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authorNamhyung Kim <namhyung@gmail.com>2011-05-25 04:11:24 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 19:39:06 +0400
commite922c4c5360980bfeb862b3ec307d36bb344dcae (patch)
treee8f4339b198dbb9830ec5313c6cc7ca639704c33 /mm/nommu.c
parentb951bf2c4693bfc9744e11293be859209f65f579 (diff)
downloadlinux-e922c4c5360980bfeb862b3ec307d36bb344dcae.tar.xz
mm: nommu: find vma using the sorted vma list
Now we have the sorted vma list, use it in the find_vma[_exact]() rather than doing linear search on the rb-tree. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Acked-by: Greg Ungerer <gerg@uclinux.org> Cc: David Howells <dhowells@redhat.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
-rw-r--r--mm/nommu.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index 2454d39dc068..e5318f8efde5 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -804,17 +804,15 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma)
struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
{
struct vm_area_struct *vma;
- struct rb_node *n = mm->mm_rb.rb_node;
/* check the cache first */
vma = mm->mmap_cache;
if (vma && vma->vm_start <= addr && vma->vm_end > addr)
return vma;
- /* trawl the tree (there may be multiple mappings in which addr
+ /* trawl the list (there may be multiple mappings in which addr
* resides) */
- for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
- vma = rb_entry(n, struct vm_area_struct, vm_rb);
+ for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (vma->vm_start > addr)
return NULL;
if (vma->vm_end > addr) {
@@ -854,7 +852,6 @@ static struct vm_area_struct *find_vma_exact(struct mm_struct *mm,
unsigned long len)
{
struct vm_area_struct *vma;
- struct rb_node *n = mm->mm_rb.rb_node;
unsigned long end = addr + len;
/* check the cache first */
@@ -862,10 +859,9 @@ static struct vm_area_struct *find_vma_exact(struct mm_struct *mm,
if (vma && vma->vm_start == addr && vma->vm_end == end)
return vma;
- /* trawl the tree (there may be multiple mappings in which addr
+ /* trawl the list (there may be multiple mappings in which addr
* resides) */
- for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
- vma = rb_entry(n, struct vm_area_struct, vm_rb);
+ for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (vma->vm_start < addr)
continue;
if (vma->vm_start > addr)