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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>
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Date: Tue, 11 May 2010 17:03:40 +0800
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On Tue, 2010-05-11 at 16:50 +0800, Peter Zijlstra wrote:
> On Tue, 2010-05-11 at 16:20 +0800, Lin Ming wrote:
> 
> > How will this sysfs interface be used for userspace tool?
> > 
> >  /sys/devices/system/node/nodeN/node_events
> >                                node_events/event_source_id
> > 
> >                                node_events/local_misses/event_id
> >                                           /local_hits/event_id
> >                                           /remote_misses/event_id
> >                                           /remote_hits/event_id
> > 
> > For example, to monitor node event local_misses on node 0, does it work
> > as below?
> > 
> > 1. perf top -e local_misses -n 0 (-n 0 means node 0)
> > 
> > 2. read /sys/devices/system/node/node0/node_events/event_source_id to
> > get the pmu_id
> > 
> > 3. read /sys/devices/system/node/node0/node_events/local_misses/event_id
> > to get the event_id
> > 
> > 4. event_attr::pmu_id=pmu_id, event::config=event_id
> > 
> > 5. other setting...
> > 
> > 6. call syscall perf_event_open(....)
> 
> No, you'll use event_source_id as perf_event_attr::type, use event_id as
> perf_event_attr::config and then use a cpu-wide counter on a cpu
> contained in node0.

Is event_source_id a link to event_source class?

For example, 2 event sources on Nehalem
/sys/class/event_sources/core_pmu
/sys/class/event_sources/uncore_pmu

Then,
/sys/devices/system/node/nodeN/node_events/event_source_id is a link
to /sys/class/event_sources/uncore_pmu.

/sys/devices/system/cpu/cpuN/cpu_hardware_events/event_source_id is a
link to /sys/class/event_sources/core_pmu.

And, the event_source_id
#cat /sys/class/event_sources/core_pmu
0

#cat /sys/class/event_sources/uncore_pmu
1