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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_RUN‐
TIME_INSTR_START, 1) or stopped (S390_RUNTIME_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 instrumen‐
tation 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 3.74 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 http://www.kernel.org/doc/man-pages/.
Linux Programmer's Manual 2012-12-17 S390_RUNTIME_INSTR(2)
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