s390_runtime_instr(2)

1S390_RUNTIME_INSTR(2)         System Calls Manual        S390_RUNTIME_INSTR(2)
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NAME

6       s390_runtime_instr - enable/disable s390 CPU run-time instrumentation
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SYNOPSIS

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

14       The  s390_runtime_instr()  system  call  starts  or  stops CPU run-time
15       instrumentation for the calling thread.
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17       The command  argument  controls  whether  run-time  instrumentation  is
18       started    (S390_RUNTIME_INSTR_START,    1)   or   stopped   (S390_RUN‐
19       TIME_INSTR_STOP, 2) for the calling thread.
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21       The signum argument specifies the number of a  real-time  signal.   The
22       real-time  signal is sent to the thread if the run-time instrumentation
23       buffer is full  or  if  the  run-time-instrumentation-halted  interrupt
24       occurred.
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RETURN VALUE

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

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

44       This system call is available since Linux 3.7.
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CONFORMING TO

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

52       Glibc  does  not provide a wrapper for this system call, use syscall(2)
53       to call it.
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55       The asm/runtime_instr.h header file is available since Linux 4.16.
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COLOPHON

61       This page is part of release 5.02 of the Linux  man-pages  project.   A
62       description  of  the project, information about reporting bugs, and the
63       latest    version    of    this    page,    can     be     found     at
64       https://www.kernel.org/doc/man-pages/.
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68Linux Programmer's Manual         2019-03-06             S390_RUNTIME_INSTR(2)