What: /sys/bus/event_source/devices/<pmu>
Date: 2014/02/24
Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
Description: Performance Monitoring Unit (<pmu>)
Each <pmu> directory, for a PMU device, is a name
optionally followed by an underscore and then either a
decimal or hexadecimal number. For example, cpu is a
PMU name without a suffix as is intel_bts,
uncore_imc_0 is a PMU name with a 0 numeric suffix,
ddr_pmu_87e1b0000000 is a PMU name with a hex
suffix. The hex suffix must be more than two
characters long to avoid ambiguity with PMUs like the
S390 cpum_cf.
Tools can treat PMUs with the same name that differ by
suffix as instances of the same PMU for the sake of,
for example, opening an event. For example, the PMUs
uncore_imc_free_running_0 and
uncore_imc_free_running_1 have an event data_read;
opening the data_read event on a PMU specified as
uncore_imc_free_running should be treated as opening
the data_read event on PMU uncore_imc_free_running_0
and PMU uncore_imc_free_running_1.
