|S390_RUNTIME_INSTR(2)||System Calls Manual||S390_RUNTIME_INSTR(2)|
int s390_runtime_instr(int command, int signum);
Note: There is no glibc wrapper for this system call; see NOTES.
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.
- The value specified in command is not a valid command.
- 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.
- Allocating memory for the run-time instrumentation control block failed.
- The run-time instrumentation facility is not available.
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.
|2021-03-22||Linux Programmer's Manual|