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Reenable the call to vm_map_simplify_entry() from vm_map_insert() for non-

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MAP_STACK_* entries.  (See r71983 and r74235.)

In some cases, performing this call to vm_map_simplify_entry() halves the
number of vm map entries used by the Sun JDK.
This commit is contained in:
Alan Cox 2011-01-29 15:23:02 +00:00
parent 1e918679c6
commit d2a444c0da
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=218070
1 changed files with 5 additions and 9 deletions
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12
sys/vm/vm_map.c
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@ -1293,17 +1293,13 @@ vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
vm_map_entry_link(map, prev_entry, new_entry);
map->size += new_entry->end - new_entry->start;
#if 0
/*
* Temporarily removed to avoid MAP_STACK panic, due to
* MAP_STACK being a huge hack. Will be added back in
* when MAP_STACK (and the user stack mapping) is fixed.
*/
/*
* It may be possible to simplify the entry
* It may be possible to merge the new entry with the next and/or
* previous entries. However, due to MAP_STACK_* being a hack, a
* panic can result from merging such entries.
*/
if ((cow & (MAP_STACK_GROWS_DOWN | MAP_STACK_GROWS_UP)) == 0)
vm_map_simplify_entry(map, new_entry);
#endif
if (cow & (MAP_PREFAULT|MAP_PREFAULT_PARTIAL)) {
vm_map_pmap_enter(map, start, prot,