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

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Message-ID: <1263739939.557.20938.camel@twins>
Date:	Sun, 17 Jan 2010 15:52:19 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	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 at 16:39 +0200, Avi Kivity wrote:
> On 01/15/2010 11:50 AM, Peter Zijlstra wrote:
> > As previously stated, I think poking at a process's address space is an
> > utter no-go.
> >    
> 
> Why not reserve an address space range for this, somewhere near the top 
> of memory?  It doesn't have to be populated if it isn't used.

Because I think poking at a process's address space like that is gross.
Also, if its fixed size you're imposing artificial limits on the number
of possible probes.


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