[RFC PATCH v4 23/40] mm: Fix vmstat to also account for freepages in the region allocator

["Srivatsa S. Bhat" <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>]

Currently vmstat considers only the freepages present in the buddy freelists
of the page allocator. But with the newly introduced region allocator in
place, freepages could be present in the region allocator as well. So teach
vmstat to take them into consideration when reporting free memory.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
---

 mm/vmstat.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index bb44d30..4dc103e 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -868,6 +868,8 @@ static void frag_show_print(struct seq_file *m, pg_data_t *pgdat,
 {
 	int i, order, t;
 	struct free_area *area;
+	struct free_area_region *reg_area;
+	struct region_allocator *reg_alloc;
 
 	seq_printf(m, "Node %d, zone %8s \n", pgdat->node_id, zone->name);
 
@@ -884,6 +886,12 @@ static void frag_show_print(struct seq_file *m, pg_data_t *pgdat,
 				nr_free +=
 					area->free_list[t].mr_list[i].nr_free;
 			}
+
+			/* Add up freepages in the region allocator as well */
+			reg_alloc = &zone->region_allocator;
+			reg_area = &reg_alloc->region[i].region_area[order];
+			nr_free += reg_area->nr_free;
+
 			seq_printf(m, "%6lu ", nr_free);
 		}
 		seq_putc(m, '\n');

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