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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
S390_RUNTIME_INSTR(2) System Calls Manual S390_RUNTIME_INSTR(2)
s390_runtime_instr - enable/disable s390 CPU run-time instrumentation
#include <asm/runtime_instr.h>
int s390_runtime_instr(int command, int signum);
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 one of the error codes listed
below.
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.
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.
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.
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 release 5.08 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/.
Linux Programmer's Manual 2020-06-09 S390_RUNTIME_INSTR(2)
Pages that refer to this page: syscalls(2)
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