15  * 1. Redistributions of source code must retain the above copyright
62 #ifndef HZ
63 #  define	HZ 1000  macro
69 #    define	HZ_VM HZ
82 int	hz;				/* system clock's frequency */  variable
83 int	tick;				/* usec per tick (1000000 / hz) */
84 time_t	tick_seconds_max;		/* max hz * seconds an integer can hold */
85 struct bintime tick_bt;			/* bintime per tick (1s / hz) */
110 SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &hz, 0,
113     "Maximum hz value supported");
115     "Minimum hz value supported");
180 	hz = -1;  in init_param1()
181 	TUNABLE_INT_FETCH("kern.hz", &hz);  in init_param1()
182 	if (hz == -1)  in init_param1()
183 		hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ;  in init_param1()
185 	/* range check the "hz" value */  in init_param1()
186 	if (__predict_false(hz < HZ_MINIMUM))  in init_param1()
187 		hz = HZ_MINIMUM;  in init_param1()
188 	else if (__predict_false(hz > HZ_MAXIMUM))  in init_param1()
189 		hz = HZ_MAXIMUM;  in init_param1()
191 	tick = 1000000 / hz;  in init_param1()
192 	tick_sbt = SBT_1S / hz;  in init_param1()
194 	tick_seconds_max = INT_MAX / hz;  in init_param1()
200 	ticksl = INT_MAX - (hz * 10 * 60);  in init_param1()
202 	vn_lock_pair_pause_max = hz / 100;  in init_param1()
204 		vn_lock_pair_pause_max = 1;  in init_param1()
238 	 * 'ngroups_max + 1' computation (to obtain the size of the internal  in init_param1()
252 		const int ngroups_max_max = (1 << 24) - 1;  in init_param1()
314 	 * The default limit for maxfiles is 1/12 of the number of  in init_param2()
316 	 * At most it can be 1/6 the number of physical pages.  in init_param2()
335 	} else if (__bitcountl(maxphys) != 1) {	/* power of two */  in init_param2()
339 			maxphys = 1UL << flsl(maxphys);  in init_param2()
351 	 * The default for maxpipekva is min(1/64 of the kernel address space,  in init_param2()
352 	 * max(1/64 of main memory, 512KB)).  See sys_pipe.c for more details.  in init_param2()