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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 <kosaki.motohiro@jp.fujitsu.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Wu Fengguang <fengguang.wu@intel.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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parent
b35ea17b7b
commit
a731286de6
5 changed files with 35 additions and 4 deletions
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@ -100,6 +100,8 @@ enum zone_stat_item {
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NR_BOUNCE,
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NR_VMSCAN_WRITE,
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NR_WRITEBACK_TEMP, /* Writeback using temporary buffers */
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NR_ISOLATED_ANON, /* Temporary isolated pages from anon lru */
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NR_ISOLATED_FILE, /* Temporary isolated pages from file lru */
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NR_SHMEM, /* shmem pages (included tmpfs/GEM pages) */
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#ifdef CONFIG_NUMA
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NUMA_HIT, /* allocated in intended node */
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11
mm/migrate.c
11
mm/migrate.c
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@ -67,6 +67,8 @@ int putback_lru_pages(struct list_head *l)
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list_for_each_entry_safe(page, page2, l, lru) {
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list_del(&page->lru);
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dec_zone_page_state(page, NR_ISOLATED_ANON +
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!!page_is_file_cache(page));
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putback_lru_page(page);
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count++;
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}
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@ -698,6 +700,8 @@ unlock:
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* restored.
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*/
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list_del(&page->lru);
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dec_zone_page_state(page, NR_ISOLATED_ANON +
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!!page_is_file_cache(page));
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putback_lru_page(page);
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}
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@ -742,6 +746,13 @@ int migrate_pages(struct list_head *from,
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struct page *page2;
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int swapwrite = current->flags & PF_SWAPWRITE;
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int rc;
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unsigned long flags;
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local_irq_save(flags);
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list_for_each_entry(page, from, lru)
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__inc_zone_page_state(page, NR_ISOLATED_ANON +
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!!page_is_file_cache(page));
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local_irq_restore(flags);
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if (!swapwrite)
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current->flags |= PF_SWAPWRITE;
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@ -2134,16 +2134,18 @@ void show_free_areas(void)
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}
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}
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printk("Active_anon:%lu active_file:%lu inactive_anon:%lu\n"
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" inactive_file:%lu"
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printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n"
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" active_file:%lu inactive_file:%lu isolated_file:%lu\n"
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" unevictable:%lu"
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" dirty:%lu writeback:%lu unstable:%lu buffer:%lu\n"
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" free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n"
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" mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n",
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global_page_state(NR_ACTIVE_ANON),
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global_page_state(NR_ACTIVE_FILE),
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global_page_state(NR_INACTIVE_ANON),
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global_page_state(NR_ISOLATED_ANON),
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global_page_state(NR_ACTIVE_FILE),
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global_page_state(NR_INACTIVE_FILE),
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global_page_state(NR_ISOLATED_FILE),
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global_page_state(NR_UNEVICTABLE),
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global_page_state(NR_FILE_DIRTY),
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global_page_state(NR_WRITEBACK),
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@ -2171,6 +2173,8 @@ void show_free_areas(void)
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" active_file:%lukB"
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" inactive_file:%lukB"
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" unevictable:%lukB"
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" isolated(anon):%lukB"
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" isolated(file):%lukB"
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" present:%lukB"
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" mlocked:%lukB"
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" dirty:%lukB"
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@ -2197,6 +2201,8 @@ void show_free_areas(void)
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K(zone_page_state(zone, NR_ACTIVE_FILE)),
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K(zone_page_state(zone, NR_INACTIVE_FILE)),
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K(zone_page_state(zone, NR_UNEVICTABLE)),
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K(zone_page_state(zone, NR_ISOLATED_ANON)),
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K(zone_page_state(zone, NR_ISOLATED_FILE)),
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K(zone->present_pages),
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K(zone_page_state(zone, NR_MLOCK)),
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K(zone_page_state(zone, NR_FILE_DIRTY)),
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12
mm/vmscan.c
12
mm/vmscan.c
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@ -1072,6 +1072,8 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
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unsigned long nr_active;
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unsigned int count[NR_LRU_LISTS] = { 0, };
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int mode = lumpy_reclaim ? ISOLATE_BOTH : ISOLATE_INACTIVE;
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unsigned long nr_anon;
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unsigned long nr_file;
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nr_taken = sc->isolate_pages(sc->swap_cluster_max,
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&page_list, &nr_scan, sc->order, mode,
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@ -1102,6 +1104,10 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
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__mod_zone_page_state(zone, NR_INACTIVE_ANON,
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-count[LRU_INACTIVE_ANON]);
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nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
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nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
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__mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon);
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__mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file);
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reclaim_stat->recent_scanned[0] += count[LRU_INACTIVE_ANON];
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reclaim_stat->recent_scanned[0] += count[LRU_ACTIVE_ANON];
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@ -1169,6 +1175,9 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
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spin_lock_irq(&zone->lru_lock);
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}
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}
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__mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
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__mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
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} while (nr_scanned < max_scan);
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done:
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@ -1279,6 +1288,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
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__mod_zone_page_state(zone, NR_ACTIVE_FILE, -nr_taken);
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else
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__mod_zone_page_state(zone, NR_ACTIVE_ANON, -nr_taken);
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__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken);
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spin_unlock_irq(&zone->lru_lock);
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while (!list_empty(&l_hold)) {
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@ -1329,7 +1339,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
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LRU_ACTIVE + file * LRU_FILE);
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move_active_pages_to_lru(zone, &l_inactive,
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LRU_BASE + file * LRU_FILE);
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__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
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spin_unlock_irq(&zone->lru_lock);
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}
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@ -644,6 +644,8 @@ static const char * const vmstat_text[] = {
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"nr_bounce",
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"nr_vmscan_write",
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"nr_writeback_temp",
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"nr_isolated_anon",
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"nr_isolated_file",
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"nr_shmem",
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#ifdef CONFIG_NUMA
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"numa_hit",
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