S390_RUNTIME_INSTR(2) System Calls Manual 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 architecture. 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 4.15 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)