Function callout_callwheel_init

freebsd/kern/kern_timeout.c:271–308

* Kernel low level callwheel initialization * called on the BSP during kernel startup. */

 * called on the BSP during kernel startup.
 */
static void
callout_callwheel_init(void *dummy)
{
	struct callout_cpu *cc;
	int cpu;

	/*
	 * Calculate the size of the callout wheel and the preallocated
	 * timeout() structures.
	 * XXX: Clip callout to result of previous function of maxusers
	 * maximum 384.  This is still huge, but acceptable.
	 */
	ncallout = imin(16 + maxproc + maxfiles, 18508);
	TUNABLE_INT_FETCH("kern.ncallout", &ncallout);

	/*
	 * Calculate callout wheel size, should be next power of two higher
	 * than 'ncallout'.
	 */
	callwheelsize = 1 << fls(ncallout);
	callwheelmask = callwheelsize - 1;

	/*
	 * Fetch whether we're pinning the swi's or not.
	 */
	TUNABLE_INT_FETCH("kern.pin_default_swi", &pin_default_swi);
	TUNABLE_INT_FETCH("kern.pin_pcpu_swi", &pin_pcpu_swi);

	/*
	 * Initialize callout wheels.  The software interrupt threads
	 * are created later.
	 */
	cc_default_cpu = PCPU_GET(cpuid);
	CPU_FOREACH(cpu) {
		cc = CC_CPU(cpu);
		callout_cpu_init(cc, cpu);
	}
}
SYSINIT(callwheel_init, SI_SUB_CPU, SI_ORDER_ANY, callout_callwheel_init, NULL);

/*