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Date: Fri, 20 Jun 2014 12:33:49 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [patch 3/4] mm: vmscan: remove all_unreclaimable()
Direct reclaim currently calls shrink_zones() to reclaim all members
of a zonelist, and if that wasn't successful it does another pass
through the same zonelist to check overall reclaimability.
Just check reclaimability in shrink_zones() directly and propagate the
result through the return value. Then remove all_unreclaimable().
Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
mm/vmscan.c | 48 +++++++++++++++++++++++-------------------------
1 file changed, 23 insertions(+), 25 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index ed1efb84c542..d0bc1a209746 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2244,9 +2244,10 @@ static inline bool should_continue_reclaim(struct zone *zone,
}
}
-static void shrink_zone(struct zone *zone, struct scan_control *sc)
+static unsigned long shrink_zone(struct zone *zone, struct scan_control *sc)
{
unsigned long nr_reclaimed, nr_scanned;
+ unsigned long zone_reclaimed = 0;
do {
struct mem_cgroup *root = sc->target_mem_cgroup;
@@ -2290,8 +2291,12 @@ static void shrink_zone(struct zone *zone, struct scan_control *sc)
sc->nr_scanned - nr_scanned,
sc->nr_reclaimed - nr_reclaimed);
+ zone_reclaimed += sc->nr_reclaimed - nr_reclaimed;
+
} while (should_continue_reclaim(zone, sc->nr_reclaimed - nr_reclaimed,
sc->nr_scanned - nr_scanned, sc));
+
+ return zone_reclaimed;
}
/* Returns true if compaction should go ahead for a high-order request */
@@ -2340,8 +2345,10 @@ static inline bool compaction_ready(struct zone *zone, int order)
*
* If a zone is deemed to be full of pinned pages then just give it a light
* scan then give up on it.
+ *
+ * Returns whether the zones overall are reclaimable or not.
*/
-static void shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
+static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
{
struct zoneref *z;
struct zone *zone;
@@ -2354,6 +2361,7 @@ static void shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
.gfp_mask = sc->gfp_mask,
};
enum zone_type requested_highidx = gfp_zone(sc->gfp_mask);
+ bool all_unreclaimable = true;
/*
* If the number of buffer_heads in the machine exceeds the maximum
@@ -2368,6 +2376,8 @@ static void shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
for_each_zone_zonelist_nodemask(zone, z, zonelist,
gfp_zone(sc->gfp_mask), sc->nodemask) {
+ unsigned long zone_reclaimed = 0;
+
if (!populated_zone(zone))
continue;
/*
@@ -2414,10 +2424,15 @@ static void shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
&nr_soft_scanned);
sc->nr_reclaimed += nr_soft_reclaimed;
sc->nr_scanned += nr_soft_scanned;
+ zone_reclaimed += nr_soft_reclaimed;
/* need some check for avoid more shrink_zone() */
}
- shrink_zone(zone, sc);
+ zone_reclaimed += shrink_zone(zone, sc);
+
+ if (zone_reclaimed ||
+ (global_reclaim(sc) && zone_reclaimable(zone)))
+ all_unreclaimable = false;
}
/*
@@ -2439,26 +2454,8 @@ static void shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
* promoted it to __GFP_HIGHMEM.
*/
sc->gfp_mask = orig_mask;
-}
-/* All zones in zonelist are unreclaimable? */
-static bool all_unreclaimable(struct zonelist *zonelist,
- struct scan_control *sc)
-{
- struct zoneref *z;
- struct zone *zone;
-
- for_each_zone_zonelist_nodemask(zone, z, zonelist,
- gfp_zone(sc->gfp_mask), sc->nodemask) {
- if (!populated_zone(zone))
- continue;
- if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
- continue;
- if (zone_reclaimable(zone))
- return false;
- }
-
- return true;
+ return !all_unreclaimable;
}
/*
@@ -2482,6 +2479,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
{
unsigned long total_scanned = 0;
unsigned long writeback_threshold;
+ bool zones_reclaimable;
delayacct_freepages_start();
@@ -2492,7 +2490,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
vmpressure_prio(sc->gfp_mask, sc->target_mem_cgroup,
sc->priority);
sc->nr_scanned = 0;
- shrink_zones(zonelist, sc);
+ zones_reclaimable = shrink_zones(zonelist, sc);
total_scanned += sc->nr_scanned;
if (sc->nr_reclaimed >= sc->nr_to_reclaim)
@@ -2533,8 +2531,8 @@ out:
if (sc->compaction_ready)
return 1;
- /* top priority shrink_zones still had more to do? don't OOM, then */
- if (global_reclaim(sc) && !all_unreclaimable(zonelist, sc))
+ /* Any of the zones still reclaimable? Don't OOM. */
+ if (zones_reclaimable)
return 1;
return 0;
--
2.0.0
--
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