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

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Message-ID: <alpine.DEB.2.00.1011232109001.7446@router.home>
Date:	Tue, 23 Nov 2010 21:09:53 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.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,
	Eric Dumazet <eric.dumazet@...il.com>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [thiscpuops upgrade 10/10] Lockless (and preemptless) fastpaths
 for slub

On Tue, 23 Nov 2010, Mathieu Desnoyers wrote:

> Ah! I knew I was missing something: the second cmpxchg will fail because it
> expects "tid", but the value is now the "next_tid". So effectively, many
> instances of the same transaction can run concurrently, but only one will
> succeed.

Right.

> Sorry for the noise.

No its good to hear that you were not able to find a hole on first glance.
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