linux-kernel - Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

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Message-ID: <20100120125546.GC1420@ucw.cz>
Date:	Wed, 20 Jan 2010 13:55:46 +0100
From:	Pavel Machek <pavel@....cz>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Avi Kivity <avi@...hat.com>, ananth@...ibm.com,
	Jim Keniston <jkenisto@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	utrace-devel <utrace-devel@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	Mark Wielaard <mjw@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

On Sun 2010-01-17 16:01:46, Peter Zijlstra wrote:
> On Sun, 2010-01-17 at 16:56 +0200, Avi Kivity wrote:
> > On 01/17/2010 04:52 PM, Peter Zijlstra wrote:
> 
> > > Also, if its fixed size you're imposing artificial limits on the number
> > > of possible probes.
> > >    
> > 
> > Obviously we'll need a limit, a uprobe will also take kernel memory, we 
> > can't allow people to exhaust it.
> 
> Only if its unprivilidged, kernel and root should be able to place as
> many probes until the machine keels over.

Well, it is address space that limits you in both cases...

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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