabbf364f38d296.tar.gz | |
Document the object type movements, related to swp_pager_copy(),
in vm_object_collapse() and vm_object_split().
In collabouration with: alc
MFC after: 3 days
Diffstat (limited to 'sys/vm/vm_object.c')
| -rw-r--r-- | sys/vm/vm_object.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c index 881c344..7ff561d 100644 --- a/sys/vm/vm_object.c +++ b/sys/vm/vm_object.c @@ -1381,6 +1381,12 @@ retry: /* * Transfer any cached pages from orig_object to new_object. + * If swap_pager_copy() found swapped out pages within the + * specified range of orig_object, then it changed + * new_object's type to OBJT_SWAP when it transferred those + * pages to new_object. Otherwise, new_object's type + * should still be OBJT_DEFAULT and orig_object should not + * contain any cached pages within the specified range. */ if (__predict_false(orig_object->cache != NULL)) vm_page_cache_transfer(orig_object, offidxstart, @@ -1719,6 +1725,9 @@ vm_object_collapse(vm_object_t object) * swap_pager_copy() can sleep, in which case * the backing_object's and object's locks are * released and reacquired. + * Since swap_pager_copy() is being asked to + * destroy the source, it will change the + * backing_object's type to OBJT_DEFAULT. */ swap_pager_copy( backing_object, |
