linux-kernel - Re: [PATCH 00/11] generic software counters -v2

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Message-ID: <20090313130730.GA10117@elte.hu>
Date:	Fri, 13 Mar 2009 14:07:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>
Cc:	paulus@...ba.org, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/11] generic software counters -v2


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> This patch set improves the current software counters by 
> providing sampling events for most of them.
> 
> The clock based software counters use hrtimers to generate 
> events, allowing sample based profiling without hardware 
> support -- obviously this has limited functionality for kernal 
> based profiling since we disable interrupts quite frequently, 
> but should be good for userspace.
> 
> Other events like pagefaults insert simple hooks into the 
> actual pagefault code to generate these events.

Very nice series! Applied to tip:core/locking and 
tip:perfcounters/core - thanks Peter!

Fixed a trivial !PERF_COUNTERS build failure as well.

> Future work (in-progress) will hook into the tracepoint 
> infrastructure to to provide profiling events.

Cool!

Especially for pagefaults we have a number of callbacks there: 
kmmio, kprobes, kmemcheck, tracing, perfcounters - they could 
indeed all be consolidated step by step onto a tracepoint.

	Ingo
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