From mboxrd@z Thu Jan  1 00:00:00 1970
From: peterz@infradead.org (Peter Zijlstra)
Date: Tue, 12 Apr 2011 12:30:28 +0200
Subject: [RFC] Extending ARM perf-events for multiple PMUs
In-Reply-To: <20110412153937.07a2311e@tom-lei>
References: <1302282912.5758.25.camel@e102144-lin.cambridge.arm.com>
	<1302349235.9086.1270.camel@twins>  <20110412153937.07a2311e@tom-lei>
Message-ID: <1302604228.2035.2.camel@laptop>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Tue, 2011-04-12 at 15:39 +0800, Ming Lei wrote:
> > I just haven't figured out a way to dynamically add files/directories
> 
> Seems not very difficult, we have pmu_bus already, so introduce the
> .match to find driver according device name, then implement a
> driver for the pmu device to add this needed attributes(files).

It probably isn't very hard, but I'm not sysfs/driver skilled and
haven't been able to put a lot of time in.

> > in the whole struct device sysfs muck (that also pleases the
> > driver/sysfs folks). Nor have we agreed on a sane layout for such
> > events there.
> 
> You mean we can find this event names here and pass them to perf -e ? 

That's the purpose yes. The intermediate problem is how to represent
these events in the sysfs hierarchy such that not every pmu
implementation does it differently.