Messages in this thread Patch in this message | | | Date | Sat, 01 Mar 2008 21:13:44 +0900 | From | KOSAKI Motohiro <> | Subject | Re: [patch 06/21] split LRU lists into anon & file sets |
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Hi
>@@ -1128,64 +1026,65 @@ static void shrink_active_list(unsigned (snip) > + /* > + * For sorting active vs inactive pages, we'll use the 'anon' > + * elements of the local list[] array and sort out the file vs > + * anon pages below. > + */
IMHO this comment implies code is not so good...
I think shrink_active_list should not change to indexed array. because this function almost use no indexed array operation.
the following is only explain my intention patch.
--- mm/vmscan.c | 29 +++++++++++------------------ 1 file changed, 11 insertions(+), 18 deletions(-)
Index: b/mm/vmscan.c =================================================================== --- a/mm/vmscan.c 2008-03-01 21:11:03.000000000 +0900 +++ b/mm/vmscan.c 2008-03-01 21:13:13.000000000 +0900 @@ -1023,14 +1023,12 @@ static void shrink_active_list(unsigned int pgdeactivate = 0; unsigned long pgscanned; LIST_HEAD(l_hold); /* The pages which were snipped off */ - struct list_head list[NR_LRU_LISTS]; + LIST_HEAD(l_active); + LIST_HEAD(l_inactive); struct page *page; struct pagevec pvec; enum lru_list lru; - for_each_lru(lru) - INIT_LIST_HEAD(&list[lru]); - lru_add_drain(); spin_lock_irq(&zone->lru_lock); pgmoved = sc->isolate_pages(nr_pages, &l_hold, &pgscanned, sc->order, @@ -1048,19 +1046,14 @@ static void shrink_active_list(unsigned __mod_zone_page_state(zone, NR_ACTIVE_ANON, -pgmoved); spin_unlock_irq(&zone->lru_lock); - /* - * For sorting active vs inactive pages, we'll use the 'anon' - * elements of the local list[] array and sort out the file vs - * anon pages below. - */ while (!list_empty(&l_hold)) { - lru = LRU_INACTIVE_ANON; cond_resched(); page = lru_to_page(&l_hold); list_del(&page->lru); if (page_referenced(page, 0, sc->mem_cgroup)) - lru = LRU_ACTIVE_ANON; - list_add(&page->lru, &list[lru]); + list_add(&page->lru, &l_active); + else + list_add(&page->lru, &l_inactive); } /* @@ -1071,9 +1064,9 @@ static void shrink_active_list(unsigned pgmoved = 0; lru = LRU_BASE + file * LRU_FILE; spin_lock_irq(&zone->lru_lock); - while (!list_empty(&list[LRU_INACTIVE_ANON])) { - page = lru_to_page(&list[LRU_INACTIVE_ANON]); - prefetchw_prev_lru_page(page, &list[LRU_INACTIVE_ANON], flags); + while (!list_empty(&l_inactive)) { + page = lru_to_page(&l_inactive); + prefetchw_prev_lru_page(page, &l_inactive, flags); VM_BUG_ON(PageLRU(page)); SetPageLRU(page); VM_BUG_ON(!PageActive(page)); @@ -1104,9 +1097,9 @@ static void shrink_active_list(unsigned pgmoved = 0; lru = LRU_ACTIVE + file * LRU_FILE; - while (!list_empty(&list[LRU_ACTIVE_ANON])) { - page = lru_to_page(&list[LRU_ACTIVE_ANON]); - prefetchw_prev_lru_page(page, &list[LRU_ACTIVE_ANON], flags); + while (!list_empty(&l_active)) { + page = lru_to_page(&l_active); + prefetchw_prev_lru_page(page, &l_active, flags); VM_BUG_ON(PageLRU(page)); SetPageLRU(page); VM_BUG_ON(!PageActive(page));
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