1What: /sys/bus/event_source/devices/<pmu> 2Date: 2014/02/24 3Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> 4Description: Performance Monitoring Unit (<pmu>) 5 6 Each <pmu> directory, for a PMU device, is a name 7 optionally followed by an underscore and then either a 8 decimal or hexadecimal number. For example, cpu is a 9 PMU name without a suffix as is intel_bts, 10 uncore_imc_0 is a PMU name with a 0 numeric suffix, 11 ddr_pmu_87e1b0000000 is a PMU name with a hex 12 suffix. The hex suffix must be more than two 13 characters long to avoid ambiguity with PMUs like the 14 S390 cpum_cf. 15 16 Tools can treat PMUs with the same name that differ by 17 suffix as instances of the same PMU for the sake of, 18 for example, opening an event. For example, the PMUs 19 uncore_imc_free_running_0 and 20 uncore_imc_free_running_1 have an event data_read; 21 opening the data_read event on a PMU specified as 22 uncore_imc_free_running should be treated as opening 23 the data_read event on PMU uncore_imc_free_running_0 24 and PMU uncore_imc_free_running_1. 25