diff options
Diffstat (limited to 'sys/vm/vm_pageout.c')
| -rw-r--r-- | sys/vm/vm_pageout.c | 86 |
1 files changed, 2 insertions, 84 deletions
diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c index cb4c1bfbf580..cabb102077a8 100644 --- a/sys/vm/vm_pageout.c +++ b/sys/vm/vm_pageout.c @@ -65,7 +65,7 @@ * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. * - * $Id: vm_pageout.c,v 1.20 1994/04/20 07:07:15 davidg Exp $ + * $Id: vm_pageout.c,v 1.3 1994/06/06 11:56:27 davidg Exp $ */ /* @@ -102,7 +102,7 @@ extern int swap_pager_ready(); #define MAXSCAN 512 /* maximum number of pages to scan in active queue */ /* set the "clock" hands to be (MAXSCAN * 4096) Bytes */ #define ACT_DECLINE 1 -#define ACT_ADVANCE 6 +#define ACT_ADVANCE 3 #define ACT_MAX 300 #define LOWATER ((2048*1024)/NBPG) @@ -724,88 +724,6 @@ rescan1: return force_wakeup; } -void -vm_pagescan() -{ - int maxscan, pages_scanned, pages_referenced, nextscan, scantick = hz/20; - int m_ref, next_ref; - vm_page_t m, next; - - (void) spl0(); - - nextscan = scantick; - -scanloop: - - pages_scanned = 0; - pages_referenced = 0; - maxscan = min(cnt.v_active_count, MAXSCAN); - - /* - * Gather statistics on page usage. - */ - m = vm_page_queue_active.tqh_first; - while (m && (maxscan-- > 0)) { - - ++pages_scanned; - - next = m->pageq.tqe_next; - - /* - * Dont mess with pages that are busy. - */ - if ((m->flags & PG_BUSY) || (m->hold_count != 0)) { - m = next; - continue; - } - - /* - * Advance pages that have been referenced, decline pages that - * have not. - */ - if (pmap_is_referenced(VM_PAGE_TO_PHYS(m))) { - pmap_clear_reference(VM_PAGE_TO_PHYS(m)); - pages_referenced++; - if (m->act_count < ACT_MAX) - m->act_count += ACT_ADVANCE; - TAILQ_REMOVE(&vm_page_queue_active, m, pageq); - TAILQ_INSERT_TAIL(&vm_page_queue_active, m, pageq); - TAILQ_REMOVE(&m->object->memq, m, listq); - TAILQ_INSERT_TAIL(&m->object->memq, m, listq); - } else { - m->act_count -= min(m->act_count, ACT_DECLINE); - /* - * if the page act_count is zero, and we are low on mem -- then we deactivate - */ - if (!m->act_count && - (cnt.v_free_count+cnt.v_inactive_count < cnt.v_free_target+cnt.v_inactive_target )) { - vm_page_deactivate(m); - /* - * else if on the next go-around we will deactivate the page - * we need to place the page on the end of the queue to age - * the other pages in memory. - */ - } else { - TAILQ_REMOVE(&vm_page_queue_active, m, pageq); - TAILQ_INSERT_TAIL(&vm_page_queue_active, m, pageq); - TAILQ_REMOVE(&m->object->memq, m, listq); - TAILQ_INSERT_TAIL(&m->object->memq, m, listq); - } - } - m = next; - } - - if (pages_referenced) { - nextscan = (pages_scanned / pages_referenced) * scantick; - nextscan = max(nextscan, scantick); - nextscan = min(nextscan, hz); - } else - nextscan = hz; - tsleep((caddr_t) &vm_pagescanner, PVM, "scanw", nextscan); - - goto scanloop; -} - /* * vm_pageout is the high level pageout daemon. */ |