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.
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/.
