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   s390_runtime_instr    ( 2 )

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)