From: David Miller <davem@davemloft.net>
To: cl@linux-foundation.org
Cc: tj@kernel.org, rusty@rustcorp.com.au, mingo@elte.hu,
herbert@gondor.apana.org.au, akpm@linux-foundation.org,
hpa@zytor.com, brgerst@gmail.com, ebiederm@xmission.com,
travis@sgi.com, linux-kernel@vger.kernel.org, steiner@sgi.com,
hugh@veritas.com, netdev@vger.kernel.org,
mathieu.desnoyers@polymtl.ca
Subject: Re: [PATCH] percpu: add optimized generic percpu accessors
Date: Tue, 27 Jan 2009 13:47:47 -0800 (PST) [thread overview]
Message-ID: <20090127.134747.153565246.davem@davemloft.net> (raw)
In-Reply-To: <alpine.DEB.1.10.0901271506580.3114@qirst.com>
From: Christoph Lameter <cl@linux-foundation.org>
Date: Tue, 27 Jan 2009 15:08:57 -0500 (EST)
> On Tue, 27 Jan 2009, Tejun Heo wrote:
>
> > > later). That's because they use TLB tricks for a static 64k per-cpu
> > > area, but this doesn't scale. That might not be vital: abandoning
> > > that trick will mean they can't optimise read_percpu/read_percpu_var
> > > etc as much.
>
> Why wont it scale? this is a separate TLB entry for each processor.
The IA64 per-cpu TLB entry only covers 64k which makes use of it for
dynamic per-cpu stuff out of the question. That's why it "doesn't
scale"
next prev parent reply other threads:[~2009-01-27 21:47 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090115183942.GA6325@elte.hu>
[not found] ` <20090116001200.GA9137@gondor.apana.org.au>
[not found] ` <20090116001544.GA11073@elte.hu>
2009-01-16 0:18 ` [PATCH] percpu: add optimized generic percpu accessors Herbert Xu
[not found] ` <200901170827.33729.rusty@rustcorp.com.au>
2009-01-16 22:08 ` Ingo Molnar
[not found] ` <200901201328.24605.rusty@rustcorp.com.au>
2009-01-20 6:25 ` Tejun Heo
2009-01-20 10:36 ` Ingo Molnar
[not found] ` <200901271213.18605.rusty@rustcorp.com.au>
2009-01-27 2:24 ` Tejun Heo
2009-01-27 13:13 ` Ingo Molnar
2009-01-27 23:07 ` Tejun Heo
2009-01-28 3:36 ` Tejun Heo
2009-01-28 8:12 ` Tejun Heo
2009-01-27 20:08 ` Christoph Lameter
2009-01-27 21:47 ` David Miller [this message]
2009-01-27 22:47 ` Rick Jones
2009-01-28 0:17 ` Luck, Tony
2009-01-28 16:48 ` Christoph Lameter
2009-01-28 17:15 ` Luck, Tony
2009-01-28 16:45 ` Christoph Lameter
2009-01-28 20:47 ` David Miller
2009-01-28 10:38 ` Rusty Russell
2009-01-28 10:56 ` Tejun Heo
2009-01-29 2:06 ` Rusty Russell
2009-01-31 6:11 ` Tejun Heo
2009-01-28 16:50 ` Christoph Lameter
2009-01-28 18:07 ` Mathieu Desnoyers
2009-01-29 18:33 ` Christoph Lameter
2009-01-29 18:48 ` H. Peter Anvin
2009-01-20 10:40 ` Ingo Molnar
2009-01-21 5:52 ` Tejun Heo
2009-01-21 10:05 ` Ingo Molnar
2009-01-21 11:21 ` Eric W. Biederman
2009-01-21 12:45 ` Stephen Hemminger
2009-01-21 14:13 ` Eric W. Biederman
2009-01-21 20:34 ` David Miller
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