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Date: Thu, 12 Feb 2009 16:33:10 +0900
From: MinChan Kim <minchan.kim@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
Johannes Weiner <hannes@...xchg.org>,
"Rafael J. Wysocki" <rjw@...k.pl>, Rik van Riel <riel@...hat.com>
Subject: [PATCH v2] shrink_all_memory() use sc.nr_reclaimed
Impact: cleanup
Commit a79311c14eae4bb946a97af25f3e1b17d625985d "vmscan: bail out of
direct reclaim after swap_cluster_max pages" moved the nr_reclaimed
counter into the scan control to accumulate the number of all
reclaimed pages in a reclaim invocation.
The shrink_all_memory() can use the same mechanism. it increases code
consistency and readability.
It's based on mmtom 2009-02-11-17-15.
Signed-off-by: MinChan Kim <minchan.kim@...il.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Rik van Riel <riel@...hat.com>
---
mm/vmscan.c | 51 ++++++++++++++++++++++++++++++---------------------
1 files changed, 30 insertions(+), 21 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index ae4202b..caa2de5 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2055,16 +2055,15 @@ unsigned long global_lru_pages(void)
#ifdef CONFIG_PM
/*
* Helper function for shrink_all_memory(). Tries to reclaim 'nr_pages' pages
- * from LRU lists system-wide, for given pass and priority, and returns the
- * number of reclaimed pages
+ * from LRU lists system-wide, for given pass and priority.
*
* For pass > 3 we also try to shrink the LRU lists that contain a few pages
*/
-static unsigned long shrink_all_zones(unsigned long nr_pages, int prio,
+static void shrink_all_zones(unsigned long nr_pages, int prio,
int pass, struct scan_control *sc)
{
struct zone *zone;
- unsigned long ret = 0;
+ unsigned long nr_reclaimed = 0;
for_each_populated_zone(zone) {
enum lru_list l;
@@ -2087,14 +2086,16 @@ static unsigned long shrink_all_zones(unsigned long nr_pages, int prio,
zone->lru[l].nr_scan = 0;
nr_to_scan = min(nr_pages, lru_pages);
- ret += shrink_list(l, nr_to_scan, zone,
+ nr_reclaimed += shrink_list(l, nr_to_scan, zone,
sc, prio);
- if (ret >= nr_pages)
- return ret;
+ if (nr_reclaimed >= nr_pages) {
+ sc->nr_reclaimed = nr_reclaimed;
+ return;
+ }
}
}
}
- return ret;
+ sc->nr_reclaimed = nr_reclaimed;
}
/*
@@ -2126,13 +2127,15 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
/* If slab caches are huge, it's better to hit them first */
while (nr_slab >= lru_pages) {
reclaim_state.reclaimed_slab = 0;
- shrink_slab(nr_pages, sc.gfp_mask, lru_pages);
+ shrink_slab(sc.swap_cluster_max, sc.gfp_mask, lru_pages);
if (!reclaim_state.reclaimed_slab)
break;
- ret += reclaim_state.reclaimed_slab;
- if (ret >= nr_pages)
+ sc.nr_reclaimed += reclaim_state.reclaimed_slab;
+ if (sc.nr_reclaimed >= sc.swap_cluster_max) {
+ ret = sc.nr_reclaimed;
goto out;
+ }
nr_slab -= reclaim_state.reclaimed_slab;
}
@@ -2153,19 +2156,23 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
sc.may_unmap = 1;
for (prio = DEF_PRIORITY; prio >= 0; prio--) {
- unsigned long nr_to_scan = nr_pages - ret;
+ unsigned long nr_to_scan = sc.swap_cluster_max - sc.nr_reclaimed;
sc.nr_scanned = 0;
- ret += shrink_all_zones(nr_to_scan, prio, pass, &sc);
- if (ret >= nr_pages)
+ shrink_all_zones(nr_to_scan, prio, pass, &sc);
+ if (sc.nr_reclaimed >= sc.swap_cluster_max) {
+ ret = sc.nr_reclaimed;
goto out;
+ }
reclaim_state.reclaimed_slab = 0;
shrink_slab(sc.nr_scanned, sc.gfp_mask,
global_lru_pages());
- ret += reclaim_state.reclaimed_slab;
- if (ret >= nr_pages)
+ sc.nr_reclaimed += reclaim_state.reclaimed_slab;
+ if (sc.nr_reclaimed >= sc.swap_cluster_max) {
+ ret = sc.nr_reclaimed;
goto out;
+ }
if (sc.nr_scanned && prio < DEF_PRIORITY - 2)
congestion_wait(WRITE, HZ / 10);
@@ -2173,17 +2180,19 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
}
/*
- * If ret = 0, we could not shrink LRUs, but there may be something
+ * If sc.nr_reclaimed = 0, we could not shrink LRUs, but there may be something
* in slab caches
*/
- if (!ret) {
+ if (!sc.nr_reclaimed) {
do {
reclaim_state.reclaimed_slab = 0;
- shrink_slab(nr_pages, sc.gfp_mask, global_lru_pages());
- ret += reclaim_state.reclaimed_slab;
- } while (ret < nr_pages && reclaim_state.reclaimed_slab > 0);
+ shrink_slab(sc.swap_cluster_max, sc.gfp_mask, global_lru_pages());
+ sc.nr_reclaimed += reclaim_state.reclaimed_slab;
+ } while (sc.nr_reclaimed < sc.swap_cluster_max && reclaim_state.reclaimed_slab > 0);
}
+ ret = sc.nr_reclaimed;
+
out:
current->reclaim_state = NULL;
--
1.5.4.3
--
Kinds Regards
MinChan Kim
--
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