linux-kernel - Re: [patch] Performance Counters for Linux, v4

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Message-ID: <20081216122229.GA1430@ucw.cz>
Date:	Tue, 16 Dec 2008 13:22:29 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephane Eranian <eranian@...glemail.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Robert Richter <robert.richter@....com>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Anvin <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	perfctr-devel@...ts.sourceforge.net
Subject: Re: [patch] Performance Counters for Linux, v4

On Sun 2008-12-14 22:28:29, Ingo Molnar wrote:
> We are pleased to announce the v4 release of our performance counters 
> subsystem implementation. The kernel changes can be picked up from:
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git perfcounters/core
> 
>   (also in the master branch. There's also a kernel patch attached 
>    below.)
> 
> The biggest new feature in this release is the implementation of 
> "performance counter inheritance" for the per task counters: the ability 
> to extend performance counters to cover the execution of child tasks 
> too, transparently and automatically - following them to other CPUs.
> 
> This can be used to monitor a hierarchy of tasks without stopping them 
> (or impacting them in any observable way), and extending that monitoring 
> to all child tasks as well.
> 
> We've written a new utility: 'timec', which takes advantage of this new 
> kernel capability:
> 
>      http://redhat.com/~mingo/perfcounters/timec.c
> 
> 'timec' works like /usr/bin/time, but it extends the dimension of "time" 
> with all the metrics that hardware and software performance counters are 
> able to capture.

Hmm, if I timec some setuid program, what happens?

Performance counters seem like great tool to pull secret keys out of
other processes :-).
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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