Section (2) s390_runtime_instr
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_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 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 insignum
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.
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.
The asm/runtime_instr.h
header file is available since Linux 4.16.
COLOPHON
This page is part of release 5.04 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/.
Copyright (c) IBM Corp. 2012 Author: Jan Glauber <janglinux.vnet.ibm.com> %%%LICENSE_START(GPLv2+_DOC_FULL) This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU General Public License_zsingle_quotesz_s references to object code and executables are to be interpreted as the output of any document formatting or typesetting system, including intermediate and printed output. This manual is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this manual; if not, see <http://www.gnu.org/licenses/>. %%%LICENSE_END |