Please ignore this patch because I forgot to use checkpatch.pl to check for formatting issues. I will fix it and resend a new one,Sorry to bother you.
> On Feb 28, 2024, at 19:33, Hao Ge <gehao@xxxxxxxxxx> wrote:
>
> 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
