---
Change log:
Change the hash operation from division to shift. It will cost less time.
Also, I change the divisor from L1_CACHE_BYTES to L1_CACHE_SHIFT.
In the cache.h, the most L1_CACHE_BYTES defined as "(1 << L1_CACHE_SHIFT)".
---
Signed-off-by: Liuwenyi<qingshenlwy@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
diff --git a/fs/inode.c b/fs/inode.c
index 4d8e3be..397d65f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -605,8 +605,8 @@ static unsigned long hash(struct super_block *sb, unsigned long hashval)
{
unsigned long tmp;
- tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /
- L1_CACHE_BYTES;
+ tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) >>
+ L1_CACHE_SHIFT;
tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> I_HASHBITS);
return tmp & I_HASHMASK;
}
--------------
Best Regards,
Liuweni
2009-11-25
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