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

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Message-ID: <alpine.DEB.2.00.1011241013240.14268@router.home>
Date:	Wed, 24 Nov 2010 10:14:58 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	akpm@...ux-foundation.org, Pekka Enberg <penberg@...helsinki.fi>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	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, Peter Zijlstra wrote:

> This thing still relies on disabling IRQs in the slow path, which means
> its still going to be a lot of work to make it work on -rt.

The disabling of irqs is because slab operations are used from interrupt
context. If we can avoid slab operations from interrupt contexts then we
can drop the interrupt disable in the slab allocators.

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