linux-kernel - Re: [patch 4/4] vunmap: Fix racy use of rcu

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Message-ID: <alpine.DEB.1.10.0910061241250.18309@gentwo.org>
Date:	Tue, 6 Oct 2009 12:43:33 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	nickpiggin@...oo.com.au,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, linux-mm@...ck.org
Subject: Re: [patch 4/4] vunmap: Fix racy use of rcu_head

On Tue, 6 Oct 2009, Mathieu Desnoyers wrote:

> Simplest fix: directly kfree the data structure rather than doing it lazily.

The delay is necessary as far as I can tell for performance reasons. But
Nick was the last one fiddling around with the subsystem as far as I
remember. CCing him. May be he has a minute to think about a fix that
preserved performance.

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