linux-kernel - Re: [rfc] Describe events in a structured way via sysfs

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Message-ID: <1277194574.3637.13.camel@jlt3.sipsolutions.net>
Date:	Tue, 22 Jun 2010 10:16:14 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Greg KH <greg@...ah.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <carll@...ibm.com>,
	Kay Sievers <kay.sievers@...y.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [rfc] Describe events in a structured way via sysfs

On Tue, 2010-06-22 at 16:04 +0800, Lin Ming wrote:

> > Which really just means that whoever writes the tracepoint needs to
> > provide a struct device for where to put it (at least in the case of
> > driver tracepoints), and then ideally some description of the device
> > also gets put into the ringbuffer.
> 
> I'm not familiar with tracepoint code. Correct me if I'm wrong.
> Do you mean that, for example, if iwlwifi_dev_ioread32 event is traced,
> then the "device" info will get put into the ftrace ringbuffer?

No, right now it doesn't.

johannes

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