Function vm_page_init_cache_zones

freebsd/vm/vm_page.c:208–238

* The cache page zone is initialized later since we need to be able to allocate * pages before UMA is fully initialized. */

 * pages before UMA is fully initialized.
 */
static void
vm_page_init_cache_zones(void *dummy __unused)
{
	struct vm_domain *vmd;
	struct vm_pgcache *pgcache;
	int cache, domain, maxcache, pool;

	maxcache = 0;
	TUNABLE_INT_FETCH("vm.pgcache_zone_max_pcpu", &maxcache);
	maxcache *= mp_ncpus;
	for (domain = 0; domain < vm_ndomains; domain++) {
		vmd = VM_DOMAIN(domain);
		for (pool = 0; pool < VM_NFREEPOOL; pool++) {
			pgcache = &vmd->vmd_pgcache[pool];
			pgcache->domain = domain;
			pgcache->pool = pool;
			pgcache->zone = uma_zcache_create("vm pgcache",
			    PAGE_SIZE, NULL, NULL, NULL, NULL,
			    vm_page_zone_import, vm_page_zone_release, pgcache,
			    UMA_ZONE_VM);

			/*
			 * Limit each pool's zone to 0.1% of the pages in the
			 * domain.
			 */
			cache = maxcache != 0 ? maxcache :
			    vmd->vmd_page_count / 1000;
			uma_zone_set_maxcache(pgcache->zone, cache);
		}
	}
}
SYSINIT(vm_page2, SI_SUB_VM_CONF, SI_ORDER_ANY, vm_page_init_cache_zones, NULL);

/* Make sure that u_long is at least 64 bits when PAGE_SIZE is 32K. */