NAME

       perfalloc - notify pmdaperfevent(1) to disable hardware counter allocation.

SYNOPSIS

       $PCP_PMDAS_DIR/perfevent/perfalloc [-D] [-d] [-f lockfile] [-h] [-v] [COMMAND]

DESCRIPTION

       perfalloc  is  a  command  that  notifies the pmdaperfevent(1) to disable hardware counter
       event collection. This allow unpriviledged 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.

       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

BUGS

       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.

SEE ALSO

       pmdaperfevent(1), and perfevent.conf(3),