Now that the free block count for each migration types in
/proc/pagetypeinfo may not show the exact count if it excceeds
100,000. Users may not know how much more the counts will be. As the
free_area structure has already tracked the total free block count in
nr_free, we may as well print it out with no additional cost. That will
give users a rough idea of where the upper bounds will be.
If there is no overflow, the presence of the total counts will also
enable us to check if the nr_free counts match the total number of
entries in the free lists.
Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
---
mm/vmstat.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c5b82fdf54af..172946d8f358 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1373,6 +1373,7 @@ static void pagetypeinfo_showfree_print(struct seq_file *m,
pg_data_t *pgdat, struct zone *zone)
{
int order, mtype;
+ struct free_area *area;
unsigned long iteration_count = 0;
for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) {
@@ -1382,7 +1383,6 @@ static void pagetypeinfo_showfree_print(struct seq_file *m,
migratetype_names[mtype]);
for (order = 0; order < MAX_ORDER; ++order) {
unsigned long freecount = 0;
- struct free_area *area;
struct list_head *curr;
bool overflow = false;
@@ -1419,6 +1419,17 @@ static void pagetypeinfo_showfree_print(struct seq_file *m,
}
seq_putc(m, '\n');
}
+
+ /*
+ * List total free blocks per order
+ */
+ seq_printf(m, "Node %4d, zone %8s, total ",
+ pgdat->node_id, zone->name);
+ for (order = 0; order < MAX_ORDER; ++order) {
+ area = &(zone->free_area[order]);
+ seq_printf(m, "%6lu ", area->nr_free);
+ }
+ seq_putc(m, '\n');
}
/* Print out the free pages at each order for each migatetype */
--
2.18.1
