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Subject: Re: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs
From: Peter Zijlstra <peterz@infradead.org>
To: Lin Ming <ming.m.lin@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>, Corey Ashford <cjashfor@linux.vnet.ibm.com>,
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       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>,
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Date: Tue, 11 May 2010 11:48:42 +0200
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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/