Function arc_init

freebsd/contrib/openzfs/module/zfs/arc.c:7598–7704

	arc_c_max = arc_default_max(arc_c_min, allmem);
}
void
arc_init(void)
{
	uint64_t percent, allmem = arc_all_memory();
	mutex_init(&arc_evict_lock, NULL, MUTEX_DEFAULT, NULL);
	list_create(&arc_evict_waiters, sizeof (arc_evict_waiter_t),
	    offsetof(arc_evict_waiter_t, aew_node));

	arc_min_prefetch_ms = 1000;
	arc_min_prescient_prefetch_ms = 6000;

#if defined(_KERNEL)
	arc_lowmem_init();
#endif

	arc_set_limits(allmem);

#ifndef _KERNEL
	/*
	 * In userland, there's only the memory pressure that we artificially
	 * create (see arc_available_memory()).  Don't let arc_c get too
	 * small, because it can cause transactions to be larger than
	 * arc_c, causing arc_tempreserve_space() to fail.
	 */
	arc_c_min = MAX(arc_c_max / 2, 2ULL << SPA_MAXBLOCKSHIFT);
#endif

	arc_c = arc_c_min;
	arc_p = (arc_c >> 1);

	/* Set min to 1/2 of arc_c_min */
	arc_meta_min = 1ULL << SPA_MAXBLOCKSHIFT;
	/* Initialize maximum observed usage to zero */
	arc_meta_max = 0;
	/*
	 * Set arc_meta_limit to a percent of arc_c_max with a floor of
	 * arc_meta_min, and a ceiling of arc_c_max.
	 */
	percent = MIN(zfs_arc_meta_limit_percent, 100);
	arc_meta_limit = MAX(arc_meta_min, (percent * arc_c_max) / 100);
	percent = MIN(zfs_arc_dnode_limit_percent, 100);
	arc_dnode_size_limit = (percent * arc_meta_limit) / 100;

	/* Apply user specified tunings */
	arc_tuning_update(B_TRUE);

	/* if kmem_flags are set, lets try to use less memory */
	if (kmem_debugging())
		arc_c = arc_c / 2;
	if (arc_c < arc_c_min)
		arc_c = arc_c_min;

	arc_register_hotplug();

	arc_state_init();

	buf_init();