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 V2 0/4] this_cpu_cmpxchg_double support
Date: Thu, 06 Jan 2011 14:45:13 -0600 [thread overview]
Message-ID: <20110106204513.669098445@linux.com> (raw)
This patch series introduces this_cpu_cmpxchg_double().
x86 cpus support cmpxchg16b and cmpxchg8b instuction which are capable of
switching two words instead of one during a cmpxchg.
Two words allow to swap more state in an atomic instruction.
this_cpu_cmpxchg_double() is 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. Using the new operation significantly speeds up the fastpaths.
V1->V2
- Change parameter convention for this_cpu_cmpxchg_double. Specify both
percpu variables in same way as the two old and new values.
- Do not require a per cpu pointer but a variable to conform to the
convention used in other this_cpu_ops.
next reply other threads:[~2011-01-06 20:45 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-06 20:45 Christoph Lameter [this message]
2011-01-06 20:45 ` [cpuops cmpxchg double V2 1/4] Generic support for this_cpu_cmpxchg_double Christoph Lameter
2011-01-06 21:08 ` Mathieu Desnoyers
2011-01-06 21:43 ` Christoph Lameter
2011-01-06 22:05 ` H. Peter Anvin
2011-01-07 15:15 ` Christoph Lameter
2011-01-07 18:04 ` Mathieu Desnoyers
2011-01-07 18:41 ` Christoph Lameter
2011-01-08 17:24 ` Tejun Heo
2011-01-09 8:33 ` Pekka Enberg
2011-01-21 7:31 ` Pekka Enberg
2011-01-21 9:26 ` Tejun Heo
2011-01-21 15:31 ` H. Peter Anvin
2011-01-21 15:48 ` Tejun Heo
2011-01-21 16:30 ` H. Peter Anvin
2011-01-21 16:34 ` Tejun Heo
2011-01-21 16:54 ` Mathieu Desnoyers
2011-01-21 17:07 ` Christoph Lameter
2011-01-21 17:50 ` Mathieu Desnoyers
2011-01-21 18:06 ` Christoph Lameter
2011-01-21 18:37 ` Mathieu Desnoyers
2011-01-21 17:08 ` Tejun Heo
2011-01-21 17:13 ` H. Peter Anvin
2011-01-21 17:19 ` Tejun Heo
2011-01-24 6:01 ` H. Peter Anvin
2011-02-25 13:09 ` Pekka Enberg
2011-02-25 13:19 ` Tejun Heo
2011-02-25 16:26 ` Christoph Lameter
2011-02-25 16:37 ` Tejun Heo
2011-02-25 16:43 ` Christoph Lameter
2011-02-25 16:38 ` Eric Dumazet
2011-02-25 16:45 ` Christoph Lameter
2011-01-21 17:24 ` Christoph Lameter
2011-01-21 17:42 ` Mathieu Desnoyers
2011-01-21 17:50 ` Christoph Lameter
2011-01-21 18:10 ` Mathieu Desnoyers
2011-01-21 18:42 ` Christoph Lameter
2011-01-21 18:31 ` H. Peter Anvin
2011-01-21 18:46 ` Christoph Lameter
2011-01-21 19:32 ` Mathieu Desnoyers
2011-01-23 18:00 ` H. Peter Anvin
2011-01-06 20:45 ` [cpuops cmpxchg double V2 2/4] x86: this_cpu_cmpxchg_double() support Christoph Lameter
2011-01-06 20:45 ` [cpuops cmpxchg double V2 3/4] slub: Get rid of slab_free_hook_irq() Christoph Lameter
2011-01-06 20:45 ` [cpuops cmpxchg double V2 4/4] Lockless (and preemptless) fastpaths for slub Christoph Lameter
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