From 9d5e6a9f22311b00a20ff9b072760ad3e73f0d99 Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Thu, 19 May 2016 17:12:38 -0700 Subject: mm: update_lru_size do the __mod_zone_page_state Konstantin Khlebnikov pointed out (nearly four years ago, when lumpy reclaim was removed) that lru_size can be updated by -nr_taken once per call to isolate_lru_pages(), instead of page by page. Update it inside isolate_lru_pages(), or at its two callsites? I chose to update it at the callsites, rearranging and grouping the updates by nr_taken and nr_scanned together in both. With one exception, mem_cgroup_update_lru_size(,lru,) is then used where __mod_zone_page_state(,NR_LRU_BASE+lru,) is used; and we shall be adding some more calls in a future commit. Make the code a little smaller and simpler by incorporating stat update in lru_size update. The exception was move_active_pages_to_lru(), which aggregated the pgmoved stat update separately from the individual lru_size updates; but I still think this a simplification worth making. However, the __mod_zone_page_state is not peculiar to mem_cgroups: so better use the name update_lru_size, calls mem_cgroup_update_lru_size when CONFIG_MEMCG. Signed-off-by: Hugh Dickins Cc: "Kirill A. Shutemov" Cc: Andrea Arcangeli Cc: Andres Lagar-Cavilla Cc: Yang Shi Cc: Ning Qu Cc: Mel Gorman Cc: Konstantin Khlebnikov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmscan.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) (limited to 'mm/vmscan.c') diff --git a/mm/vmscan.c b/mm/vmscan.c index d3a02ac3eed7..dcfdfc1a0942 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1374,7 +1374,6 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, for (scan = 0; scan < nr_to_scan && nr_taken < nr_to_scan && !list_empty(src); scan++) { struct page *page; - int nr_pages; page = lru_to_page(src); prefetchw_prev_lru_page(page, src, flags); @@ -1383,10 +1382,8 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, switch (__isolate_lru_page(page, mode)) { case 0: - nr_pages = hpage_nr_pages(page); - mem_cgroup_update_lru_size(lruvec, lru, -nr_pages); + nr_taken += hpage_nr_pages(page); list_move(&page->lru, dst); - nr_taken += nr_pages; break; case -EBUSY: @@ -1602,8 +1599,9 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec, nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &page_list, &nr_scanned, sc, isolate_mode, lru); - __mod_zone_page_state(zone, NR_LRU_BASE + lru, -nr_taken); + update_lru_size(lruvec, lru, -nr_taken); __mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken); + reclaim_stat->recent_scanned[file] += nr_taken; if (global_reclaim(sc)) { __mod_zone_page_state(zone, NR_PAGES_SCANNED, nr_scanned); @@ -1624,8 +1622,6 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec, spin_lock_irq(&zone->lru_lock); - reclaim_stat->recent_scanned[file] += nr_taken; - if (global_reclaim(sc)) { if (current_is_kswapd()) __count_zone_vm_events(PGSTEAL_KSWAPD, zone, @@ -1742,7 +1738,7 @@ static void move_active_pages_to_lru(struct lruvec *lruvec, SetPageLRU(page); nr_pages = hpage_nr_pages(page); - mem_cgroup_update_lru_size(lruvec, lru, nr_pages); + update_lru_size(lruvec, lru, nr_pages); list_move(&page->lru, &lruvec->lists[lru]); pgmoved += nr_pages; @@ -1760,7 +1756,7 @@ static void move_active_pages_to_lru(struct lruvec *lruvec, list_add(&page->lru, pages_to_free); } } - __mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved); + if (!is_active_lru(lru)) __count_vm_events(PGDEACTIVATE, pgmoved); } @@ -1794,14 +1790,15 @@ static void shrink_active_list(unsigned long nr_to_scan, nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &l_hold, &nr_scanned, sc, isolate_mode, lru); - if (global_reclaim(sc)) - __mod_zone_page_state(zone, NR_PAGES_SCANNED, nr_scanned); + update_lru_size(lruvec, lru, -nr_taken); + __mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken); reclaim_stat->recent_scanned[file] += nr_taken; + if (global_reclaim(sc)) + __mod_zone_page_state(zone, NR_PAGES_SCANNED, nr_scanned); __count_zone_vm_events(PGREFILL, zone, nr_scanned); - __mod_zone_page_state(zone, NR_LRU_BASE + lru, -nr_taken); - __mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken); + spin_unlock_irq(&zone->lru_lock); while (!list_empty(&l_hold)) { -- cgit v1.2.3