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Differential D22674 Diff 66064 head/sys/vm/vm_swapout.c

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head/sys/vm/vm_swapout.c

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static void vm_swapout_object_deactivate(pmap_t, vm_object_t, long); static void vm_swapout_object_deactivate(pmap_t, vm_object_t, long);
static void swapout_procs(int action); static void swapout_procs(int action);
static void vm_req_vmdaemon(int req); static void vm_req_vmdaemon(int req);
static void vm_thread_swapout(struct thread *td); static void vm_thread_swapout(struct thread *td);
static void static void
vm_swapout_object_deactivate_page(pmap_t pmap, vm_page_t m, bool unmap) vm_swapout_object_deactivate_page(pmap_t pmap, vm_page_t m, bool unmap)
{ {
int act_delta;
if (vm_page_tryxbusy(m) == 0)
return;
VM_CNT_INC(v_pdpages);
/* /*
* The page may acquire a wiring after this check. * Ignore unreclaimable wired pages. Repeat the check after busying
* The page daemon handles wired pages, so there is * since a busy holder may wire the page.
* no harm done if a wiring appears while we are
* attempting to deactivate the page.
*/ */
if (vm_page_wired(m) || !vm_page_tryxbusy(m))
return;
if (vm_page_wired(m) || !pmap_page_exists_quick(pmap, m)) { if (vm_page_wired(m) || !pmap_page_exists_quick(pmap, m)) {
vm_page_xunbusy(m); vm_page_xunbusy(m);
return; return;
} }
act_delta = pmap_ts_referenced(m); if (!pmap_is_referenced(m)) {
vm_page_lock(m); vm_page_lock(m);
if ((m->a.flags & PGA_REFERENCED) != 0) { if (!vm_page_active(m))
if (act_delta == 0)
act_delta = 1;
vm_page_aflag_clear(m, PGA_REFERENCED);
}
if (!vm_page_active(m) && act_delta != 0) {
vm_page_activate(m);
m->a.act_count += act_delta;
} else if (vm_page_active(m)) {
/*
* The page daemon does not requeue pages
* after modifying their activation count.
*/
if (act_delta == 0) {
m->a.act_count -= min(m->a.act_count, ACT_DECLINE);
if (unmap && m->a.act_count == 0) {
(void)vm_page_try_remove_all(m); (void)vm_page_try_remove_all(m);
else if (unmap && vm_page_try_remove_all(m))
vm_page_deactivate(m); vm_page_deactivate(m);
}
} else {
vm_page_activate(m);
if (m->a.act_count < ACT_MAX - ACT_ADVANCE)
m->a.act_count += ACT_ADVANCE;
}
} else if (vm_page_inactive(m))
(void)vm_page_try_remove_all(m);
vm_page_unlock(m); vm_page_unlock(m);
}
vm_page_xunbusy(m); vm_page_xunbusy(m);
} }
/* /*
* vm_swapout_object_deactivate * vm_swapout_object_deactivate
* *
* Deactivate enough pages to satisfy the inactive target * Deactivate enough pages to satisfy the inactive target
* requirements. * requirements.
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