netdev - Re: [PATCH] percpu: add optimized generic percpu accessors

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Message-ID: <4976B82E.1080002@kernel.org>
Date:	Wed, 21 Jan 2009 14:52:46 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	akpm@...ux-foundation.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

Ingo Molnar wrote:
> 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.

Well, the infrequent usage of dynamic percpu allocation is in some
part due to the poor implementation, so it's sort of chicken and egg
problem.  I got into this percpu thing because I wanted a percpu
reference count which can be dynamically allocated and it sucked.

Thanks.

-- 
tejun
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