admin-guide/perf/xgene-pmu.rst

2 APM X-Gene SoC Performance Monitoring Unit (PMU)
5 X-Gene SoC PMU consists of various independent system device PMUs such as
12 -----------------
14 The xgene-pmu driver registers several perf PMU drivers. Each of the perf
18 The "format" directory describes format of the config (event ID),
20 directory provides configuration templates for all supported event types that
21 can be used with perf tool. For example, "l3c0/bank-fifo-full/" is an
24 Most of the SoC PMU has a specific list of agent ID used for monitoring
25 performance of a specific datapath. For example, agents of a L3 cache can be
26 a specific CPU or an I/O bridge. Each PMU has a set of 2 registers capable of
28 the bit number corresponding to the agent is set, the event is counted only if
30 to a corresponding bit in "config1" field. By default, the event will be
32 each PMU, please refer to APM X-Gene User Manual.
39  / # perf list | grep -e l3c -e iob -e mcb -e mc
40    l3c0/ackq-full/                                    [Kernel PMU event]
42    mcb1/mcb-csw-stall/                                [Kernel PMU event]
44  / # perf stat -a -e l3c0/read-miss/,mcb1/csw-write-request/ sleep 1
46  / # perf stat -a -e l3c0/read-miss,config1=0xfffffffffffffffe/ sleep 1
49 not work. Per-task (without "-a") perf sessions are not supported.