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authorWu Fengguang <fengguang.wu@intel.com>2009-06-16 15:31:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 19:47:28 -0700
commitcaca7cb748571a5b39943a9b3e7081feef055e5e (patch)
tree8f115031584d8ebc14280079fed8183ef1f032ac
parentfc31d16add13773265cc53d59f2e7594cb3c0a14 (diff)
downloadop-kernel-dev-caca7cb748571a5b39943a9b3e7081feef055e5e.zip
op-kernel-dev-caca7cb748571a5b39943a9b3e7081feef055e5e.tar.gz
readahead: remove one unnecessary radix tree lookup
(hit_readahead_marker != 0) means the page at @offset is present, so we can search for non-present page starting from @offset+1. Reported-by: Xu Chenfeng <xcf@ustc.edu.cn> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Ying Han <yinghan@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/readahead.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/readahead.c b/mm/readahead.c
index bd0f0e8..5673115 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -395,7 +395,7 @@ ondemand_readahead(struct address_space *mapping,
pgoff_t start;
rcu_read_lock();
- start = radix_tree_next_hole(&mapping->page_tree, offset,max+1);
+ start = radix_tree_next_hole(&mapping->page_tree, offset+1,max);
rcu_read_unlock();
if (!start || start - offset > max)
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