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Date: Fri, 1 Aug 2014 14:45:25 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Michal Hocko <mhocko@...e.cz>
Cc: Jerome Marchand <jmarchan@...hat.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 2/2] memcg, vmscan: Fix forced scan of anonymous pages
On Thu, Jul 31, 2014 at 02:30:26PM +0200, Michal Hocko wrote:
> On Thu 31-07-14 13:49:45, Jerome Marchand wrote:
> > @@ -1950,8 +1950,11 @@ static void get_scan_count(struct lruvec *lruvec, int swappiness,
> > */
> > if (global_reclaim(sc)) {
> > unsigned long free = zone_page_state(zone, NR_FREE_PAGES);
> > + unsigned long zonefile =
> > + zone_page_state(zone, NR_LRU_BASE + LRU_ACTIVE_FILE) +
> > + zone_page_state(zone, NR_LRU_BASE + LRU_INACTIVE_FILE);
> >
> > - if (unlikely(file + free <= high_wmark_pages(zone))) {
> > + if (unlikely(zonefile + free <= high_wmark_pages(zone))) {
> > scan_balance = SCAN_ANON;
> > goto out;
> > }
>
> You could move file and anon further down when we actually use them.
Agreed with that. Can we merge this into the original patch?
---
>From e49bef8d2751d9b27f1733e3e0eced325ffce700 Mon Sep 17 00:00:00 2001
From: Johannes Weiner <hannes@...xchg.org>
Date: Fri, 1 Aug 2014 10:48:26 -0400
Subject: [patch] memcg, vmscan: Fix forced scan of anonymous pages fix -
cleanups
o Use enum zone_stat_item symbols directly to select zone stats,
rather than NR_LRU_BASE plus LRU index
o scanned/rotated scaling is the only user of the lruvec anon/file
counters, so move the reads of those values to right before that
Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
mm/vmscan.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b3f629bdf4fe..2836b5373b2e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1934,11 +1934,6 @@ static void get_scan_count(struct lruvec *lruvec, int swappiness,
goto out;
}
- anon = get_lru_size(lruvec, LRU_ACTIVE_ANON) +
- get_lru_size(lruvec, LRU_INACTIVE_ANON);
- file = get_lru_size(lruvec, LRU_ACTIVE_FILE) +
- get_lru_size(lruvec, LRU_INACTIVE_FILE);
-
/*
* Prevent the reclaimer from falling into the cache trap: as
* cache pages start out inactive, every cache fault will tip
@@ -1949,12 +1944,14 @@ static void get_scan_count(struct lruvec *lruvec, int swappiness,
* anon pages. Try to detect this based on file LRU size.
*/
if (global_reclaim(sc)) {
- unsigned long free = zone_page_state(zone, NR_FREE_PAGES);
- unsigned long zonefile =
- zone_page_state(zone, NR_LRU_BASE + LRU_ACTIVE_FILE) +
- zone_page_state(zone, NR_LRU_BASE + LRU_INACTIVE_FILE);
+ unsigned long zonefile;
+ unsigned long zonefree;
+
+ zonefree = zone_page_state(zone, NR_FREE_PAGES);
+ zonefile = zone_page_state(zone, NR_ACTIVE_FILE) +
+ zone_page_state(zone, NR_INACTIVE_FILE);
- if (unlikely(zonefile + free <= high_wmark_pages(zone))) {
+ if (unlikely(zonefile + zonefree <= high_wmark_pages(zone))) {
scan_balance = SCAN_ANON;
goto out;
}
@@ -1989,6 +1986,12 @@ static void get_scan_count(struct lruvec *lruvec, int swappiness,
*
* anon in [0], file in [1]
*/
+
+ anon = get_lru_size(lruvec, LRU_ACTIVE_ANON) +
+ get_lru_size(lruvec, LRU_INACTIVE_ANON);
+ file = get_lru_size(lruvec, LRU_ACTIVE_FILE) +
+ get_lru_size(lruvec, LRU_INACTIVE_FILE);
+
spin_lock_irq(&zone->lru_lock);
if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
reclaim_stat->recent_scanned[0] /= 2;
--
2.0.3
--
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