linux-kernel - Re: [thiscpuops upgrade 10/10] Lockless (and preemptless) fastpaths for slub

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Date:	Tue, 23 Nov 2010 21:13:33 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	akpm@...ux-foundation.org, Pekka Enberg <penberg@...helsinki.fi>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [thiscpuops upgrade 10/10] Lockless (and preemptless) fastpaths
 for slub

On Wed, 24 Nov 2010, Eric Dumazet wrote:

> Hmm, this only works for power of two NR_CPUS, or else one cpu 'tid'
> could wrap on another cpu tid.

Hmm... That essentially like using a bitfield then.

> I suggest using 4096  (or roundup_pow_of_two(CONFIG_NR_CPUS))

There could be machines with 64k cpus soon. So I guess roundupp2 it will
have to be.


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