[PATCH v2 2/2] mm: be more verbose about zonelist initialization

Michal Hocko
2019-02-13T09:40:34Z

From: Michal Hocko <mhocko@suse.com>

We have seen several bugs where zonelists have not been initialized
properly and it is not really straightforward to track those bugs down.
One way to help a bit at least is to dump zonelists of each node when
they are (re)initialized.

Signed-off-by: Michal Hocko <mhocko@suse.com>
---
mm/page_alloc.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2e097f336126..02c843f0db4f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5234,6 +5234,7 @@ static void build_zonelists(pg_data_t *pgdat)
int node, load, nr_nodes = 0;
nodemask_t used_mask;
int local_node, prev_node;
+ struct zone *zone;

/* NUMA-aware ordering of nodes */
local_node = pgdat->node_id;
@@ -5259,6 +5260,11 @@ static void build_zonelists(pg_data_t *pgdat)

build_zonelists_in_node_order(pgdat, node_order, nr_nodes);
build_thisnode_zonelists(pgdat);
+
+ pr_info("node[%d] zonelist: ", pgdat->node_id);
+ for_each_zone_zonelist(zone, z, &pgdat->node_zonelists[ZONELIST_FALLBACK], MAX_NR_ZONES-1)
+ pr_cont("%d:%s ", zone_to_nid(zone), zone->name);
+ pr_cont("\n");
}

#ifdef CONFIG_HAVE_MEMORYLESS_NODES
--
2.20.1