From: James Bottomley <James.bottomley@HansenPartnership.com>
To: Christoph Lameter <cl@linux.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Greg Thelen <gthelen@google.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Balbir Singh <bsingharora@gmail.com>,
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
linux-arch@vger.kernel.org
Subject: Re: [PATCH] memcg: remove unneeded preempt_disable
Date: Thu, 25 Aug 2011 11:34:34 -0700 [thread overview]
Message-ID: <1e295500-5d1f-45dd-aa5b-3d2da2cf1a62@email.android.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1108251206440.27407@router.home>
Christoph Lameter <cl@linux.com> wrote:
>On Thu, 25 Aug 2011, James Bottomley wrote:
>
>> >ARM seems to have these LDREX/STREX instructions for that purpose
>which
>> >seem to be used for generating atomic instructions without lockes. I
>> >guess
>> >other RISC architectures have similar means of doing it?
>>
>> Arm isn't really risc. Most don't. However even with ldrex/strex
>you need two instructions for rmw.
>
>Well then what is "really risc"? RISC is an old beaten down marketing
>term
>AFAICT and ARM claims it too.
Reduced Instruction Set Computer. This is why we're unlikely to have complex atomic instructions: the principle of risc is that you build them up from basic ones.
James
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next prev parent reply other threads:[~2011-08-25 18:34 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-18 6:50 Greg Thelen
2011-08-18 6:52 ` KAMEZAWA Hiroyuki
2011-08-18 9:38 ` Johannes Weiner
2011-08-18 14:26 ` Valdis.Kletnieks
2011-08-18 14:41 ` Johannes Weiner
2011-08-18 18:27 ` Valdis.Kletnieks
2011-08-18 21:40 ` Andrew Morton
2011-08-19 0:00 ` Greg Thelen
2011-08-25 14:57 ` Peter Zijlstra
2011-08-25 15:11 ` Christoph Lameter
2011-08-25 16:20 ` James Bottomley
2011-08-25 16:31 ` Christoph Lameter
2011-08-25 16:34 ` James Bottomley
2011-08-25 17:07 ` Christoph Lameter
2011-08-25 18:34 ` James Bottomley [this message]
2011-08-25 18:46 ` Christoph Lameter
2011-08-25 18:49 ` Peter Zijlstra
2011-08-25 18:53 ` Peter Zijlstra
2011-08-25 19:05 ` Peter Zijlstra
2011-08-25 19:19 ` Christoph Lameter
2011-08-25 22:56 ` Peter Zijlstra
2011-08-25 19:29 ` James Bottomley
2011-08-25 23:01 ` Peter Zijlstra
2011-08-25 18:40 ` Peter Zijlstra
2011-09-06 9:58 ` Johannes Weiner
2011-09-06 10:04 ` KAMEZAWA Hiroyuki
2011-09-06 10:49 ` Johannes Weiner
2011-09-06 10:45 ` KAMEZAWA Hiroyuki
2011-09-06 18:04 ` Greg Thelen
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