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Another minor cleanup of the split code. Make sure that pages are

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busied during the entire time, so that the waits for pages being
unbusy don't make the objects inconsistant.
This commit is contained in:
John Dyson 1998-05-02 06:36:16 +00:00
parent b1ad8d9155
commit 86524867d1
1 changed files with 15 additions and 2 deletions
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17
sys/vm/vm_map.c
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@ -61,7 +61,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_map.c,v 1.121 1998/04/29 06:59:08 dyson Exp $
* $Id: vm_map.c,v 1.122 1998/05/01 02:25:29 dyson Exp $
*/
/*
@ -1924,10 +1924,16 @@ vm_map_check_protection(vm_map_t map, vm_offset_t start, vm_offset_t end,
return (TRUE);
}
/*
* Split the pages in a map entry into a new object. This affords
* easier removal of unused pages, and keeps object inheritance from
* being a negative impact on memory usage.
*/
static void
vm_map_split(entry)
vm_map_entry_t entry;
{
vm_page_t m;
vm_object_t orig_object, new_object;
vm_offset_t s, e;
vm_pindex_t offidxstart, offidxend, idx;
@ -1970,7 +1976,7 @@ vm_map_split(entry)
vm_page_protect(m, VM_PROT_NONE);
vm_page_rename(m, new_object, idx);
m->dirty = VM_PAGE_BITS_ALL;
PAGE_WAKEUP(m);
m->flags |= PG_BUSY;
}
if (orig_object->type == OBJT_SWAP) {
@ -1986,6 +1992,13 @@ vm_map_split(entry)
vm_object_pip_wakeup(orig_object);
}
for (idx = 0; idx < size; idx++) {
m = vm_page_lookup(new_object, idx);
if (m) {
PAGE_WAKEUP(m);
}
}
entry->object.vm_object = new_object;
entry->offset = 0LL;
vm_object_deallocate(orig_object);