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

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Date:	Tue, 20 Jan 2009 11:40:22 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	akpm@...ux-foundation.org, tj@...nel.org, hpa@...or.com,
	brgerst@...il.com, ebiederm@...ssion.com, cl@...ux-foundation.org,
	travis@....com, linux-kernel@...r.kernel.org, steiner@....com,
	hugh@...itas.com, "David S. Miller" <davem@...emloft.net>,
	netdev@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [PATCH] percpu: add optimized generic percpu accessors


* Rusty Russell <rusty@...tcorp.com.au> wrote:

> On Saturday 17 January 2009 08:38:32 Ingo Molnar wrote:
> > How do difficulties of dynamic percpu-alloc make my above suggestion 
> > unsuitable for SNMP stats in networking? Most of those stats are not 
> > dynamically allocated - they are plain straightforward percpu variables.
> 
> No they're not. [...]

hm, i see this got changed recently - part of the networking stats went 
over to the lib/percpu_counter API recently.

The larger point still remains: the kernel dominantly uses static percpu 
variables by a margin of 10 to 1, so we cannot just brush away the static 
percpu variables and must concentrate on optimizing that side with 
priority. It's nice if the dynamic percpu-alloc side improves as well, of 
course.

	Ingo
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