linux-kernel - Re: [PATCH RFC] cpu alloc cleanups and implementation improvement

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Message-Id: <200811221511.39434.rusty@rustcorp.com.au>
Date:	Sat, 22 Nov 2008 15:11:38 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH RFC] cpu alloc cleanups and implementation improvement

On Saturday 22 November 2008 01:19:29 Christoph Lameter wrote:
> On Fri, 21 Nov 2008, Stephen Rothwell wrote:
> > > I would not mind if you would take over from here.
> >
> > So, should I remove the cpu_alloc tree from linux-next?
>
> I think the cpu_alloc branch itself is fine because it only contains the
> allocator and a single use case.

I think the textual conflicts kill us, but yes, they're orthgonal.

> The more invasive stuff is stage2 and the following which is not in next
> yet. The way I envision to go forward is with a gradual transition to the
> new APIs converting dynamic percpu users to use the new percpu operations
> and functionality.

Yes, and this is the real payoff (though your slub tranformation is pretty 
sweet too..).

> The whole thing becomes riskier if we directly replace all allocpercpu
> users as proposed by Rusty.
>
> Rusty, are you going to take this on?

Yes, I think I have to.  It's always risky to replace an implementation, but 
IMHO the current one was always a stopgap.

Sure, the net ones are probably going to have to revert to a boutique old-
style percpu allocator until we have growing per-cpu regions.  But Dave's 
already suggested something similar.

Thanks,
Rusty.
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