From: Julien Desfossez <jdesfossez@efficios.com>
Date: Tue, 5 Jul 2016 15:50:46 +0000 (-0400)
Subject: Enable perf PMU counters by raw ID
X-Git-Tag: v2.9.0-rc1~84
X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=4fe444dafd2243de56091ab5dd7efa0050b0597f;hp=4fe444dafd2243de56091ab5dd7efa0050b0597f

Enable perf PMU counters by raw ID

Allow enabling perf PMU counters by raw ID in addition to the generic
list already provided. The format for kernel tracing is
"perf:cpu:raw:rNNN:<name>" and "perf:thread:raw:rNNN:<name> for
user-space. The rNNN format is the same as perf-record(1) where NNN is a
hexadecimal event descriptor in the form of umask+eventsel. The <name>
field to associate a clearer name to the counter.

Example usage on Intel i7-3520M to get the unhalted reference cycles
(eventsel: 0x13c) count at privilege level 0 (umask: 0x00):
lttng add-context -k -t perf:cpu:raw:r0013c:x86unhalted

Result in the trace:
sched_switch: { cpu_id = 3 }, {
	perf_cpu_raw_r0013c_x86unhalted = 27632578 }, [...]

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
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