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PERFALLOC(1) General Commands Manual PERFALLOC(1)
perfalloc - notify pmdaperfevent(1) to disable hardware counter
allocation.
$PCP_PMDAS_DIR/perfevent/perfalloc [-D] [-d] [-f lockfile] [-h]
[-v] [COMMAND]
perfalloc is a command that notifies the pmdaperfevent(1) to
disable hardware counter event collection. This allow
unprivileged processes to use the hardware counters.
If the reservation request fails, then perfalloc exits
immediately with exit code EXIT_FAILURE. If successful, the
perfalloc will run until a kill signal is received. The
reservation request persists while perfalloc is running.
Note that pmdaperfevent is affected by the value of the
kernel.perf_event_paranoid setting, which can be adjusted by
sysctl(8).
If a commandline is given, this is executed as a subprocess of
the agent. When the command dies, so does the agent.
A brief description of the command line options follows:
-D run in the foreground (the default)
-d run in the background
-f FILE
use FILE as the lock file (default
$PCP_PMDAS_DIR/perfevent/perflock)
-h display a help message and exit
-v output version number and exit
There may be a delay of up to 100 miliseconds between perfalloc
requesting the hardware counter disabling and the perfevent PMDA
processing the request.
The perfalloc process does not check the status of the request
and therefore is not able to provide a positive confirmation that
the request succeeded and the hardware counters are disabled.
pmdaperfevent(1), perfevent.conf(3) and sysctl(8).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2022-12-17.
(At that time, the date of the most recent commit that was found
in the repository was 2022-12-16.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Performance Co-Pilot PCP PERFALLOC(1)
Pages that refer to this page: pmdaperfevent(1)
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