linux-kernel - Re: [PATCH 1/2] perf: Add persistent events

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Date:	Thu, 3 Jun 2010 14:32:42 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Borislav Petkov <bp@...64.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Borislav Petkov <bp@...en8.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Lin Ming <ming.m.lin@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf: Add persistent events

Em Thu, Jun 03, 2010 at 03:43:01PM +0200, Borislav Petkov escreveu:
> From: Peter Zijlstra <peterz@...radead.org>
> Date: Fri, May 28, 2010 at 08:07:10PM +0200
> > to allocate and attach a buffer to your event (do so for each cpu's MCE
> > event).
> > 
> > After that we still need a way to expose all that to userspace, but at
> > least the events will be complete and able to record bits ;-)
> 
> Yep, so far so good, the kernel side is almost done - this was the
> easy part :). So recently I started looking into how the userspace
> part could be done most efficiently so that, initially, the RAS daemon
> doesn't suck in all of tools/perf when building and depend unnecessary
> on libelf etc, and, at the same time, doesn't duplicate functionality
> like util/debugfs, get_debugfs_mntpt(), parse_events() maybe later etc.
> 
> So, the best way to do this, IMHO, is if I start carving out common and
> generic functionality into tools/lib/ or tools/util/ or similar so that
> perf and ras can share those. And maybe later even other tools. This
> could be where we host all the kernel headers stuff which are good for
> userspace, i.e. those which are in tools/perf/util/include/linux/
> 
> Opinions, comments?

Right, that has to be done, I have sample code I want to put in samples/
to show how to use the symbol libraries in tools/perf/util/, will take a
stab at moving things for tools/lib/.

We'll need a top level Makefile, I guess, so that when asking to build
tools/perf, it notices that it has to build tools/lib/, etc.

Probably we'll need tools/lib/symbols/, tools/lib/trace/parser/ things
like that, I'll start with the symbols part, using a samples/ file I
already wrote.

- Arnaldo
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