Function uma_reclaim

freebsd/vm/uma_core.c:4957–4990

See uma.h */

/* See uma.h */
void
uma_reclaim(int req)
{

	CTR0(KTR_UMA, "UMA: vm asked us to release pages!");
	sx_xlock(&uma_reclaim_lock);
	bucket_enable();

	switch (req) {
	case UMA_RECLAIM_TRIM:
		zone_foreach(zone_trim, NULL);
		break;
	case UMA_RECLAIM_DRAIN:
	case UMA_RECLAIM_DRAIN_CPU:
		zone_foreach(zone_drain, NULL);
		if (req == UMA_RECLAIM_DRAIN_CPU) {
			pcpu_cache_drain_safe(NULL);
			zone_foreach(zone_drain, NULL);
		}
		break;
	default:
		panic("unhandled reclamation request %d", req);
	}

	/*
	 * Some slabs may have been freed but this zone will be visited early
	 * we visit again so that we can free pages that are empty once other
	 * zones are drained.  We have to do the same for buckets.
	 */
	zone_drain(slabzones[0], NULL);
	zone_drain(slabzones[1], NULL);
	bucket_zone_drain();
	sx_xunlock(&uma_reclaim_lock);
}

static volatile int uma_reclaim_needed;