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

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Message-ID: <1263981472.4283.843.camel@laptop>
Date:	Wed, 20 Jan 2010 10:57:52 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Jim Keniston <jkenisto@...ibm.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	ananth@...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 Wed, 2010-01-20 at 11:43 +0200, Avi Kivity wrote:
> 1. Write a trace entry into shared memory, trap into the kernel on overflow.
> 2. Trap if a condition is satisfied (fast watchpoint implementation).

So now you want to consume more of a process' address space to store
trace data as well? Not to mention that that process could wreck the
trace data rendering it utterly unreliable.

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