linux-kernel - Re: [PATCH] memcg: remove unneeded preempt

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Date:	Thu, 25 Aug 2011 12:07:44 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	James Bottomley <James.bottomley@...senPartnership.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Thelen <gthelen@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <bsingharora@...il.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH] memcg: remove unneeded preempt_disable

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.

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