Function sysctl_kern_prof

freebsd/kern/subr_prof.c:325–387

* Return kernel profiling information. */

 * Return kernel profiling information.
 */
static int
sysctl_kern_prof(SYSCTL_HANDLER_ARGS)
{
	int *name = (int *) arg1;
	u_int namelen = arg2;
	struct gmonparam *gp = &_gmonparam;
	int error;
	int state;

	/* all sysctl names at this level are terminal */
	if (namelen != 1)
		return (ENOTDIR);		/* overloaded */

	switch (name[0]) {
	case GPROF_STATE:
		state = gp->state;
		error = sysctl_handle_int(oidp, &state, 0, req);
		if (error)
			return (error);
		if (!req->newptr)
			return (0);
		if (state == GMON_PROF_OFF) {
			gp->state = state;
			PROC_LOCK(&proc0);
			stopprofclock(&proc0);
			PROC_UNLOCK(&proc0);
			stopguprof(gp);
		} else if (state == GMON_PROF_ON) {
			gp->state = GMON_PROF_OFF;
			stopguprof(gp);
			gp->profrate = profhz;
			PROC_LOCK(&proc0);
			startprofclock(&proc0);
			PROC_UNLOCK(&proc0);
			gp->state = state;
#ifdef GUPROF
		} else if (state == GMON_PROF_HIRES) {
			gp->state = GMON_PROF_OFF;
			PROC_LOCK(&proc0);
			stopprofclock(&proc0);
			PROC_UNLOCK(&proc0);
			startguprof(gp);
			gp->state = state;
#endif
		} else if (state != gp->state)
			return (EINVAL);
		return (0);
	case GPROF_COUNT:
		return (sysctl_handle_opaque(oidp, 
			gp->kcount, gp->kcountsize, req));
	case GPROF_FROMS:
		return (sysctl_handle_opaque(oidp, 
			gp->froms, gp->fromssize, req));
	case GPROF_TOS:
		return (sysctl_handle_opaque(oidp, 
			gp->tos, gp->tossize, req));
	case GPROF_GMONPARAM:
		return (sysctl_handle_opaque(oidp, gp, sizeof *gp, req));