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Re: [PATCH 01/34] mm, vmstat: add infrastructure for per-node vmstats

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  Re: [PATCH 01/34] mm, vmstat: add infrastructure for per-node vmstats Reza Arbab <arbab@linux.vnet.ibm.com> - 2016-08-03 22:50 +0200

#1456020 — Re: [PATCH 01/34] mm, vmstat: add infrastructure for per-node vmstats

On Fri, Jul 08, 2016 at 10:34:37AM +0100, Mel Gorman wrote:
> void refresh_zone_stat_thresholds(void)
> {
[...]
>+	/* Zero current pgdat thresholds */
>+	for_each_online_pgdat(pgdat) {
>+		for_each_online_cpu(cpu) {
>+			per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->stat_threshold = 0;
>+		}
>+	}

I am oopsing here, for a node whose pgdat->per_cpu_nodestats is NULL.

The node in question is memoryless, so in setup_per_cpu_pageset(), the 
loop over its populated zones doesn't run, and the per_cpu_nodestat 
struct isn't allocated.

This patch fixes things for me:

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ea759b9..5221e17 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5271,9 +5271,17 @@ static void __meminit setup_zone_pageset(struct zone *zone)
  void __init setup_per_cpu_pageset(void)
  {
  	struct zone *zone;
+	struct pglist_data *pgdat;
  
  	for_each_populated_zone(zone)
  		setup_zone_pageset(zone);
+
+	for_each_online_pgdat(pgdat) {
+		if (!pgdat->per_cpu_nodestats) {
+			pgdat->per_cpu_nodestats =
+				alloc_percpu(struct per_cpu_nodestat);
+		}
+	}
  }
  
  static noinline __init_refok


-- 
Reza Arbab

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