From: Xin Hao <vernhao@xxxxxxxxxxx>
With this patch, we can see the distribution of pages of different orders on
each cpu, just like below.
#cat /proc/zoneinfo
....
cpu: 2
total_count: 14286
order0 : 1260
order1 : 13
order2 : 42
order3 : 4
order4 : 0
order5 : 0
order6 : 0
order7 : 0
order8 : 0
order9 : 25
order10: 0
order11: 0
order12: 0
high: 14541
batch: 63
Signed-off-by: Xin Hao <vernhao@xxxxxxxxxxx>
---
include/linux/mmzone.h | 1 +
mm/page_alloc.c | 4 ++++
mm/vmstat.c | 18 ++++++++++++------
3 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 883168776fea..55d25b4f51e5 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -684,6 +684,7 @@ enum zone_watermarks {
struct per_cpu_pages {
spinlock_t lock; /* Protects lists field */
int total_count; /* total number of pages in the list */
+ int count[NR_PCP_LISTS]; /* per-order page counts */
int high; /* high watermark, emptying needed */
int high_min; /* min high watermark */
int high_max; /* max high watermark */
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4e91e429b8d1..7ec2dc5c5ea5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1228,6 +1228,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
list_del(&page->pcp_list);
count -= nr_pages;
pcp->total_count -= nr_pages;
+ pcp->count[order] -= 1;
/* MIGRATE_ISOLATE page should not go to pcplists */
VM_BUG_ON_PAGE(is_migrate_isolate(mt), page);
@@ -2478,6 +2479,7 @@ static void free_unref_page_commit(struct zone *zone, struct per_cpu_pages *pcp,
pindex = order_to_pindex(migratetype, order);
list_add(&page->pcp_list, &pcp->lists[pindex]);
pcp->total_count += 1 << order;
+ pcp->count[order] += 1;
batch = READ_ONCE(pcp->batch);
/*
@@ -2858,6 +2860,7 @@ struct page *__rmqueue_pcplist(struct zone *zone, unsigned int order,
migratetype, alloc_flags);
pcp->total_count += alloced << order;
+ pcp->count[order] += alloced;
if (unlikely(list_empty(list)))
return NULL;
}
@@ -2865,6 +2868,7 @@ struct page *__rmqueue_pcplist(struct zone *zone, unsigned int order,
page = list_first_entry(list, struct page, pcp_list);
list_del(&page->pcp_list);
pcp->total_count -= 1 << order;
+ pcp->count[order] -= 1;
} while (check_new_pages(page, order));
return page;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c1e8096ff0a6..e04300ec450f 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1735,19 +1735,25 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
seq_printf(m, "\n pagesets");
for_each_online_cpu(i) {
+ int j;
struct per_cpu_pages *pcp;
struct per_cpu_zonestat __maybe_unused *pzstats;
pcp = per_cpu_ptr(zone->per_cpu_pageset, i);
seq_printf(m,
"\n cpu: %i"
- "\n count: %i"
- "\n high: %i"
- "\n batch: %i",
+ "\n total_count: %i",
i,
- pcp->total_count,
- pcp->high,
- pcp->batch);
+ pcp->total_count);
+ for (j = 0; j < NR_PCP_LISTS; j++)
+ seq_printf(m,
+ "\n order%-2i: %-3i",
+ j, pcp->count[j]);
+ seq_printf(m,
+ "\n high: %i"
+ "\n batch: %i",
+ pcp->high,
+ pcp->batch);
#ifdef CONFIG_SMP
pzstats = per_cpu_ptr(zone->per_cpu_zonestats, i);
seq_printf(m, "\n vm stats threshold: %d",
--
2.31.1
