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-.\" Copyright (c) IBM Corp. 2012
-.\" Author: Jan Glauber <jang@linux.vnet.ibm.com>
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH s390_runtime_instr 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-s390_runtime_instr \- enable/disable s390 CPU run-time instrumentation
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#include <asm/runtime_instr.h>" " /* Definition of " S390_* " constants */"
-.BR "#include <sys/syscall.h>" "       /* Definition of " SYS_* " constants */"
-.B #include <unistd.h>
-.P
-.BI "int syscall(SYS_s390_runtime_instr, int " command ", int " signum );
-.fi
-.P
-.IR Note :
-glibc provides no wrapper for
-.BR s390_runtime_instr (),
-necessitating the use of
-.BR syscall (2).
-.SH DESCRIPTION
-The
-.BR s390_runtime_instr ()
-system call starts or stops CPU run-time instrumentation for the
-calling thread.
-.P
-The
-.I command
-argument controls whether run-time instrumentation is started
-.RB ( S390_RUNTIME_INSTR_START ,
-1) or stopped
-.RB ( S390_RUNTIME_INSTR_STOP ,
-2) for the calling thread.
-.P
-The
-.I signum
-argument specifies the number of a real-time signal.
-This argument was used to specify a signal number that should be delivered
-to the thread if the run-time instrumentation buffer was full or if
-the run-time-instrumentation-halted interrupt had occurred.
-This feature was never used,
-and in Linux 4.4 support for this feature was removed;
-.\" commit b38feccd663b55ab07116208b68e1ffc7c3c7e78
-thus, in current kernels, this argument is ignored.
-.SH RETURN VALUE
-On success,
-.BR 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
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-The value specified in
-.I command
-is not a valid command.
-.TP
-.B EINVAL
-The value specified in
-.I signum
-is not a real-time signal number.
-From Linux 4.4 onwards, the
-.I signum
-argument has no effect,
-so that an invalid signal number will not result in an error.
-.TP
-.B ENOMEM
-Allocating memory for the run-time instrumentation control block failed.
-.TP
-.B EOPNOTSUPP
-The run-time instrumentation facility is not available.
-.SH STANDARDS
-Linux on s390.
-.SH HISTORY
-Linux 3.7.
-System z EC12.
-.SH NOTES
-The
-.I asm/runtime_instr.h
-header file is available
-.\" commit df2f815a7df7edb5335a3bdeee6a8f9f6f9c35c4
-since Linux 4.16.
-.P
-Starting with Linux 4.4,
-support for signalling was removed, as was the check whether
-.I signum
-is a valid real-time signal.
-For backwards compatibility with older kernels, it is recommended to pass
-a valid real-time signal number in
-.I signum
-and install a handler for that signal.
-.SH SEE ALSO
-.BR syscall (2),
-.BR signal (7)