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Eliminate the redundancy due to the similarity between the routines

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vm_map_simplify and vm_map_simplify_entry.  Make vm_map_simplify_entry
handle wired maps so that we can get rid of vm_map_simplify.  Modify
the callers of vm_map_simplify to properly use vm_map_simplify_entry.
Submitted by:	Alan Cox <alc@cs.rice.edu>
This commit is contained in:
John Dyson 1996-12-28 23:07:49 +00:00
parent 94328e9057
commit b7b2aac2b6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=20993
3 changed files with 18 additions and 84 deletions
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10
sys/vm/vm_kern.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_kern.c,v 1.27 1996/07/02 02:08:02 dyson Exp $
* $Id: vm_kern.c,v 1.28 1996/11/17 02:38:29 dyson Exp $
*/
/*
@ -201,11 +201,6 @@ kmem_alloc(map, size)
(void) vm_map_pageable(map, (vm_offset_t) addr, addr + size, FALSE);
/*
* Try to coalesce the map
*/
vm_map_simplify(map, addr);
return (addr);
}
@ -370,6 +365,8 @@ retry:
panic("kmem_malloc: entry not found or misaligned");
entry->wired_count++;
vm_map_simplify_entry(map, entry);
/*
* Loop thru pages, entering them in the pmap. (We cannot add them to
* the wired count without wrapping the vm_page_queue_lock in
@ -385,7 +382,6 @@ retry:
}
vm_map_unlock(map);
vm_map_simplify(map, addr);
return (addr);
}

89
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 1.61 1996/12/07 07:44:05 dyson Exp $
* $Id: vm_map.c,v 1.62 1996/12/14 17:54:15 dyson Exp $
*/
/*
@ -153,6 +153,7 @@ vm_size_t kentry_data_size;
static vm_map_entry_t kentry_free;
static vm_map_t kmap_free;
extern char kstack[];
extern int inmprotect;
static int kentry_count;
static vm_offset_t mapvm_start, mapvm, mapvmmax;
@ -170,7 +171,6 @@ static void vm_map_entry_dispose __P((vm_map_t, vm_map_entry_t));
static void vm_map_entry_unwire __P((vm_map_t, vm_map_entry_t));
static void vm_map_copy_entry __P((vm_map_t, vm_map_t, vm_map_entry_t,
vm_map_entry_t));
static void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t));
void
vm_map_startup()
@ -849,28 +849,19 @@ vm_map_find(map, object, offset, addr, length, find_space, prot, max, cow)
}
/*
* vm_map_simplify_entry: [ internal use only ]
* vm_map_simplify_entry:
*
* Simplify the given map entry by:
* removing extra sharing maps
* [XXX maybe later] merging with a neighbor
* Simplify the given map entry by merging with either neighbor.
*/
static void
void
vm_map_simplify_entry(map, entry)
vm_map_t map;
vm_map_entry_t entry;
{
vm_map_entry_t next, prev;
vm_size_t nextsize, prevsize, esize;
vm_size_t prevsize, esize;
/*
* If this entry corresponds to a sharing map, then see if we can
* remove the level of indirection. If it's not a sharing map, then it
* points to a VM object, so see if we can merge with either of our
* neighbors.
*/
if (entry->is_sub_map || entry->is_a_map || entry->wired_count)
if (entry->is_sub_map || entry->is_a_map)
return;
prev = entry->prev;
@ -888,7 +879,7 @@ vm_map_simplify_entry(map, entry)
(prev->inheritance == entry->inheritance) &&
(prev->is_a_map == FALSE) &&
(prev->is_sub_map == FALSE) &&
(prev->wired_count == 0)) {
(prev->wired_count == entry->wired_count)) {
if (map->first_free == prev)
map->first_free = entry;
if (map->hint == prev)
@ -904,7 +895,6 @@ vm_map_simplify_entry(map, entry)
next = entry->next;
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) &&
@ -918,7 +908,7 @@ vm_map_simplify_entry(map, entry)
(next->inheritance == entry->inheritance) &&
(next->is_a_map == FALSE) &&
(next->is_sub_map == FALSE) &&
(next->wired_count == 0)) {
(next->wired_count == entry->wired_count)) {
if (map->first_free == next)
map->first_free = entry;
if (map->hint == next)
@ -1117,8 +1107,9 @@ vm_map_protect(map, start, end, new_prot, set_max)
if (vm_map_lookup_entry(map, start, &entry)) {
vm_map_clip_start(map, entry, start);
} else
} else {
entry = entry->next;
}
/*
* Make a first pass to check for protection violations.
@ -1710,6 +1701,7 @@ vm_map_pageable(map, start, end, new_pageable)
(void) vm_map_pageable(map, start, failed, TRUE);
return (rv);
}
vm_map_simplify_entry(map, start_entry);
}
vm_map_unlock(map);
@ -2296,6 +2288,7 @@ RetryLookup:;
entry = tmp_entry;
*out_entry = entry;
}
/*
* Handle submaps.
*/
@ -2466,62 +2459,6 @@ vm_map_lookup_done(map, entry)
vm_map_unlock_read(map);
}
/*
* Routine: vm_map_simplify
* Purpose:
* Attempt to simplify the map representation in
* the vicinity of the given starting address.
* Note:
* This routine is intended primarily to keep the
* kernel maps more compact -- they generally don't
* benefit from the "expand a map entry" technology
* at allocation time because the adjacent entry
* is often wired down.
*/
void
vm_map_simplify(map, start)
vm_map_t map;
vm_offset_t start;
{
vm_map_entry_t this_entry;
vm_map_entry_t prev_entry;
vm_map_lock(map);
if ((vm_map_lookup_entry(map, start, &this_entry)) &&
((prev_entry = this_entry->prev) != &map->header) &&
(prev_entry->end == start) &&
(prev_entry->object.vm_object == this_entry->object.vm_object) &&
((prev_entry->offset + (prev_entry->end - prev_entry->start))
== this_entry->offset) &&
(map->is_main_map) &&
(prev_entry->is_a_map == FALSE) &&
(prev_entry->is_sub_map == FALSE) &&
(this_entry->is_a_map == FALSE) &&
(this_entry->is_sub_map == FALSE) &&
(prev_entry->inheritance == this_entry->inheritance) &&
(prev_entry->protection == this_entry->protection) &&
(prev_entry->max_protection == this_entry->max_protection) &&
(prev_entry->wired_count == this_entry->wired_count) &&
(prev_entry->copy_on_write == this_entry->copy_on_write) &&
(prev_entry->needs_copy == this_entry->needs_copy)) {
if (map->first_free == this_entry)
map->first_free = prev_entry;
if (map->hint == this_entry)
SAVE_HINT(map, prev_entry);
vm_map_entry_unlink(map, this_entry);
prev_entry->end = this_entry->end;
if (this_entry->object.vm_object)
vm_object_deallocate(this_entry->object.vm_object);
vm_map_entry_dispose(map, this_entry);
}
vm_map_unlock(map);
}
#include "opt_ddb.h"
#ifdef DDB
#include <sys/kernel.h>

3
sys/vm/vm_map.h
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.h,v 1.17 1996/12/07 00:03:43 dyson Exp $
* $Id: vm_map.h,v 1.18 1996/12/14 17:54:16 dyson Exp $
*/
/*
@ -247,6 +247,7 @@ void vm_map_simplify __P((vm_map_t, vm_offset_t));
void vm_map_startup __P((void));
int vm_map_submap __P((vm_map_t, vm_offset_t, vm_offset_t, vm_map_t));
void vm_map_madvise __P((vm_map_t, pmap_t, vm_offset_t, vm_offset_t, int));
void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t));
#endif
#endif /* _VM_MAP_ */