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

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Message-ID: <84144f021001180451k2a84f17x3dc24796fea986c9@mail.gmail.com>
Date:	Mon, 18 Jan 2010 14:51:06 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Avi Kivity <avi@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	ananth@...ibm.com, Jim Keniston <jkenisto@...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 Mon, Jan 18, 2010 at 2:44 PM, Srikar Dronamraju
<srikar@...ux.vnet.ibm.com> wrote:
> * Avi Kivity <avi@...hat.com> [2010-01-18 14:17:10]:
>
>> On 01/18/2010 02:13 PM, Pekka Enberg wrote:
>> >So how big chunks of the address space are we talking here for uprobes?
>>
>> 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.
>
> On x86, each probe takes 16 bytes.

And how many probes do we expected to be live at the same time in
real-world scenarios? I guess Avi's "one million" is more than enough?
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