From: Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>
page_cache_sync_readahead checks for ra->ra_pages again, so moving the check
after VM_SequentialReadHint.
Signed-off-by: Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>
---
mm/filemap.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 3843445..606a648 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1523,8 +1523,6 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
/* If we don't want any read-ahead, don't bother */
if (VM_RandomReadHint(vma))
return;
- if (!ra->ra_pages)
- return;
if (VM_SequentialReadHint(vma)) {
page_cache_sync_readahead(mapping, ra, file, offset,
@@ -1532,6 +1530,9 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
return;
}
+ if (!ra->ra_pages)
+ return;
+
/* Avoid banging the cache line if not needed */
if (ra->mmap_miss < MMAP_LOTSAMISS * 10)
ra->mmap_miss++;
--
1.7.12.1
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