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

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Message-ID: <84144f021001180424h54ce7970ra7dda2ff8a3be277@mail.gmail.com>
Date:	Mon, 18 Jan 2010 14:24:19 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Avi Kivity <avi@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, 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 01/18/2010 02:13 PM, Pekka Enberg wrote:
>> So how big chunks of the address space are we talking here for uprobes?

On Mon, Jan 18, 2010 at 2:17 PM, Avi Kivity <avi@...hat.com> wrote:
> That's for the authors to answer, but at a guess, 32 bytes per probe
> (largest x86 instruction is 15 bytes), so 32 MB will give you a million
> probes.  That's a piece of cake for x86-64, probably harder to justify for
> i386.

Yup, it's 32-bit that I worry about.
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