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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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s390_runtime_instr(2) System Calls Manual s390_runtime_instr(2)
s390_runtime_instr - enable/disable s390 CPU run-time
instrumentation
Standard C library (libc, -lc)
#include <asm/runtime_instr.h> /* Definition of S390_* constants */
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
int syscall(SYS_s390_runtime_instr, int command, int signum);
Note: glibc provides no wrapper for s390_runtime_instr(),
necessitating the use of syscall(2).
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.
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; thus, in current kernels, this
argument is ignored.
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
indicate the error.
EINVAL The value specified in command is not a valid command.
EINVAL The value specified in signum is not a real-time signal
number. From Linux 4.4 onwards, the signum argument has no
effect, so that an invalid signal number will not result in
an error.
ENOMEM Allocating memory for the run-time instrumentation control
block failed.
EOPNOTSUPP
The run-time instrumentation facility is not available.
Linux on s390.
Linux 3.7. System z EC12.
The asm/runtime_instr.h header file is available since Linux 4.16.
Starting with Linux 4.4, support for signalling was removed, as
was the check whether 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 signum and install a
handler for that signal.
syscall(2), signal(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 s390_runtime_instr(2)
Pages that refer to this page: syscalls(2)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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