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More map_simplify fixes from Alan Cox. This very significanly improves the

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performance when the map has been chopped up.  The map simplify operations
really work now.
Reviewed by: dyson
Submitted by:	Alan Cox <alc@cs.rice.edu>
This commit is contained in:
John Dyson 1996-03-28 04:22:17 +00:00
parent 3f0f267e5d
commit f32dbbeeed
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=14864
1 changed files with 28 additions and 29 deletions
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57
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 1.38 1996/03/12 13:46:13 dyson Exp $
* $Id: vm_map.c,v 1.39 1996/03/13 01:18:14 dyson Exp $
*/
/*
@ -850,17 +850,17 @@ vm_map_simplify_entry(map, entry)
prev = entry->prev;
if (prev != &map->header) {
prevsize = prev->end - prev->start;
if ( prev->end == entry->start &&
prev->object.vm_object == entry->object.vm_object &&
prev->offset + prevsize == entry->offset &&
prev->protection == entry->protection &&
prev->max_protection == entry->max_protection &&
prev->inheritance == entry->inheritance &&
prev->needs_copy == entry->needs_copy &&
prev->copy_on_write == entry->copy_on_write &&
prev->is_a_map == FALSE &&
prev->is_sub_map == FALSE &&
prev->wired_count == 0) {
if ( (prev->end == entry->start) &&
(prev->object.vm_object == entry->object.vm_object) &&
(prev->offset + prevsize == entry->offset) &&
(prev->needs_copy == entry->needs_copy) &&
(prev->copy_on_write == entry->copy_on_write) &&
(prev->protection == entry->protection) &&
(prev->max_protection == entry->max_protection) &&
(prev->inheritance == entry->inheritance) &&
(prev->is_a_map == FALSE) &&
(prev->is_sub_map == FALSE) &&
(prev->wired_count == 0)) {
if (map->first_free == prev)
map->first_free = entry;
vm_map_entry_unlink(map, prev);
@ -875,17 +875,17 @@ vm_map_simplify_entry(map, entry)
if (next != &map->header) {
nextsize = next->end - next->start;
esize = entry->end - entry->start;
if (entry->end == next->start &&
next->object.vm_object == entry->object.vm_object &&
entry->offset + esize == next->offset &&
next->protection == entry->protection &&
next->max_protection == entry->max_protection &&
next->inheritance == entry->inheritance &&
next->needs_copy == entry->needs_copy &&
next->copy_on_write == entry->copy_on_write &&
next->is_a_map == FALSE &&
next->is_sub_map == FALSE &&
next->wired_count == 0) {
if ((entry->end == next->start) &&
(next->object.vm_object == entry->object.vm_object) &&
(entry->offset + esize == next->offset) &&
(next->needs_copy == entry->needs_copy) &&
(next->copy_on_write == entry->copy_on_write) &&
(next->protection == entry->protection) &&
(next->max_protection == entry->max_protection) &&
(next->inheritance == entry->inheritance) &&
(next->is_a_map == FALSE) &&
(next->is_sub_map == FALSE) &&
(next->wired_count == 0)) {
if (map->first_free == next)
map->first_free = entry;
vm_map_entry_unlink(map, next);
@ -921,18 +921,14 @@ _vm_map_clip_start(map, entry, start)
{
register vm_map_entry_t new_entry;
/*
* See if we can simplify this entry first
*/
vm_map_simplify_entry(map, entry);
/*
* Split off the front portion -- note that we must insert the new
* entry BEFORE this one, so that this entry has the specified
* starting address.
*/
vm_map_simplify_entry(map, entry);
new_entry = vm_map_entry_create(map);
*new_entry = *entry;
@ -1177,6 +1173,7 @@ vm_map_protect(map, start, end, new_prot, set_max)
current = current->next;
}
vm_map_simplify_entry(map, entry);
vm_map_unlock(map);
return (KERN_SUCCESS);
}
@ -1226,6 +1223,7 @@ vm_map_inherit(map, start, end, new_inheritance)
entry = entry->next;
}
vm_map_simplify_entry(map, temp_entry);
vm_map_unlock(map);
return (KERN_SUCCESS);
}
@ -1313,6 +1311,7 @@ vm_map_pageable(map, start, end, new_pageable)
entry = entry->next;
}
vm_map_simplify_entry(map, start_entry);
lock_clear_recursive(&map->lock);
} else {
/*