linux-kernel - Re: [patch 00/41] cpu alloc / cpu ops v3: Optimize per cpu access

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Message-ID: <Pine.LNX.4.64.0805301111570.14564@schroedinger.engr.sgi.com>
Date:	Fri, 30 May 2008 11:12:12 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Matthew Wilcox <matthew@....cx>
cc:	Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 00/41] cpu alloc / cpu ops v3: Optimize per cpu access

On Fri, 30 May 2008, Matthew Wilcox wrote:

> On Fri, May 30, 2008 at 10:50:04AM -0700, Christoph Lameter wrote:
> > cpu alloc v2 had an extendable per cpu space. You have the patches. We 
> > could put this on top of this patchset if necessary. But then it not so 
> > nice and simple anymore. Maybe we can rstrict the use of cpu alloc 
> > instead to users with objects < cache_line_size() or so?
> 
> Restricting the use of cpu_alloc based on size of object is no good when
> you're trying to allocate 45,000 objects.  Extending the per CPU space
> is the only option.

Ok guess we need to bring the virtually mapped per cpu patches forward.

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