From caca7cb748571a5b39943a9b3e7081feef055e5e Mon Sep 17 00:00:00 2001 From: Wu Fengguang <fengguang.wu@intel.com> Date: Tue, 16 Jun 2009 15:31:21 -0700 Subject: [PATCH] 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> --- mm/readahead.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/readahead.c b/mm/readahead.c index bd0f0e88b0a1..56731158309b 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)