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

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Message-ID: <4B556855.6040800@redhat.com>
Date:	Tue, 19 Jan 2010 10:07:49 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Jim Keniston <jkenisto@...ibm.com>
CC:	Pekka Enberg <penberg@...helsinki.fi>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>, 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 01/19/2010 12:15 AM, Jim Keniston wrote:
>
>> I don't like the idea but if the performance benefits are real (are
>> they?),
>>      
> Based on what seems to be the closest thing to an apples-to-apples
> comparison -- counting the number of calls to a specified function --
> uprobes is 6-7 times faster than the ptrace-based equivalent, ltrace -c.
> And of course, uprobes provides much, much more flexibility, appears to
> scale better, and works with multithreaded apps.
>
> Likewise, FWIW, utrace is more than 10x faster than strace -c in
> counting system calls.
>
>    

This is still with a kernel entry, yes?  Do you have plans for a variant 
that's completely in userspace?

-- 
error compiling committee.c: too many arguments to function

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