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Date: Thu, 16 Jul 2009 14:29:03 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: linux-kernel@...r.kernel.org
Cc: akpm@...ux-foundation.org, kosaki.motohiro@...fujitsu.com,
fengguang.wu@...el.com, minchan.kim@...il.com, riel@...hat.com
Subject: Re: + mm-vmstat-add-isolate-pages.patch added to -mm tree
On Wed, 15 Jul 2009 20:21:36 -0700
akpm@...ux-foundation.org wrote:
> ------------------------------------------------------
> Subject: mm: vmstat: add isolate pages
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
>
Hi, Kosaki,
> If the system is running a heavy load of processes then concurrent reclaim
> can isolate a large number of pages from the LRU. /proc/meminfo and the
> output generated for an OOM do not show how many pages were isolated.
>
<snip>
> @@ -742,6 +746,13 @@ int migrate_pages(struct list_head *from
> struct page *page2;
> int swapwrite = current->flags & PF_SWAPWRITE;
> int rc;
> + int flags;
unsigned long.
> +
> + 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);
>
-Kame
> if (!swapwrite)
> current->flags |= PF_SWAPWRITE;
> diff -puN mm/page_alloc.c~mm-vmstat-add-isolate-pages mm/page_alloc.c
> --- a/mm/page_alloc.c~mm-vmstat-add-isolate-pages
> +++ a/mm/page_alloc.c
> @@ -2144,16 +2144,18 @@ void show_free_areas(void)
> }
> }
>
> - printk("Active_anon:%lu active_file:%lu inactive_anon:%lu\n"
> - " inactive_file:%lu"
> + printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n"
> + " active_file:%lu inactive_file:%lu isolated_file:%lu\n"
> " unevictable:%lu"
> " dirty:%lu writeback:%lu unstable:%lu buffer:%lu\n"
> " free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n"
> " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n",
> global_page_state(NR_ACTIVE_ANON),
> - global_page_state(NR_ACTIVE_FILE),
> global_page_state(NR_INACTIVE_ANON),
> + global_page_state(NR_ISOLATED_ANON),
> + global_page_state(NR_ACTIVE_FILE),
> global_page_state(NR_INACTIVE_FILE),
> + global_page_state(NR_ISOLATED_FILE),
> global_page_state(NR_UNEVICTABLE),
> global_page_state(NR_FILE_DIRTY),
> global_page_state(NR_WRITEBACK),
> @@ -2181,6 +2183,8 @@ void show_free_areas(void)
> " active_file:%lukB"
> " inactive_file:%lukB"
> " unevictable:%lukB"
> + " isolated(anon):%lukB"
> + " isolated(file):%lukB"
> " present:%lukB"
> " mlocked:%lukB"
> " dirty:%lukB"
> @@ -2207,6 +2211,8 @@ void show_free_areas(void)
> K(zone_page_state(zone, NR_ACTIVE_FILE)),
> K(zone_page_state(zone, NR_INACTIVE_FILE)),
> K(zone_page_state(zone, NR_UNEVICTABLE)),
> + K(zone_page_state(zone, NR_ISOLATED_ANON)),
> + K(zone_page_state(zone, NR_ISOLATED_FILE)),
> K(zone->present_pages),
> K(zone_page_state(zone, NR_MLOCK)),
> K(zone_page_state(zone, NR_FILE_DIRTY)),
> diff -puN mm/vmscan.c~mm-vmstat-add-isolate-pages mm/vmscan.c
> --- a/mm/vmscan.c~mm-vmstat-add-isolate-pages
> +++ a/mm/vmscan.c
> @@ -1067,6 +1067,8 @@ static unsigned long shrink_inactive_lis
> unsigned long nr_active;
> unsigned int count[NR_LRU_LISTS] = { 0, };
> int mode = lumpy_reclaim ? ISOLATE_BOTH : ISOLATE_INACTIVE;
> + unsigned long nr_anon;
> + unsigned long nr_file;
>
> nr_taken = sc->isolate_pages(sc->swap_cluster_max,
> &page_list, &nr_scan, sc->order, mode,
> @@ -1097,6 +1099,10 @@ static unsigned long shrink_inactive_lis
> __mod_zone_page_state(zone, NR_INACTIVE_ANON,
> -count[LRU_INACTIVE_ANON]);
>
> + nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
> + nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
> + __mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon);
> + __mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file);
>
> reclaim_stat->recent_scanned[0] += count[LRU_INACTIVE_ANON];
> reclaim_stat->recent_scanned[0] += count[LRU_ACTIVE_ANON];
> @@ -1164,6 +1170,9 @@ static unsigned long shrink_inactive_lis
> spin_lock_irq(&zone->lru_lock);
> }
> }
> + __mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
> + __mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
> +
> } while (nr_scanned < max_scan);
>
> done:
> @@ -1274,6 +1283,7 @@ static void shrink_active_list(unsigned
> __mod_zone_page_state(zone, NR_ACTIVE_FILE, -nr_taken);
> else
> __mod_zone_page_state(zone, NR_ACTIVE_ANON, -nr_taken);
> + __mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken);
> spin_unlock_irq(&zone->lru_lock);
>
> while (!list_empty(&l_hold)) {
> @@ -1324,7 +1334,7 @@ static void shrink_active_list(unsigned
> LRU_ACTIVE + file * LRU_FILE);
> move_active_pages_to_lru(zone, &l_inactive,
> LRU_BASE + file * LRU_FILE);
> -
> + __mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
> spin_unlock_irq(&zone->lru_lock);
> }
>
> diff -puN mm/vmstat.c~mm-vmstat-add-isolate-pages mm/vmstat.c
> --- a/mm/vmstat.c~mm-vmstat-add-isolate-pages
> +++ a/mm/vmstat.c
> @@ -644,6 +644,8 @@ static const char * const vmstat_text[]
> "nr_bounce",
> "nr_vmscan_write",
> "nr_writeback_temp",
> + "nr_isolated_anon",
> + "nr_isolated_file",
> "nr_shmem",
> #ifdef CONFIG_NUMA
> "numa_hit",
> _
>
> Patches currently in -mm which might be from kosaki.motohiro@...fujitsu.com are
>
> linux-next.patch
> mm-copy-over-oom_adj-value-at-fork-time.patch
> readahead-add-blk_run_backing_dev.patch
> readahead-add-blk_run_backing_dev-fix.patch
> readahead-add-blk_run_backing_dev-fix-fix-2.patch
> mm-clean-up-page_remove_rmap.patch
> mm-show_free_areas-display-slab-pages-in-two-separate-fields.patch
> mm-oom-analysis-add-per-zone-statistics-to-show_free_areas.patch
> mm-oom-analysis-add-buffer-cache-information-to-show_free_areas.patch
> mm-oom-analysis-show-kernel-stack-usage-in-proc-meminfo-and-oom-log-output.patch
> mm-oom-analysis-add-shmem-vmstat.patch
> mm-rename-pgmoved-variable-in-shrink_active_list.patch
> mm-shrink_inactive_list-nr_scan-accounting-fix-fix.patch
> mm-vmstat-add-isolate-pages.patch
> getrusage-fill-ru_maxrss-value.patch
> getrusage-fill-ru_maxrss-value-update.patch
> fs-symlink-write_begin-allocation-context-fix-reiser4-fix.patch
>
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