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

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Date:	Tue, 22 Jun 2010 09:52:25 +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 15:47 +0800, Lin Ming wrote:

> So it can only trace the whole hardware piece rather than a specific
> interface?
> 
> If yes, then will change to
> - /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlan0/events/iwlwifi_dev_ioread32/
> + /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/events/iwlwifi_dev_ioread32/

Yes, I guess you were right from the start and I was just thinking about
it the wrong way. So presumably you'll somehow have to "instantiate"
tracepoints for a given device?

johannes

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