s390_runtime_instr - enable/disable s390 CPU run-time instrumentation
int s390_runtime_instr(int command, int signum);
() system call starts or stops CPU run-time
instrumentation for the calling thread.
argument controls whether run-time instrumentation is started
, 1) or stopped
, 2) for the calling thread.
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.
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
is set to one of the error codes listed below.
- The value specified in command is not a valid
command or the value specified in signum is not a real-time signal
- Allocating memory for the run-time instrumentation control
- The run-time instrumentation facility is not
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
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