From: Tejun Heo <tj@kernel.org>
To: cl@linux-foundation.org
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
mingo@elte.hu, rusty@rustcorp.com.au,
Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [this_cpu_xx V4 02/20] this_cpu: X86 optimized this_cpu operations
Date: Fri, 02 Oct 2009 18:18:42 +0900 [thread overview]
Message-ID: <4AC5C572.9040309@kernel.org> (raw)
In-Reply-To: <20091001212557.963565363@gentwo.org>
cl@linux-foundation.org wrote:
> Basically the existing percpu ops can be used for this_cpu variants that allow
> operations also on dynamically allocated percpu data. However, we do not pass a
> reference to a percpu variable in. Instead a dynamically or statically
> allocated percpu variable is provided.
>
> Preempt, the non preempt and the irqsafe operations generate the same code.
> It will always be possible to have the requires per cpu atomicness in a single
> RMW instruction with segment override on x86.
>
> 64 bit this_cpu operations are not supported on 32 bit.
>
> Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Acked-by: Tejun Heo <tj@kernel.org>
--
tejun
next prev parent reply other threads:[~2009-10-02 9:19 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-01 21:25 [this_cpu_xx V4 00/20] Introduce per cpu atomic operations and avoid per cpu address arithmetic cl
2009-10-01 21:25 ` [this_cpu_xx V4 01/20] Introduce this_cpu_ptr() and generic this_cpu_* operations cl
2009-10-02 9:16 ` Tejun Heo
2009-10-02 9:34 ` Ingo Molnar
2009-10-02 17:11 ` Christoph Lameter
2009-10-06 10:04 ` Rusty Russell
2009-10-06 23:39 ` Christoph Lameter
2009-10-06 23:55 ` Tejun Heo
2009-10-08 17:57 ` [Patchs vs. percpu-next] Use this_cpu_xx to dynamically allocate counters Christoph Lameter
2009-10-13 11:51 ` Rusty Russell
2009-10-08 18:06 ` Christoph Lameter
2009-10-01 21:25 ` [this_cpu_xx V4 02/20] this_cpu: X86 optimized this_cpu operations cl
2009-10-02 9:18 ` Tejun Heo [this message]
2009-10-02 9:59 ` Ingo Molnar
2009-10-03 19:33 ` Pekka Enberg
2009-10-04 16:47 ` Ingo Molnar
2009-10-04 16:51 ` Pekka Enberg
2009-10-01 21:25 ` [this_cpu_xx V4 03/20] Use this_cpu operations for SNMP statistics cl
2009-10-01 21:25 ` [this_cpu_xx V4 04/20] Use this_cpu operations for NFS statistics cl
2009-10-01 21:25 ` [this_cpu_xx V4 05/20] use this_cpu ops for network statistics cl
2009-10-01 21:25 ` [this_cpu_xx V4 06/20] this_cpu_ptr: Straight transformations cl
2009-10-01 21:25 ` [this_cpu_xx V4 07/20] this_cpu_ptr: Eliminate get/put_cpu cl
2009-10-01 21:25 ` [this_cpu_xx V4 08/20] this_cpu_ptr: xfs_icsb_modify_counters does not need "cpu" variable cl
2009-10-01 21:25 ` [this_cpu_xx V4 09/20] Use this_cpu_ptr in crypto subsystem cl
2009-10-01 21:25 ` [this_cpu_xx V4 10/20] Use this_cpu ops for VM statistics cl
2009-10-01 21:25 ` [this_cpu_xx V4 11/20] RCU: Use this_cpu operations cl
2009-10-03 10:52 ` Tejun Heo
2009-10-01 21:25 ` [this_cpu_xx V4 12/20] Move early initialization of pagesets out of zone_wait_table_init() cl
2009-10-02 14:16 ` Mel Gorman
2009-10-02 17:30 ` Christoph Lameter
2009-10-05 9:35 ` Mel Gorman
2009-10-03 10:29 ` Tejun Heo
2009-10-05 14:39 ` Christoph Lameter
2009-10-05 15:01 ` Tejun Heo
2009-10-05 15:06 ` Christoph Lameter
2009-10-05 15:21 ` Tejun Heo
2009-10-05 15:28 ` Christoph Lameter
2009-10-05 15:41 ` Tejun Heo
2009-10-05 15:39 ` Christoph Lameter
2009-10-01 21:25 ` [this_cpu_xx V4 13/20] this_cpu_ops: page allocator conversion cl
2009-10-02 15:14 ` Mel Gorman
2009-10-02 17:39 ` Christoph Lameter
2009-10-05 9:45 ` Mel Gorman
2009-10-05 14:43 ` Christoph Lameter
2009-10-05 14:55 ` Christoph Lameter
2009-10-06 9:45 ` Mel Gorman
2009-10-06 16:34 ` Christoph Lameter
2009-10-06 17:03 ` Mel Gorman
2009-10-06 17:51 ` Christoph Lameter
2009-10-06 18:36 ` Mel Gorman
2009-10-06 19:06 ` Christoph Lameter
2009-10-07 10:42 ` Mel Gorman
2009-10-01 21:25 ` [this_cpu_xx V4 14/20] this_cpu ops: Remove pageset_notifier cl
2009-10-01 21:25 ` [this_cpu_xx V4 15/20] Use this_cpu operations in slub cl
2009-10-01 21:25 ` [this_cpu_xx V4 16/20] SLUB: Get rid of dynamic DMA kmalloc cache allocation cl
2009-10-01 21:25 ` [this_cpu_xx V4 17/20] this_cpu: Remove slub kmem_cache fields cl
2009-10-01 21:25 ` [this_cpu_xx V4 18/20] Make slub statistics use this_cpu_inc cl
2009-10-01 21:25 ` [this_cpu_xx V4 19/20] this_cpu: slub aggressive use of this_cpu operations in the hotpaths cl
2009-10-01 21:25 ` [this_cpu_xx V4 20/20] SLUB: Experimental new fastpath w/o interrupt disable cl
2009-10-02 9:30 ` [this_cpu_xx V4 00/20] Introduce per cpu atomic operations and avoid per cpu address arithmetic Tejun Heo
2009-10-02 9:54 ` Ingo Molnar
2009-10-02 17:15 ` Christoph Lameter
2009-10-02 17:32 ` Ingo Molnar
2009-10-02 17:49 ` Christoph Lameter
2009-10-02 17:10 ` Christoph Lameter
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