linux-kernel - Re: [patch 04/41] cpu ops: Core piece for generic atomic per cpu operations

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Message-Id: <200805301705.43594.rusty@rustcorp.com.au>
Date:	Fri, 30 May 2008 17:05:42 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <clameter@....com>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Travis <travis@....com>
Subject: Re: [patch 04/41] cpu ops: Core piece for generic atomic per cpu operations

On Friday 30 May 2008 15:38:25 Andrew Morton wrote:
> On Thu, 29 May 2008 22:17:55 -0700 (PDT) Christoph Lameter 
<clameter@....com> wrote:
> > But then its related to percpu operations and relies extensively on the
> > various percpu.h files in asm-generic and asm-arch and include/linux
>
> Well that should be fixed.  We should never have mixed the
> alloc_percpu() and DEFINE_PER_CPU things inthe same header.  They're
> different.
>
> otoh as you propose removing the old alloc_percpu() I guess the end
> result is no worse than what we presently have.

No, the worst thing is that this is a great deal of churn which doesn't 
actually fix the "running out of per-cpu memory" problem.

It can, and should, be fixed, before changing dynamic percpu alloc to use the 
same percpu pool.

Rusty.
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