linux-kernel - Re: [patch] add optimized generic percpu accessors

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Message-ID: <20090115130740.GE21839@elte.hu>
Date:	Thu, 15 Jan 2009 14:07:40 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Brian Gerst <brgerst@...il.com>,
	ebiederm@...ssion.com, cl@...ux-foundation.org,
	rusty@...tcorp.com.au, travis@....com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	steiner@....com, hugh@...itas.com
Subject: Re: [patch] add optimized generic percpu accessors


* Tejun Heo <tj@...nel.org> wrote:

> It is an optimization and a cleanup, and adds the following new
> generic percpu methods:
> 
>   percpu_read()
>   percpu_write()
>   percpu_add()
>   percpu_sub()
>   percpu_or() 
>   percpu_xor()

nit: add percpu_and() here ;-)

> tj: * fixed generic percpu_sub() definition as Roel Kluin pointed out
>     * added percpu_and() for completeness's sake
>     * made generic percpu ops atomic against preemption

okay - as long as the optimized versions stay single-instruction i'm a 
happy camper.

	Ingo
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