Hi,
I am trying to setup load latency sampling on a Sandy Bridge processor
(Cpu familly 6, model 42, model name Intel(R) Core(TM) i5-2520M CPU @
2.50GHz) running a 3.13 linux kernel.
After deep investigations made of reading of the Intel SDM, examples
provided by the pfm library and the source code of perf, I am still not
able to get sample. I think for now that my problem is related to the
precise_ip parameter of the perf_event_attr structure.
Any time I change this value from 0 to 1 or from 0 to 2 (2 is the value
to enable PEBS isn't it ?) the perf_event_open system call failed with a
"Not supported operation" error. Running perf mem record on this Sandy
Bridge platform also result in the same error.
So my question is, which way should I follow to identify why I am not
able to do load latency sampling on this hardware ?
Thanks for any advice,
----
Manu
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