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Subject[PATCH 4/5] mm:swap: respect page_cluster for readahead
Date
page_cluster 0 means "we don't want readahead" so in the case,
let's skip the readahead detection logic.

Cc: "Huang, Ying" <ying.huang@intel.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
include/linux/swap.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 0f54b491e118..739d94397c47 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -427,7 +427,8 @@ extern bool has_usable_swap(void);

static inline bool swap_use_vma_readahead(void)
{
- return READ_ONCE(swap_vma_readahead) && !atomic_read(&nr_rotate_swap);
+ return page_cluster > 0 && READ_ONCE(swap_vma_readahead)
+ && !atomic_read(&nr_rotate_swap);
}

/* Swap 50% full? Release swapcache more aggressively.. */
--
2.7.4
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