linux-kernel - Re: [PATCH] modules: Use a better scheme for refcounting

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Message-Id: <200805171533.46295.rusty@rustcorp.com.au>
Date:	Sat, 17 May 2008 15:33:46 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Mike Travis <travis@....com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH] modules: Use a better scheme for refcounting

On Friday 16 May 2008 23:41:16 Mike Travis wrote:
> Eric Dumazet wrote:
> > Rusty Russell a Ã©crit :
> >>    Any chance I can ask you look at the issue of full dynamic per-cpu
> >> allocation?
> >
> > You mean using alloc_percpu() ? Problem is that current implementation
> > is expensive,

I mean rewriting alloc_percpu :)

> > We probably can change this to dynamic per-cpu as soon as Mike or
> > Christopher finish their work on new dynamic per-cpu implementation ?
>
> Yes, the zero-based percpu variables followed by the cpu_alloc patch should
> provide this and shrink the code quite well, including in some cases
> removing locking requirements (because the resultant instructions will be
> atomic.)

Ah, I hadn't realized that Mike was already working on this.  Mike, have you 
published patches already?

Thanks,
Rusty.
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