From 934725ca775139858bf29cab5438d4a3b55620f9 Mon Sep 17 00:00:00 2001
From: Liangcai Fan <liangcaifan19@gmail.com>
Date: Fri, 5 Nov 2021 13:40:37 -0700
Subject: [PATCH] mm/page_alloc.c: show watermark_boost of zone in zoneinfo
References: bsc#1190208 (MM functional and performance backports)
Patch-mainline: v5.16-rc1
Git-commit: a6ea8b5b9f1ce3403a1c8516035d653006741e80
min/low/high_wmark_pages(z) is defined as
(z->_watermark[WMARK_MIN/LOW/HIGH] + z->watermark_boost)
If kswapd is frequently woken up due to the increase of
min/low/high_wmark_pages, printing watermark_boost can quickly locate
whether watermark_boost or _watermark[WMARK_MIN/LOW/HIGH] caused
min/low/high_wmark_pages to increase.
Link: https://lkml.kernel.org/r/1632472566-12246-1-git-send-email-liangcaifan19@gmail.com
Signed-off-by: Liangcai Fan <liangcaifan19@gmail.com>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
mm/page_alloc.c | 2 ++
mm/vmstat.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f5d068f9022e..def88c43c482 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5968,6 +5968,7 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
printk(KERN_CONT
"%s"
" free:%lukB"
+ " boost:%lukB"
" min:%lukB"
" low:%lukB"
" high:%lukB"
@@ -5988,6 +5989,7 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
"\n",
zone->name,
K(zone_page_state(zone, NR_FREE_PAGES)),
+ K(zone->watermark_boost),
K(min_wmark_pages(zone)),
K(low_wmark_pages(zone)),
K(high_wmark_pages(zone)),
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 56bd8523e0e5..2c31e689a254 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1655,6 +1655,7 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
}
seq_printf(m,
"\n pages free %lu"
+ "\n boost %lu"
"\n min %lu"
"\n low %lu"
"\n high %lu"
@@ -1663,6 +1664,7 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
"\n managed %lu"
"\n cma %lu",
zone_page_state(zone, NR_FREE_PAGES),
+ zone->watermark_boost,
min_wmark_pages(zone),
low_wmark_pages(zone),
high_wmark_pages(zone),