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Diffstat (limited to 'tools/perf/Documentation/perf-stat.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-stat.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 2b38e222016a..f15b306be183 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -49,6 +49,13 @@ report:: parameters are defined by corresponding entries in /sys/bus/event_source/devices/<pmu>/format/* + Note that the last two syntaxes support prefix and glob matching in + the PMU name to simplify creation of events accross multiple instances + of the same type of PMU in large systems (e.g. memory controller PMUs). + Multiple PMU instances are typical for uncore PMUs, so the prefix + 'uncore_' is also ignored when performing this match. + + -i:: --no-inherit:: child tasks do not inherit counters @@ -260,6 +267,16 @@ taskset. --no-merge:: Do not merge results from same PMUs. +When multiple events are created from a single event specification, +stat will, by default, aggregate the event counts and show the result +in a single row. This option disables that behavior and shows +the individual events and counts. + +Multiple events are created from a single event specification when: +1. Prefix or glob matching is used for the PMU name. +2. Aliases, which are listed immediately after the Kernel PMU events + by perf list, are used. + --smi-cost:: Measure SMI cost if msr/aperf/ and msr/smi/ events are supported. |