linux-kernel - Re: KVM bug, git bisected

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Message-ID: <1269881082.12097.359.camel@laptop>
Date:	Mon, 29 Mar 2010 18:44:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Kent Overstreet <kent.overstreet@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: KVM bug, git bisected

On Mon, 2010-03-29 at 18:29 +0200, Peter Zijlstra wrote:

> > Peter, would it be safe to increase PREEMPT_BITS to eg. 10?

One reason this all sucks massive is that nesting that many spinlocks
creates a terribly large !preempt section.

There is nothing that stops someone from creating 64k vmas (or more when
someone raises that sysctl) and try this, that's just utter suckage.

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