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

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Date:	Wed, 14 Jan 2009 10:45:46 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Tejun Heo <tj@...nel.org>, 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


* Ingo Molnar <mingo@...e.hu> wrote:

> Tejun, could you please also add the patch below to your lineup too?
> 
> 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()
> 
> and implements support for them on x86. (other architectures will fall 
> back to a default implementation)

btw., this patch means that we can move Brian's original PDA cleanups 
fully and without kernel size bloat: instead of pda_read() we can use 
percpu_read(), and not bloat the kernel at all.

and thus the pda ops can go away completely.

	Ingo
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