From: Pekka Enberg <penberg@cs.helsinki.fi>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Tejun Heo <tj@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Christoph Lameter <cl@linux.com>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [cpuops cmpxchg double V2 1/4] Generic support for this_cpu_cmpxchg_double
Date: Fri, 25 Feb 2011 15:09:26 +0200 [thread overview]
Message-ID: <4D67AA06.5090200@cs.helsinki.fi> (raw)
In-Reply-To: <4D3D15AF.30508@zytor.com>
On Fri, Jan 21, 2011 at 09:13:41AM -0800, H. Peter Anvin wrote:
>>> We could do cmpxchg with a structure... the problem with a lon int
>>> type is that Cristoph ran into bugs with __int128 on 64 bits.
On 01/21/2011 09:19 AM, Tejun Heo wrote:
>> But, IIRC, the problem with int128 was with passing it as parameter
>> and return value. We don't have to do that. We'll be just using it
>> as a data storage / container type. Or even that is broken?
On 1/24/11 8:01 AM, H. Peter Anvin wrote:
> Well, part of the point was to pass in registers.
>
> No idea on the data storage type.
Ping? The current situation is that we're unable to merge a perfectly
good SLUB performance optimization because we can't seem to agree on the
this_cpu_cmpxchg_double() API.
Pekka
next prev parent reply other threads:[~2011-02-25 13:09 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-06 20:45 [cpuops cmpxchg double V2 0/4] this_cpu_cmpxchg_double support Christoph Lameter
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 [this message]
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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