From: Nick Piggin <[email protected]>
Explicitly teach kswapd about the incremental min logic instead of just scanning
all zones under the first low zone. This should keep more even pressure applied
on the zones.
The new shrink_zone() logic exposes the very worst side of the current
balance_pgdat() function. Without this patch reclaim is limited to ZONE_DMA.
Signed-off-by: Nick Piggin <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
mm/vmscan.c | 97 +++++++++++++++++++++---------------------------------------
1 file changed, 34 insertions(+), 63 deletions(-)
Index: linux-2.6-git/mm/vmscan.c
===================================================================
--- linux-2.6-git.orig/mm/vmscan.c
+++ linux-2.6-git/mm/vmscan.c
@@ -790,46 +790,18 @@ loop_again:
}
for (priority = DEF_PRIORITY; priority >= 0; priority--) {
- int end_zone = 0; /* Inclusive. 0 = ZONE_DMA */
unsigned long lru_pages = 0;
+ all_zones_ok = 1;
+ sc.nr_scanned = 0;
+ sc.nr_reclaimed = 0;
+ sc.priority = priority;
+ sc.swap_cluster_max = nr_pages ? nr_pages : SWAP_CLUSTER_MAX;
+
/* The swap token gets in the way of swapout... */
if (!priority)
disable_swap_token();
- all_zones_ok = 1;
-
- if (nr_pages == 0) {
- /*
- * Scan in the highmem->dma direction for the highest
- * zone which needs scanning
- */
- for (i = pgdat->nr_zones - 1; i >= 0; i--) {
- struct zone *zone = pgdat->node_zones + i;
-
- if (zone->present_pages == 0)
- continue;
-
- if (zone->all_unreclaimable &&
- priority != DEF_PRIORITY)
- continue;
-
- if (!zone_watermark_ok(zone, order,
- zone->pages_high, 0, 0)) {
- end_zone = i;
- goto scan;
- }
- }
- goto out;
- } else {
- end_zone = pgdat->nr_zones - 1;
- }
-scan:
- for (i = 0; i <= end_zone; i++) {
- struct zone *zone = pgdat->node_zones + i;
-
- lru_pages += zone->nr_active + zone->nr_inactive;
- }
/*
* Now scan the zone in the dma->highmem direction, stopping
@@ -840,51 +812,51 @@ scan:
* pages behind kswapd's direction of progress, which would
* cause too much scanning of the lower zones.
*/
- for (i = 0; i <= end_zone; i++) {
+ for (i = 0; i <= pgdat->nr_zones; i++) {
struct zone *zone = pgdat->node_zones + i;
- int nr_slab;
if (zone->present_pages == 0)
continue;
+ if (nr_pages == 0) { /* Not software suspend */
+ if (zone_watermark_ok(zone, order,
+ zone->pages_high, 0, 0))
+ continue;
+
+ all_zones_ok = 0;
+ }
+
if (zone->all_unreclaimable && priority != DEF_PRIORITY)
continue;
- if (nr_pages == 0) { /* Not software suspend */
- if (!zone_watermark_ok(zone, order,
- zone->pages_high, end_zone, 0))
- all_zones_ok = 0;
- }
zone->temp_priority = priority;
if (zone->prev_priority > priority)
zone->prev_priority = priority;
- sc.nr_scanned = 0;
- sc.nr_reclaimed = 0;
- sc.priority = priority;
- sc.swap_cluster_max = nr_pages? nr_pages : SWAP_CLUSTER_MAX;
+ lru_pages += zone->nr_active + zone->nr_inactive;
+
atomic_inc(&zone->reclaim_in_progress);
shrink_zone(zone, &sc);
atomic_dec(&zone->reclaim_in_progress);
- reclaim_state->reclaimed_slab = 0;
- nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
- lru_pages);
- sc.nr_reclaimed += reclaim_state->reclaimed_slab;
- total_reclaimed += sc.nr_reclaimed;
- total_scanned += sc.nr_scanned;
- if (zone->all_unreclaimable)
- continue;
- if (nr_slab == 0 && zone->pages_scanned >=
+
+ if (zone->pages_scanned >=
(zone->nr_active + zone->nr_inactive) * 4)
zone->all_unreclaimable = 1;
- /*
- * If we've done a decent amount of scanning and
- * the reclaim ratio is low, start doing writepage
- * even in laptop mode
- */
- if (total_scanned > SWAP_CLUSTER_MAX * 2 &&
- total_scanned > total_reclaimed+total_reclaimed/2)
- sc.may_writepage = 1;
}
+ reclaim_state->reclaimed_slab = 0;
+ shrink_slab(sc.nr_scanned, GFP_KERNEL, lru_pages);
+ sc.nr_reclaimed += reclaim_state->reclaimed_slab;
+ total_reclaimed += sc.nr_reclaimed;
+ total_scanned += sc.nr_scanned;
+
+ /*
+ * If we've done a decent amount of scanning and
+ * the reclaim ratio is low, start doing writepage
+ * even in laptop mode
+ */
+ if (total_scanned > SWAP_CLUSTER_MAX * 2 &&
+ total_scanned > total_reclaimed+total_reclaimed/2)
+ sc.may_writepage = 1;
+
if (nr_pages && to_free > total_reclaimed)
continue; /* swsusp: need to do more work */
if (all_zones_ok)
@@ -905,7 +877,6 @@ scan:
if ((total_reclaimed >= SWAP_CLUSTER_MAX) && (!nr_pages))
break;
}
-out:
for (i = 0; i < pgdat->nr_zones; i++) {
struct zone *zone = pgdat->node_zones + i;
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
