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

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Message-Id: <1277191359.5025.4.camel@minggr.sh.intel.com>
Date:	Tue, 22 Jun 2010 15:22:39 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Johannes Berg <johannes@...solutions.net>
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 14:59 +0800, Johannes Berg wrote:
> On Tue, 2010-06-22 at 14:25 +0800, Lin Ming wrote:
> > On Mon, 2010-06-21 at 17:34 +0800, Johannes Berg wrote:
> > > On Mon, 2010-06-21 at 16:55 +0800, Lin Ming wrote:
> > > 
> > > > 21. iwlwifi_io events
> > > > /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/net/wlan0/events/iwlwifi_dev_ucode_event/
> > > 
> > > 
> > > That doesn't work, you could have multiple PCI devices in your system.
> > 
> > Understood. This is just a "demo".
> > 
> > Actually, I mean
> > 
> > net/wlan0/events/
> > net/waln1/events/
> > ....
> > net/walnN/events/
> 
> That's not appropriate either though since you may have multiple network
> interfaces on the same hardware :)

Doesn't net/wlan0...wlanN mean multiple network interfaces on the same
hardware?

If my understanding is wrong, would you show me an example in sysfs?

> 
> > > > 23. skb events
> > > > /sys/class/net/events/kfree_skb/
> > > > /sys/class/net/events/skb_copy_datagram_iovec/
> > > 
> > > > 25. mac80211 events
> > > > /sys/class/net/events/drv_start/
> > > > ...
> > > > /sys/class/net/events/stop_queue
> > > 
> > > It doesn't really seem right to mix all these.
> > 
> > Well, agree, skb events are totally different with mac80211 events.
> > Any idea?
> 
> I suppose the most appropriate thing would
> be /sys/class/ieee80211/phyN/events/... for almost all of them.

Good idea.

Thanks,
Lin Ming

> 
> johannes
> 

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