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| author | Namhyung Kim <namhyung@gmail.com> | 2011-05-24 17:11:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:39:06 -0700 |
| commit | e922c4c5360980bfeb862b3ec307d36bb344dcae (patch) | |
| tree | e8f4339b198dbb9830ec5313c6cc7ca639704c33 /mm/nommu.c | |
| parent | b951bf2c4693bfc9744e11293be859209f65f579 (diff) | |
| download | lwn-e922c4c5360980bfeb862b3ec307d36bb344dcae.tar.gz lwn-e922c4c5360980bfeb862b3ec307d36bb344dcae.zip | |
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.c | 12 |
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) |