arch/powerpc: Optimize cell spu task sync.

Use the vma api to look up the spu reference instead of walking the linked list.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>

diff --git a/arch/powerpc/oprofile/cell/spu_task_sync.c b/arch/powerpc/oprofile/cell/spu_task_sync.c
index 489f993100d56c1a342113626b05b7bb27077b12..47b4d4e9b628d1580c2286fb9d20ba4d93cca9db 100644 (file)
--- a/arch/powerpc/oprofile/cell/spu_task_sync.c
+++ b/arch/powerpc/oprofile/cell/spu_task_sync.c
@@ -333,19 +333,17 @@ get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
        }
 
        mmap_read_lock(mm);
-       for (vma = mm->mmap; vma; vma = vma->vm_next) {
-               if (vma->vm_start > spu_ref || vma->vm_end <= spu_ref)
-                       continue;
-               my_offset = spu_ref - vma->vm_start;
-               if (!vma->vm_file)
-                       goto fail_no_image_cookie;
-
-               pr_debug("Found spu ELF at %X(object-id:%lx) for file %pD\n",
-                        my_offset, spu_ref, vma->vm_file);
-               *offsetp = my_offset;
-               break;
-       }
+       vma = find_vma_intersection(mm, spu_ref, spu_ref + 1);
+       if (!vma)
+               goto fail_no_image_cookie;
+
+       my_offset = spu_ref - vma->vm_start;
+       if (!vma->vm_file)
+               goto fail_no_image_cookie;
 
+       pr_debug("Found spu ELF at %X(object-id:%lx) for file %pD\n",
+                my_offset, spu_ref, vma->vm_file);
+       *offsetp = my_offset;
        *spu_bin_dcookie = fast_get_dcookie(&vma->vm_file->f_path);
        pr_debug("got dcookie for %pD\n", vma->vm_file);