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man:s390_runtime_instr

S390_RUNTIME_INSTR(2) S390_RUNTIME_INSTR(2)

NAME

     s390_runtime_instr - enable/disable s390 CPU run-time instrumentation

SYNOPSIS

     #include <asm/runtime_instr.h>
     int s390_runtime_instr(int command, int signum);

DESCRIPTION

     The  s390_runtime_instr()  system  call  starts  or  stops CPU run-time
     instrumentation for the calling thread.
     The command  argument  controls  whether  run-time  instrumentation  is
     started    (S390_RUNTIME_INSTR_START,    1)   or   stopped   (S390_RUN-
     TIME_INSTR_STOP, 2) for the calling thread.
     The signum argument specifies the number of a  real-time  signal.   The
     real-time  signal is sent to the thread if the run-time instrumentation
     buffer is full  or  if  the  run-time-instrumentation-halted  interrupt
     occurred.

RETURN VALUE

     On  success,  s390_runtime_instr() returns 0 and enables the thread for
     run-time instrumentation by assigning the  thread  a  default  run-time
     instrumentation control block.  The caller can then read and modify the
     control block and start the run-time instrumentation.  On error, -1  is
     returned and errno is set to one of the error codes listed below.

ERRORS

     EINVAL The  value  specified  in  command is not a valid command or the
            value specified in signum is not a real-time signal number.
     ENOMEM Allocating memory for the run-time instrumentation control block
            failed.
     EOPNOTSUPP
            The run-time instrumentation facility is not available.

VERSIONS

     This system call is available since Linux 3.7.

CONFORMING TO

     This Linux-specific system call is available only on the s390 architec-
     ture.  The run-time instrumentation  facility  is  available  beginning
     with System z EC12.

NOTES

     Glibc  does  not provide a wrapper for this system call, use syscall(2)
     to call it.

SEE ALSO

     syscall(2), signal(7)

COLOPHON

     This page is part of release 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.

Linux Programmer's Manual 2017-09-15 S390_RUNTIME_INSTR(2)

/data/webs/external/dokuwiki/data/pages/man/s390_runtime_instr.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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