perfevent.conf(5) — Linux manual page


PERFEVENT.CONF(5)            File Formats Manual           PERFEVENT.CONF(5)

NAME         top

       perfevent.conf  -  the Performance Co-Pilot perfevent PMDA configura‐
       tion file

SYNOPSIS         top


DESCRIPTION         top

       The perfevent.conf configuration file defines which hardware
       performance counters are enabled by the perfevent PMDA.

       The configuration file contains a list of events that should be
       enabled for each PMU. The perfevent PMDA detects which PMUs present
       and programs the configured events. If multiple PMUs are available,
       the perfevent PMDA uses the order of the entries in the configuration
       file to determine which PMU settings to use. The entries at the top
       of the configuration file have higher precedence.  Only one PMU
       configuration setting is used. The configuration file may also
       contain perf derived events. A derived event has a list of events
       which must be listed as base events. The values for the counters in
       the derived events are aggregated and displayed.

FILE FORMAT         top

       The file consists of one or more groups of PMUs and the events that
       go with them.

       The PMU identification string is enclosed in brackets and one or more
       events are listed below, one per line.

              ["PMU identification string"]
              EVENT_NAME [CPU OPTION]

       For derived events, one or more groups of events can be specified
       where, counters in one group can be specific to one architecture and
       the counters in other group can be specific to some other
       architecture. Else, only one group can be specified. EVENT_NAME_1,
       EVENT_NAME_2 etc. belong to group 1 and EVENT_NAME_3, EVENT_NAME_4
       belong to group 2 and so on. If any of the event in the first group
       is not available, entire group will be discarded. And, the next group
       will be checked. The first group with all the events available will
       be activated and monitored. The derived perf event is enclosed in
       brackets along with :derived as a suffix. Note that the EVENT_NAME
       listed under derived event must be present as a base event in the
       configuration file. And, all the events under a particular derived
       perf event group must have the same CPU_OPTION. || acts as a
       separator for different groups inside a single derived event. The
       syntax is :

              EVENT_NAME_1 [CPU_OPTION] [scale]
              EVENT_NAME_2 [CPU_OPTION] [scale]
              EVENT_NAME_3 [CPU_OPTION] [scale]
              EVENT_NAME_4 [CPU_OPTION] [scale]

              The available event cpu options are as follows:

              cpu    to add the counter to all cpus in the system

              cpu_rr to add to one of the cpus in a round-robin allocation

              node   to add the counter to the first cpu in each numa node

                     to add the counter to the cpus in each numa node in a
                     round-robin allocation strategy

              [N]    where N is the numerical digit of the CPU index

              if the CPU option is absent then the event is programmed on
              all cpus.

              scale is applicable for the counters in derived events. If
              scale is given, the counters will be scaled to their
              respective values. The options are as follows :

              a float value
                     Can be a simple float value, or a value in scientific

                     The scale will be taken from the kernel sysfs scale
                     file entry for that event. Its generally specified in

              If no scale is given, the default scale will be taken as 1.0.

              Blank lines are ignored. Lines that begin with the # sign are

              Multiple, comma separated, PMUs may be specified in the PMU

SEE ALSO         top


COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at ⟨⟩.
       If you have a bug report for this manual page, send it to  This page was obtained from the project's upstream
       Git repository ⟨⟩ on
       2020-08-13.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-08-11.)  If you discover any
       rendering problems in this HTML version of the page, or you believe
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       (which is not part of the original manual page), send a mail to

Performance Co-Pilot                 PCP                   PERFEVENT.CONF(5)

Pages that refer to this page: pmdaperfevent(1)