S390_RUNTIME_INSTR
Section: System Calls (2)
Updated: 2017-09-15
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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 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 4.13 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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