Section (2) s390_runtime_instr
s390_runtime_instr — enable/disable s390 CPU run-time instrumentation
system call starts or stops CPU run-time instrumentation for
the calling thread.
argument controls whether run-time instrumentation is started
or stopped (
S390_RUNTIME_INSTR_STOP, 2) for the calling
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.
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
errno is set to one of the
error codes listed below.
The value specified in
commandis not a valid command or the value specified in
signumis not a real-time signal number.
Allocating memory for the run-time instrumentation control block failed.
The run-time instrumentation facility is not available.
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.
header file is available since Linux 4.16.
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Author: Jan Glauber <janglinux.vnet.ibm.com>
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