включить / отключить инструментарий времени выполнения процессора s390 (enable/disable s390 CPU run-time instrumentation)
Имя (Name)
s390_runtime_instr - enable/disable s390 CPU run-time
instrumentation
Синопсис (Synopsis)
#include <asm/runtime_instr.h> /* Definition of S390_* constants */
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
int syscall(SYS_s390_runtime_instr, int command, int signum);
Note: glibc provides no wrapper for s390_runtime_instr(),
necessitating the use of syscall(2).
Описание (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.
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.
Возвращаемое значение (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
indicate the error.
Ошибки (Error)
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.
Версии (Versions)
This system call is available since Linux 3.7.
Стандарты (Conforming to)
This Linux-specific system call is available only on the s390
architecture. The run-time instrumentation facility is available
beginning with System z EC12.
Примечание (Note)
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.
Смотри также (See also)
syscall(2), signal(7)
