From: Ravikiran G Thirumalai <kiran@scalex86.org>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org,
"Shai Fultheim (Shai@scalex86.org)" <shai@scalex86.org>
Subject: [patch] Cache align futex hash buckets
Date: Mon, 20 Feb 2006 15:32:42 -0800 [thread overview]
Message-ID: <20060220233242.GC3594@localhost.localdomain> (raw)
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 <kiran@scalex86.org>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
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;
next reply other threads:[~2006-02-20 23:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-20 23:32 Ravikiran G Thirumalai [this message]
2006-02-20 23:33 ` [patch] Cache align futex hash buckets Andrew Morton
2006-02-20 23:34 ` Andrew Morton
2006-02-21 0:09 ` Ravikiran G Thirumalai
2006-02-21 0:23 ` Andrew Morton
2006-02-21 1:04 ` Ravikiran G Thirumalai
2006-02-21 1:09 ` Andrew Morton
2006-02-21 1:39 ` Ravikiran G Thirumalai
2006-02-21 14:44 ` Andi Kleen
2006-02-21 3:30 ` Nick Piggin
2006-02-21 18:33 ` Christoph Lameter
2006-02-21 23:14 ` Christoph Lameter
2006-02-22 0:40 ` Nick Piggin
2006-02-22 2:08 ` Andrew Morton
2006-02-22 2:35 ` Ravikiran G Thirumalai
2006-02-22 2:37 ` Nick Piggin
2006-02-22 20:17 ` Ravikiran G Thirumalai
2006-02-22 20:50 ` Andrew Morton
[not found] ` <20060223015144.GC3663@localhost.localdomain>
2006-02-23 2:08 ` Ravikiran G Thirumalai
2006-02-21 20:20 ` Ravikiran G Thirumalai
2006-02-22 0:45 ` Nick Piggin
2006-02-22 2:09 ` Andrew Morton
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