Following change places each element of the futex_queues hashtable on a
different cacheline. Spinlocks of adjacent hash buckets lie on the same
cacheline otherwise.
Signed-off-by: Ravikiran Thirumalai <[email protected]>
Signed-off-by: Shai Fultheim <[email protected]>
Index: linux-2.6.16-rc2/kernel/futex.c
===================================================================
--- linux-2.6.16-rc2.orig/kernel/futex.c 2006-02-07 23:14:04.000000000 -0800
+++ linux-2.6.16-rc2/kernel/futex.c 2006-02-09 14:04:22.000000000 -0800
@@ -100,9 +100,10 @@ struct futex_q {
struct futex_hash_bucket {
spinlock_t lock;
struct list_head chain;
-};
+} ____cacheline_internodealigned_in_smp;
-static struct futex_hash_bucket futex_queues[1<<FUTEX_HASHBITS];
+static struct futex_hash_bucket futex_queues[1<<FUTEX_HASHBITS]
+ __cacheline_aligned_in_smp;
/* Futex-fs vfsmount entry: */
static struct vfsmount *futex_mnt;
-
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