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Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d3488828331a..46711f080f38 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2227,7 +2227,7 @@ static bool pgdat_balanced(pg_data_t *pgdat, unsigned long balanced_pages,
}
/* is kswapd sleeping prematurely? */
-static int sleeping_prematurely(pg_data_t *pgdat, int order, long remaining)
+static bool sleeping_prematurely(pg_data_t *pgdat, int order, long remaining)
{
int i;
unsigned long balanced = 0;
@@ -2237,7 +2237,7 @@ static int sleeping_prematurely(pg_data_t *pgdat, int order, long remaining)
if (remaining)
return 1;
- /* If after HZ/10, a zone is below the high mark, it's premature */
+ /* Check the watermark levels */
for (i = 0; i < pgdat->nr_zones; i++) {
struct zone *zone = pgdat->node_zones + i;
@@ -2269,7 +2269,7 @@ static int sleeping_prematurely(pg_data_t *pgdat, int order, long remaining)
* For kswapd, balance_pgdat() will work across all this node's zones until
* they are all at high_wmark_pages(zone).
*
- * Returns the number of pages which were actually freed.
+ * Returns the final order kswapd was reclaiming at
*
* There is special handling here for zones which are full of pinned pages.
* This can happen if the pages are all mlocked, or if they are all used by
@@ -2532,7 +2532,13 @@ out:
}
}
- return sc.nr_reclaimed;
+ /*
+ * Return the order we were reclaiming at so sleeping_prematurely()
+ * makes a decision on the order we were last reclaiming at. However,
+ * if another caller entered the allocator slow path while kswapd
+ * was awake, order will remain at the higher level
+ */
+ return order;
}
static void kswapd_try_to_sleep(pg_data_t *pgdat, int order)
@@ -2659,7 +2665,7 @@ static int kswapd(void *p)
*/
if (!ret) {
trace_mm_vmscan_kswapd_wake(pgdat->node_id, order);
- balance_pgdat(pgdat, order, classzone_idx);
+ order = balance_pgdat(pgdat, order, classzone_idx);
}
}
return 0;