Intel PEBS Load Latency Measurement

[Manuel Selva <selva.manuel@gmail.com>]

Hi all,

I am trying to use PMU on a 2 sockets workstation (2x Intel Xeon X5650 
currently running Linux 3.6.11) processor to identify memory controller 
unbalance.

For this purpose I successfully used some uncore events to count the 
load on each memory controller through the perf_event_open system call. 
I am now planning to use Intel PEBS Load Latency Measurement to identify 
if these loads result in "unusual" long memory latencies.

Looking at Vince Weaver web page discussing about kernel support for PMU 
here: 
http://web.eece.maine.edu/~vweaver/projects/perf_events/features.html I 
saw that the kernel 3.10 supports Load Latency Measurement. 
Unfortunately I can't find a man page describing how this works. Before 
looking at kernel sources, I wanted to ask here for confirmation about 
Load Latency Measurement in recent Linux kernels.

Can anyone confirm that this functionality is available and usable ? Is 
the perf userland tool using it to provide the functionality to end users ?

Thanks in advance for your help,

-- 
Manu