Re: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs

[Peter Zijlstra]

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/


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