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Date: Mon, 14 Jun 2010 12:17:51 +0100
From: Mel Gorman <mel@....ul.ie>
To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org
Cc: Dave Chinner <david@...morbit.com>,
Chris Mason <chris.mason@...cle.com>,
Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
Johannes Weiner <hannes@...xchg.org>,
Christoph Hellwig <hch@...radead.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mel Gorman <mel@....ul.ie>
Subject: [PATCH 10/12] vmscan: Update isolated page counters outside of main path in shrink_inactive_list()
When shrink_inactive_list() isolates pages, it updates a number of
counters using temporary variables to gather them. These consume stack
and it's in the main path that calls ->writepage(). This patch moves the
accounting updates outside of the main path to reduce stack usage.
Signed-off-by: Mel Gorman <mel@....ul.ie>
Reviewed-by: Johannes Weiner <hannes@...xchg.org>
---
mm/vmscan.c | 63 +++++++++++++++++++++++++++++++++++-----------------------
1 files changed, 38 insertions(+), 25 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 165c2f5..019f0af 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1073,7 +1073,8 @@ static unsigned long clear_active_flags(struct list_head *page_list,
ClearPageActive(page);
nr_active++;
}
- count[lru]++;
+ if (count)
+ count[lru]++;
}
return nr_active;
@@ -1153,12 +1154,13 @@ static int too_many_isolated(struct zone *zone, int file,
* TODO: Try merging with migrations version of putback_lru_pages
*/
static noinline_for_stack void putback_lru_pages(struct zone *zone,
- struct zone_reclaim_stat *reclaim_stat,
+ struct scan_control *sc,
unsigned long nr_anon, unsigned long nr_file,
struct list_head *page_list)
{
struct page *page;
struct pagevec pvec;
+ struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
pagevec_init(&pvec, 1);
@@ -1197,6 +1199,37 @@ static noinline_for_stack void putback_lru_pages(struct zone *zone,
pagevec_release(&pvec);
}
+static noinline_for_stack void update_isolated_counts(struct zone *zone,
+ struct scan_control *sc,
+ unsigned long *nr_anon,
+ unsigned long *nr_file,
+ struct list_head *isolated_list)
+{
+ unsigned long nr_active;
+ unsigned int count[NR_LRU_LISTS] = { 0, };
+ struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
+
+ nr_active = clear_active_flags(isolated_list, count);
+ __count_vm_events(PGDEACTIVATE, nr_active);
+
+ __mod_zone_page_state(zone, NR_ACTIVE_FILE,
+ -count[LRU_ACTIVE_FILE]);
+ __mod_zone_page_state(zone, NR_INACTIVE_FILE,
+ -count[LRU_INACTIVE_FILE]);
+ __mod_zone_page_state(zone, NR_ACTIVE_ANON,
+ -count[LRU_ACTIVE_ANON]);
+ __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] += *nr_anon;
+ reclaim_stat->recent_scanned[1] += *nr_file;
+}
+
/*
* shrink_inactive_list() is a helper for shrink_zone(). It returns the number
* of reclaimed pages
@@ -1208,10 +1241,8 @@ static noinline_for_stack unsigned long shrink_inactive_list(unsigned long nr_to
LIST_HEAD(page_list);
unsigned long nr_scanned;
unsigned long nr_reclaimed = 0;
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
unsigned long nr_taken;
unsigned long nr_active;
- unsigned int count[NR_LRU_LISTS] = { 0, };
unsigned long nr_anon;
unsigned long nr_file;
@@ -1256,25 +1287,7 @@ static noinline_for_stack unsigned long shrink_inactive_list(unsigned long nr_to
return 0;
}
- nr_active = clear_active_flags(&page_list, count);
- __count_vm_events(PGDEACTIVATE, nr_active);
-
- __mod_zone_page_state(zone, NR_ACTIVE_FILE,
- -count[LRU_ACTIVE_FILE]);
- __mod_zone_page_state(zone, NR_INACTIVE_FILE,
- -count[LRU_INACTIVE_FILE]);
- __mod_zone_page_state(zone, NR_ACTIVE_ANON,
- -count[LRU_ACTIVE_ANON]);
- __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] += nr_anon;
- reclaim_stat->recent_scanned[1] += nr_file;
+ update_isolated_counts(zone, sc, &nr_anon, &nr_file, &page_list);
spin_unlock_irq(&zone->lru_lock);
@@ -1293,7 +1306,7 @@ static noinline_for_stack unsigned long shrink_inactive_list(unsigned long nr_to
* The attempt at page out may have made some
* of the pages active, mark them inactive again.
*/
- nr_active = clear_active_flags(&page_list, count);
+ nr_active = clear_active_flags(&page_list, NULL);
count_vm_events(PGDEACTIVATE, nr_active);
nr_reclaimed += shrink_page_list(&page_list, sc, PAGEOUT_IO_SYNC);
@@ -1304,7 +1317,7 @@ static noinline_for_stack unsigned long shrink_inactive_list(unsigned long nr_to
__count_vm_events(KSWAPD_STEAL, nr_reclaimed);
__count_zone_vm_events(PGSTEAL, zone, nr_reclaimed);
- putback_lru_pages(zone, reclaim_stat, nr_anon, nr_file, &page_list);
+ putback_lru_pages(zone, sc, nr_anon, nr_file, &page_list);
return nr_reclaimed;
}
--
1.7.1
--
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