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 V3 0/5] this_cpu_cmpxchg_double support
Date: Fri, 25 Feb 2011 11:38:50 -0600 [thread overview]
Message-ID: <20110225173850.486326452@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.
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.
V2->V3:
- Do not use CONFIG_DEBUG_VM to enable cmpxchg diagnostics. Use
custom SLUB define instead.
- Add patch to move min_partial into a different cacheline.
- Rediff
next reply other threads:[~2011-02-25 17:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-25 17:38 Christoph Lameter [this message]
2011-02-25 17:38 ` [cpuops cmpxchg double V3 1/5] slub: min_partial needs to be in first cacheline Christoph Lameter
2011-02-25 17:38 ` [cpuops cmpxchg double V3 2/5] slub: Get rid of slab_free_hook_irq() Christoph Lameter
2011-02-25 18:23 ` Mathieu Desnoyers
2011-02-25 17:38 ` [cpuops cmpxchg double V3 3/5] Generic support for this_cpu_cmpxchg_double Christoph Lameter
2011-02-25 18:25 ` Mathieu Desnoyers
2011-02-25 20:28 ` Steven Rostedt
2011-02-25 20:44 ` Christoph Lameter
2011-02-25 20:53 ` Steven Rostedt
2011-02-25 20:58 ` Christoph Lameter
2011-02-25 21:01 ` Steven Rostedt
2011-02-28 10:22 ` [PATCH] percpu: Generic support for this_cpu_cmpxchg_double() this_cpu_cmpxchg_double Tejun Heo
2011-02-25 17:38 ` [cpuops cmpxchg double V3 4/5] Lockless (and preemptless) fastpaths for slub Christoph Lameter
2011-02-25 18:21 ` Mathieu Desnoyers
2011-02-25 20:46 ` Christoph Lameter
2011-02-25 20:56 ` Mathieu Desnoyers
2011-02-25 17:38 ` [cpuops cmpxchg double V3 5/5] x86: this_cpu_cmpxchg_double() support Christoph Lameter
2011-02-28 10:23 ` [PATCH] percpu, x86: Add arch-specific " Tejun Heo
2011-02-28 10:36 ` [cpuops cmpxchg double V3 0/5] this_cpu_cmpxchg_double support Tejun Heo
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