Subject: Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)
From: Peter Zijlstra <peterz@infradead.org>
To: Avi Kivity <avi@redhat.com>
Cc: ananth@in.ibm.com, Jim Keniston <jkenisto@us.ibm.com>,
       Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
       Ingo Molnar <mingo@elte.hu>,
       Arnaldo Carvalho de Melo <acme@infradead.org>,
       utrace-devel <utrace-devel@redhat.com>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       Masami Hiramatsu <mhiramat@redhat.com>,
       Maneesh Soni <maneesh@in.ibm.com>, Mark Wielaard <mjw@redhat.com>,
       LKML <linux-kernel@vger.kernel.org>
In-Reply-To: <4B53213C.9050303@redhat.com>
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Date: Sun, 17 Jan 2010 15:52:19 +0100
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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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