pfm_self_start3

Usage

#include <perfmon/pfmlib.h>

int pfm_self_start(int fd);
int pfm_self_stop(int fd);

Overview

These two functions can only be used by self-monitoring processes. They have no effect on system wide sessions.

The pfm_self_start function activates monitoring. This function is equivalent to calling perfmonctl() with the PFM_START command and may end up calling it. On Linux/ia64 it is implemented as a lightweight call to set the psr.up bit.

The pfm_self_stop function deactivates monitoring This function is equivalent to calling perfmonctl() with the PFM_STOP command and may end up calling it.On Linux/ia64 it is implemented as a lightweight call to clear the psr.up bit.

Return

The function returns 0 if successful, otherwise -1 and the error code is set in errno.

Errors

0 is always returned on Linux/ia64.