From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: kosaki.motohiro@jp.fujitsu.com, Rik van Riel <riel@redhat.com>,
Kent Overstreet <kent.overstreet@gmail.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>
Subject: Re: KVM bug, git bisected
Date: Tue, 30 Mar 2010 09:34:15 +0900 (JST) [thread overview]
Message-ID: <20100330093114.8E93.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <1269881082.12097.359.camel@laptop>
> 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.
offtopic: We are plan to increase default maximum vmas limit from 64k
at 1 or 2 years later on 64bit. It was necessary because gdb couldn't
parse >64k vmas (i.e. mainly it's for core dump). but it was solved already.
next prev parent reply other threads:[~2010-03-30 0:34 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-27 12:43 Kent Overstreet
2010-03-29 16:11 ` Rik van Riel
2010-03-29 16:27 ` Rik van Riel
2010-03-29 16:29 ` Peter Zijlstra
2010-03-29 16:44 ` Peter Zijlstra
2010-03-30 0:34 ` KOSAKI Motohiro [this message]
2010-03-29 22:23 ` Dave Chinner
2010-04-01 18:58 ` Maciej Rutecki
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