The patch titled
mm: shrink_all_memory(): use sc.nr_reclaimed
has been added to the -mm tree. Its filename is
mm-shrink_all_memory-use-scnr_reclaimed.patch
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------------------------------------------------------
Subject: mm: shrink_all_memory(): use sc.nr_reclaimed
From: MinChan Kim <minchan.kim@xxxxxxxxx>
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.
shrink_all_memory() can use the same mechanism. it increase code
consistency and redability.
Signed-off-by: MinChan Kim <minchan.kim@xxxxxxxxx>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 43 ++++++++++++++++++++++---------------------
1 file changed, 22 insertions(+), 21 deletions(-)
diff -puN mm/vmscan.c~mm-shrink_all_memory-use-scnr_reclaimed mm/vmscan.c
--- a/mm/vmscan.c~mm-shrink_all_memory-use-scnr_reclaimed
+++ a/mm/vmscan.c
@@ -2048,16 +2048,15 @@ 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;
@@ -2080,14 +2079,16 @@ static unsigned long shrink_all_zones(un
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;
}
/*
@@ -2101,7 +2102,6 @@ static unsigned long shrink_all_zones(un
unsigned long shrink_all_memory(unsigned long nr_pages)
{
unsigned long lru_pages, nr_slab;
- unsigned long ret = 0;
int pass;
struct reclaim_state reclaim_state;
struct scan_control sc = {
@@ -2123,8 +2123,8 @@ unsigned long shrink_all_memory(unsigned
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 >= nr_pages)
goto out;
nr_slab -= reclaim_state.reclaimed_slab;
@@ -2146,18 +2146,18 @@ unsigned long shrink_all_memory(unsigned
sc.may_unmap = 1;
for (prio = DEF_PRIORITY; prio >= 0; prio--) {
- unsigned long nr_to_scan = nr_pages - ret;
+ unsigned long nr_to_scan = nr_pages - 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 >= nr_pages)
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 >= nr_pages)
goto out;
if (sc.nr_scanned && prio < DEF_PRIORITY - 2)
@@ -2166,21 +2166,22 @@ unsigned long shrink_all_memory(unsigned
}
/*
- * 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);
+ sc.nr_reclaimed += reclaim_state.reclaimed_slab;
+ } while (sc.nr_reclaimed < nr_pages && reclaim_state.reclaimed_slab > 0);
}
+
out:
current->reclaim_state = NULL;
- return ret;
+ return sc.nr_reclaimed;
}
#endif
_
Patches currently in -mm which might be from minchan.kim@xxxxxxxxx are
origin.patch
vmap-remove-needless-lock-and-list-in-vmap.patch
vmscan-rename-scmay_swap-to-may_unmap.patch
mm-shrink_all_memory-use-scnr_reclaimed.patch
mm-shrink_all_memory-use-scnr_reclaimed-checkpatch-fixes.patch
vmscan-clip-swap_cluster_max-in-shrink_all_memory.patch
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