From: Christoph Lameter <cl@linux.com>
To: Tejun Heo <tj@kernel.org>
Cc: akpm@linux-foundation.org
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: linux-kernel@vger.kernel.org
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: [cpuops cmpxchg double V1 0/4] this_cpu_cmpxchg_double support
Date: Tue, 14 Dec 2010 11:48:47 -0600 [thread overview]
Message-ID: <20101214174847.887713690@linux.com> (raw)
This patch series introduces this_cpu_cmpxchg_double().
x86 cpus support cmpxchg16b and cmpxchg8b that can be used to perform a
cmpxchg with two words instead of only one. That allows to put more state
into an atomic instruction.
this_cpu_cmpxchg_double() is then used in the slub allocator to avoid
interrupt disable/enable in both alloc and free fastpath.
this_cpu_cmpxchg_double works nicely with the per cpu data of the
allocator. Doing so significantly speeds up the fastpaths.
next reply other threads:[~2010-12-14 17:49 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-14 17:48 Christoph Lameter [this message]
2010-12-14 17:48 ` [cpuops cmpxchg double V1 1/4] Generic support for this_cpu_cmpxchg_double Christoph Lameter
2010-12-18 14:47 ` Tejun Heo
2010-12-18 14:51 ` Tejun Heo
2010-12-21 22:36 ` Christoph Lameter
2010-12-21 23:24 ` H. Peter Anvin
2010-12-22 9:14 ` Tejun Heo
2010-12-24 0:16 ` Christoph Lameter
2010-12-24 0:22 ` H. Peter Anvin
2010-12-25 4:53 ` Christoph Lameter
2010-12-25 6:11 ` H. Peter Anvin
2010-12-25 16:52 ` Tejun Heo
2010-12-25 23:55 ` Christoph Lameter
2010-12-27 10:52 ` Tejun Heo
2011-01-03 22:43 ` Christoph Lameter
2010-12-14 17:48 ` [cpuops cmpxchg double V1 2/4] x86: this_cpu_cmpxchg_double() support Christoph Lameter
2010-12-15 0:46 ` H. Peter Anvin
2010-12-15 0:56 ` H. Peter Anvin
2010-12-15 16:12 ` Christoph Lameter
2010-12-15 16:20 ` Christoph Lameter
2010-12-15 17:36 ` H. Peter Anvin
2010-12-15 17:53 ` Christoph Lameter
2010-12-15 16:32 ` H. Peter Anvin
2010-12-15 16:41 ` Christoph Lameter
2010-12-14 17:48 ` [cpuops cmpxchg double V1 3/4] slub: Get rid of slab_free_hook_irq() Christoph Lameter
2010-12-14 17:48 ` [cpuops cmpxchg double V1 4/4] Lockless (and preemptless) fastpaths for slub Christoph Lameter
2010-12-15 16:51 ` Tejun Heo
2010-12-15 16:55 ` Pekka Enberg
2010-12-15 16:57 ` Tejun Heo
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