[patch 114/262] mm/page_alloc.c: show watermark_boost of zone in zoneinfo

Andrew Morton
2021-11-05T20:40:40Z

From: Liangcai Fan <liangcaifan19@gmail.com>
Subject: mm/page_alloc.c: show watermark_boost of zone in zoneinfo

min/low/high_wmark_pages(z) is defined as
(z->_watermark[WMARK_MIN/LOW/HIGH] + z->watermark_boost).
If kswapd is frequently waked 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>
---

mm/page_alloc.c | 2 ++
mm/vmstat.c | 2 ++
2 files changed, 4 insertions(+)

--- a/mm/page_alloc.c~mm-show-watermark_boost-of-zone-in-zoneinfo
+++ a/mm/page_alloc.c
@@ -5993,6 +5993,7 @@ void show_free_areas(unsigned int filter
printk(KERN_CONT
"%s"
" free:%lukB"
+ " boost:%lukB"
" min:%lukB"
" low:%lukB"
" high:%lukB"
@@ -6013,6 +6014,7 @@ void show_free_areas(unsigned int filter
"\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)),
--- a/mm/vmstat.c~mm-show-watermark_boost-of-zone-in-zoneinfo
+++ a/mm/vmstat.c
@@ -1656,6 +1656,7 @@ static void zoneinfo_show_print(struct s
}
seq_printf(m,
"\n pages free %lu"
+ "\n boost %lu"
"\n min %lu"
"\n low %lu"
"\n high %lu"
@@ -1664,6 +1665,7 @@ static void zoneinfo_show_print(struct s
"\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),
_