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Subject: Re: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs
From: Lin Ming <ming.m.lin@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, Corey Ashford <cjashfor@linux.vnet.ibm.com>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       "eranian@gmail.com" <eranian@gmail.com>,
       "Gary.Mohr@Bull.com" <Gary.Mohr@bull.com>,
       "arjan@linux.intel.com" <arjan@linux.intel.com>,
       "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
       Paul Mackerras <paulus@samba.org>,
       "David S. Miller" <davem@davemloft.net>,
       Russell King <rmk+kernel@arm.linux.org.uk>,
       Paul Mundt <lethal@linux-sh.org>, lkml <linux-kernel@vger.kernel.org>,
       Arnaldo Carvalho de Melo <acme@redhat.com>,
       Will Deacon <will.deacon@arm.com>, Maynard Johnson <mpjohn@us.ibm.com>,
       Carl Love <carll@us.ibm.com>, "greg@kroah.com" <greg@kroah.com>,
       Kay Sievers <kay.sievers@vrfy.org>
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Date: Tue, 11 May 2010 17:53:02 +0800
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On Tue, 2010-05-11 at 17:48 +0800, Peter Zijlstra wrote:
> On Tue, 2010-05-11 at 17:40 +0800, Lin Ming wrote:
> > /sys/devices/system/cpu/cpu0/cpu_hw_events/*
> > /sys/devices/system/cpu/cpu0/cpu_hw_cache_events/*
> > /sys/devices/system/cpu/cpu0/cpu_raw_events/*
> > ....
> > ....
> > /sys/devices/system/cpu/cpuN/cpu_hw_events/*
> > /sys/devices/system/cpu/cpuN/cpu_hw_cache_events/*
> > /sys/devices/system/cpu/cpuN/cpu_raw_events/*
> > 
> > Is /sys/class/event_sources/* looks like,
> > 
> > /sys/class/event_sources/cpu_hw_events0
> > -> /sys/devices/system/cpu/cpu0/cpu_hw_events
> > ...
> > /sys/class/event_sources/cpu_hw_eventsN
> > -> /sys/devices/system/cpu/cpuN/cpu_hw_events
> > 
> > /sys/class/event_sources/cpu_hw_cache_events0
> > -> /sys/devices/system/cpu/cpu0/cpu_hw_events
> > ...
> > /sys/class/event_sources/cpu_hw_cache_eventsN
> > -> /sys/devices/system/cpu/cpuN/cpu_hw_events
> 
> Hmm, good question.
> 
> No all the cpus would have the same event sources. I'm not sure if we
> can make sysfs understand that though (added GregKH and Kay to CC).
> 
> Possibly we'd have to place them at the cpu level, like:
> 
>  /sys/devices/system/cpu/cpu_*_events/
> 
> and have links like:
> 
>  /sys/devices/system/cpu/cpuN/cpu_*_events ->
>     /sys/devices/system/cpu/cpu_*_events/
> 
> as well as
> 
>  /sys/class/event_sources/cpu_*_events ->
>     /sys/devices/system/cpu/cpu_*_events/

Ah, I like this idea.

Thanks.