Current cat /sys/kernel/debug/extfrag/extfrag_index and
/sys/kernel/debug/extfrag/unusable_index is not friendly to userspace.
We should add order's information so that users can clearly understand
the situation of each order at a glance like pagetypeinfo.
befor:
cat /sys/kernel/debug/extfrag/extfrag_index:
Node 0, zone DMA32 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 ...
Node 0, zone Normal -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 ...
cat /sys/kernel/debug/extfrag/unusable_index:
Node 0, zone DMA32 0.000 0.000 0.000 0.000 0.001 0.003 0.007 ...
Node 0, zone Normal 0.000 0.053 0.106 0.159 0.205 0.244 0.265 ...
after:
cat /sys/kernel/debug/extfrag/extfrag_index:
Extfrag index at order: 0 1 2 3 4 5 ...
Node 0, zone DMA -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 ...
Node 0, zone Normal -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 ...
cat /sys/kernel/debug/extfrag/unusable_index:
Unusable index at order: 0 1 2 3 4 5 ...
Node 0, zone DMA 0.000 0.030 0.059 0.085 0.096 0.102 ...
Node 0, zone Normal 0.000 0.225 0.427 0.569 0.776 0.827 ...
Signed-off-by: Hao Ge <gehao@xxxxxxxxxx>
---
mm/vmstat.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/mm/vmstat.c b/mm/vmstat.c
index db79935e4a54..f604d91e904c 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -2178,7 +2178,7 @@ static void unusable_show_print(struct seq_file *m,
int index;
struct contig_page_info info;
- seq_printf(m, "Node %d, zone %8s ",
+ seq_printf(m, "Node %d, zone %11s ",
pgdat->node_id,
zone->name);
for (order = 0; order < NR_PAGE_ORDERS; ++order) {
@@ -2201,12 +2201,19 @@ static void unusable_show_print(struct seq_file *m,
*/
static int unusable_show(struct seq_file *m, void *arg)
{
+ int order;
pg_data_t *pgdat = (pg_data_t *)arg;
/* check memoryless node */
if (!node_state(pgdat->node_id, N_MEMORY))
return 0;
+ /* Print header */
+ seq_printf(m, "%s ", "Unusable index at order:");
+ for (order = 0; order < NR_PAGE_ORDERS; ++order)
+ seq_printf(m, "%5d ", order);
+ seq_putc(m, '\n');
+
walk_zones_in_node(m, pgdat, true, false, unusable_show_print);
return 0;
@@ -2230,7 +2237,7 @@ static void extfrag_show_print(struct seq_file *m,
/* Alloc on stack as interrupts are disabled for zone walk */
struct contig_page_info info;
- seq_printf(m, "Node %d, zone %8s ",
+ seq_printf(m, "Node %d, zone %10s ",
pgdat->node_id,
zone->name);
for (order = 0; order < NR_PAGE_ORDERS; ++order) {
@@ -2247,8 +2254,15 @@ static void extfrag_show_print(struct seq_file *m,
*/
static int extfrag_show(struct seq_file *m, void *arg)
{
+ int order;
pg_data_t *pgdat = (pg_data_t *)arg;
+ /* Print header */
+ seq_printf(m, "%s ", "Extfrag index at order:");
+ for (order = 0; order < NR_PAGE_ORDERS; ++order)
+ seq_printf(m, "%6d ", order);
+ seq_putc(m, '\n');
+
walk_zones_in_node(m, pgdat, true, false, extfrag_show_print);
return 0;
--
2.25.1
