d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=35615
1 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
sys/vm/vm_map.c
View File

@ -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);