Function qc_import

freebsd/kern/subr_vmem.c:549–566

* Import from the arena into the quantum cache in UMA. * * We use VMEM_ADDR_QCACHE_MIN instead of 0: uma_zalloc() returns 0 to indicate * failure, so UMA can't be used to cache a resource with value 0. */

 * failure, so UMA can't be used to cache a resource with value 0.
 */
static int
qc_import(void *arg, void **store, int cnt, int domain, int flags)
{
	qcache_t *qc;
	vmem_addr_t addr;
	int i;

	KASSERT((flags & M_WAITOK) == 0, ("blocking allocation"));

	qc = arg;
	for (i = 0; i < cnt; i++) {
		if (vmem_xalloc(qc->qc_vmem, qc->qc_size, 0, 0, 0,
		    VMEM_ADDR_QCACHE_MIN, VMEM_ADDR_MAX, flags, &addr) != 0)
			break;
		store[i] = (void *)addr;
	}
	return (i);
}

/*
 * Release memory from the UMA cache to the arena.