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-rw-r--r--mm/vmscan.c62
1 files changed, 33 insertions, 29 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 1ef5a2eeb29..5faa7739487 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -52,6 +52,9 @@ struct scan_control {
/* Incremented by the number of inactive pages that were scanned */
unsigned long nr_scanned;
+ /* Number of pages freed so far during a call to shrink_zones() */
+ unsigned long nr_reclaimed;
+
/* This context's GFP mask */
gfp_t gfp_mask;
@@ -1400,12 +1403,11 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
/*
* This is a basic per-zone page freer. Used by both kswapd and direct reclaim.
*/
-static unsigned long shrink_zone(int priority, struct zone *zone,
+static void shrink_zone(int priority, struct zone *zone,
struct scan_control *sc)
{
unsigned long nr[NR_LRU_LISTS];
unsigned long nr_to_scan;
- unsigned long nr_reclaimed = 0;
unsigned long percent[2]; /* anon @ 0; file @ 1 */
enum lru_list l;
@@ -1446,10 +1448,21 @@ static unsigned long shrink_zone(int priority, struct zone *zone,
(unsigned long)sc->swap_cluster_max);
nr[l] -= nr_to_scan;
- nr_reclaimed += shrink_list(l, nr_to_scan,
+ sc->nr_reclaimed += shrink_list(l, nr_to_scan,
zone, sc, priority);
}
}
+ /*
+ * On large memory systems, scan >> priority can become
+ * really large. This is fine for the starting priority;
+ * we want to put equal scanning pressure on each zone.
+ * However, if the VM has a harder time of freeing pages,
+ * with multiple processes reclaiming pages, the total
+ * freeing target can get unreasonably large.
+ */
+ if (sc->nr_reclaimed > sc->swap_cluster_max &&
+ priority < DEF_PRIORITY && !current_is_kswapd())
+ break;
}
/*
@@ -1462,7 +1475,6 @@ static unsigned long shrink_zone(int priority, struct zone *zone,
shrink_active_list(SWAP_CLUSTER_MAX, zone, sc, priority, 0);
throttle_vm_writeout(sc->gfp_mask);
- return nr_reclaimed;
}
/*
@@ -1476,16 +1488,13 @@ static unsigned long shrink_zone(int priority, struct zone *zone,
* b) The zones may be over pages_high but they must go *over* pages_high to
* satisfy the `incremental min' zone defense algorithm.
*
- * Returns the number of reclaimed pages.
- *
* If a zone is deemed to be full of pinned pages then just give it a light
* scan then give up on it.
*/
-static unsigned long shrink_zones(int priority, struct zonelist *zonelist,
+static void shrink_zones(int priority, struct zonelist *zonelist,
struct scan_control *sc)
{
enum zone_type high_zoneidx = gfp_zone(sc->gfp_mask);
- unsigned long nr_reclaimed = 0;
struct zoneref *z;
struct zone *zone;
@@ -1516,10 +1525,8 @@ static unsigned long shrink_zones(int priority, struct zonelist *zonelist,
priority);
}
- nr_reclaimed += shrink_zone(priority, zone, sc);
+ shrink_zone(priority, zone, sc);
}
-
- return nr_reclaimed;
}
/*
@@ -1544,7 +1551,6 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
int priority;
unsigned long ret = 0;
unsigned long total_scanned = 0;
- unsigned long nr_reclaimed = 0;
struct reclaim_state *reclaim_state = current->reclaim_state;
unsigned long lru_pages = 0;
struct zoneref *z;
@@ -1572,7 +1578,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
sc->nr_scanned = 0;
if (!priority)
disable_swap_token();
- nr_reclaimed += shrink_zones(priority, zonelist, sc);
+ shrink_zones(priority, zonelist, sc);
/*
* Don't shrink slabs when reclaiming memory from
* over limit cgroups
@@ -1580,13 +1586,13 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
if (scan_global_lru(sc)) {
shrink_slab(sc->nr_scanned, sc->gfp_mask, lru_pages);
if (reclaim_state) {
- nr_reclaimed += reclaim_state->reclaimed_slab;
+ sc->nr_reclaimed += reclaim_state->reclaimed_slab;
reclaim_state->reclaimed_slab = 0;
}
}
total_scanned += sc->nr_scanned;
- if (nr_reclaimed >= sc->swap_cluster_max) {
- ret = nr_reclaimed;
+ if (sc->nr_reclaimed >= sc->swap_cluster_max) {
+ ret = sc->nr_reclaimed;
goto out;
}
@@ -1609,7 +1615,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
}
/* top priority shrink_zones still had more to do? don't OOM, then */
if (!sc->all_unreclaimable && scan_global_lru(sc))
- ret = nr_reclaimed;
+ ret = sc->nr_reclaimed;
out:
/*
* Now that we've scanned all the zones at this priority level, note
@@ -1704,7 +1710,6 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
int priority;
int i;
unsigned long total_scanned;
- unsigned long nr_reclaimed;
struct reclaim_state *reclaim_state = current->reclaim_state;
struct scan_control sc = {
.gfp_mask = GFP_KERNEL,
@@ -1723,7 +1728,7 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
loop_again:
total_scanned = 0;
- nr_reclaimed = 0;
+ sc.nr_reclaimed = 0;
sc.may_writepage = !laptop_mode;
count_vm_event(PAGEOUTRUN);
@@ -1809,11 +1814,11 @@ loop_again:
*/
if (!zone_watermark_ok(zone, order, 8*zone->pages_high,
end_zone, 0))
- nr_reclaimed += shrink_zone(priority, zone, &sc);
+ shrink_zone(priority, zone, &sc);
reclaim_state->reclaimed_slab = 0;
nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
lru_pages);
- nr_reclaimed += reclaim_state->reclaimed_slab;
+ sc.nr_reclaimed += reclaim_state->reclaimed_slab;
total_scanned += sc.nr_scanned;
if (zone_is_all_unreclaimable(zone))
continue;
@@ -1827,7 +1832,7 @@ loop_again:
* even in laptop mode
*/
if (total_scanned > SWAP_CLUSTER_MAX * 2 &&
- total_scanned > nr_reclaimed + nr_reclaimed / 2)
+ total_scanned > sc.nr_reclaimed + sc.nr_reclaimed / 2)
sc.may_writepage = 1;
}
if (all_zones_ok)
@@ -1845,7 +1850,7 @@ loop_again:
* matches the direct reclaim path behaviour in terms of impact
* on zone->*_priority.
*/
- if (nr_reclaimed >= SWAP_CLUSTER_MAX)
+ if (sc.nr_reclaimed >= SWAP_CLUSTER_MAX)
break;
}
out:
@@ -1867,7 +1872,7 @@ out:
goto loop_again;
}
- return nr_reclaimed;
+ return sc.nr_reclaimed;
}
/*
@@ -2219,7 +2224,6 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
struct task_struct *p = current;
struct reclaim_state reclaim_state;
int priority;
- unsigned long nr_reclaimed = 0;
struct scan_control sc = {
.may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
.may_swap = !!(zone_reclaim_mode & RECLAIM_SWAP),
@@ -2252,9 +2256,9 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
priority = ZONE_RECLAIM_PRIORITY;
do {
note_zone_scanning_priority(zone, priority);
- nr_reclaimed += shrink_zone(priority, zone, &sc);
+ shrink_zone(priority, zone, &sc);
priority--;
- } while (priority >= 0 && nr_reclaimed < nr_pages);
+ } while (priority >= 0 && sc.nr_reclaimed < nr_pages);
}
slab_reclaimable = zone_page_state(zone, NR_SLAB_RECLAIMABLE);
@@ -2278,13 +2282,13 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
* Update nr_reclaimed by the number of slab pages we
* reclaimed from this zone.
*/
- nr_reclaimed += slab_reclaimable -
+ sc.nr_reclaimed += slab_reclaimable -
zone_page_state(zone, NR_SLAB_RECLAIMABLE);
}
p->reclaim_state = NULL;
current->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE);
- return nr_reclaimed >= nr_pages;
+ return sc.nr_reclaimed >= nr_pages;
}
int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-23 22:59:48 +0000