linux-kernel - [PATCH] mm/vmstat: Add order's information for extfrag_index and unusable

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Message-Id: <20240228113332.358801-1-gehao@kylinos.cn>
Date: Wed, 28 Feb 2024 19:33:32 +0800
From: Hao Ge <gehao@...inos.cn>
To: akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	gehao618@....com,
	Hao Ge <gehao@...inos.cn>
Subject: [PATCH] mm/vmstat: Add order's information for extfrag_index and unusable_index

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@...inos.cn>
---
 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