Function pmap_delayed_invl_page

freebsd/amd64/amd64/pmap.c:1170–1182

* Mark the page m's PV list as participating in the current thread's * DI block. Any threads concurrently using m's PV list to remove or * restrict all mappings to m will wait for the current thread's DI * block to complete before proceeding. * * The function works by setting the DI generation number for m's PV * list to at least the DI generation number of the current thread. * This force

 * current thread calls pmap_delayed_invl_finish().
 */
static void
pmap_delayed_invl_page(vm_page_t m)
{
	u_long gen, *m_gen;

	rw_assert(VM_PAGE_TO_PV_LIST_LOCK(m), RA_WLOCKED);
	gen = curthread->td_md.md_invl_gen.gen;
	if (gen == 0)
		return;
	m_gen = pmap_delayed_invl_genp(m);
	if (*m_gen < gen)
		*m_gen = gen;
}

/*
 * Crashdump maps.