[PATCH 2/5] mm/readahead: Change the condition for SetPageReadahead
From: <hidden>
Date: 2012-09-22 10:33:41
Subsystem:
memory management, page cache, the rest · Maintainers:
Andrew Morton, Matthew Wilcox, Linus Torvalds
From: Raghavendra D Prabhu <redacted> If page lookup from radix_tree_lookup is successful and its index page_idx == nr_to_read - lookahead_size, then SetPageReadahead never gets called, so this fixes that. Signed-off-by: Raghavendra D Prabhu <redacted> --- mm/readahead.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 461fcc0..fec726c 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c@@ -189,8 +189,10 @@ __do_page_cache_readahead(struct address_space *mapping, struct file *filp, break; page->index = page_offset; list_add(&page->lru, &page_pool); - if (page_idx == nr_to_read - lookahead_size) + if (page_idx >= nr_to_read - lookahead_size) { SetPageReadahead(page); + lookahead_size = 0; + } ret++; }
--
1.7.12.1
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