From a731286de62294b63d8ceb3c5914ac52cc17e690 Mon Sep 17 00:00:00 2001 From: KOSAKI Motohiro Date: Mon, 21 Sep 2009 17:01:37 -0700 Subject: mm: vmstat: add isolate pages If the system is running a heavy load of processes then concurrent reclaim can isolate a large number of pages from the LRU. /proc/vmstat and the output generated for an OOM do not show how many pages were isolated. This has been observed during process fork bomb testing (mstctl11 in LTP). This patch shows the information about isolated pages. Reproduced via: ----------------------- % ./hackbench 140 process 1000 => OOM occur active_anon:146 inactive_anon:0 isolated_anon:49245 active_file:79 inactive_file:18 isolated_file:113 unevictable:0 dirty:0 writeback:0 unstable:0 buffer:39 free:370 slab_reclaimable:309 slab_unreclaimable:5492 mapped:53 shmem:15 pagetables:28140 bounce:0 Signed-off-by: KOSAKI Motohiro Acked-by: Rik van Riel Acked-by: Wu Fengguang Reviewed-by: Minchan Kim Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/migrate.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'mm/migrate.c') diff --git a/mm/migrate.c b/mm/migrate.c index 37143b92448..b535a2c1656 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -67,6 +67,8 @@ int putback_lru_pages(struct list_head *l) list_for_each_entry_safe(page, page2, l, lru) { list_del(&page->lru); + dec_zone_page_state(page, NR_ISOLATED_ANON + + !!page_is_file_cache(page)); putback_lru_page(page); count++; } @@ -698,6 +700,8 @@ unlock: * restored. */ list_del(&page->lru); + dec_zone_page_state(page, NR_ISOLATED_ANON + + !!page_is_file_cache(page)); putback_lru_page(page); } @@ -742,6 +746,13 @@ int migrate_pages(struct list_head *from, struct page *page2; int swapwrite = current->flags & PF_SWAPWRITE; int rc; + unsigned long flags; + + local_irq_save(flags); + list_for_each_entry(page, from, lru) + __inc_zone_page_state(page, NR_ISOLATED_ANON + + !!page_is_file_cache(page)); + local_irq_restore(flags); if (!swapwrite) current->flags |= PF_SWAPWRITE; -- cgit v1.2.3