perf_event on the Raspberry Pi
If you are running kernels provided by the Raspberry-Pi
Foundation (like those found with Raspian which are
labeled for bcm2708/bcm2709) then performance
counter support was added in the 3.18.8 kernel
1f58c41a5aba262958c2869263e6fdcaa0aa3c00) (for all
versions, including Raspberry Pi 2).
If you are running upstream Linux (bcm2835/bcm2836) support
for most Raspberry Pi machines was added in the 3.16 kernel
as described below. Upstream support for the Raspberry Pi2
has not been tested.
The following document describes the process of getting
perf_event working on the Raspberry Pi.
The relevant patches should be included in the upstream kernel
by the 3.16 release.
This work was done as part of an ECE599 independent study class
at the University of Maine.
Raspberry Pi perf_event support: paradis_ece599.pdf
I might put the relevant patches here too at some point.
Previously I developed a kernel module to read out the counter values
directly, without using perf. You can find that code here:
raw kernel counter reading driver.
Back to the unofficial perf_event pages