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

[Lin Ming]

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.

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