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

Commit Message

Andrew Morton Nov. 5, 2021, 8:40 p.m. UTC

From: Liangcai Fan <[e-mail]>
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/[e-mail]
Signed-off-by: Liangcai Fan <[e-mail]>
Cc: Chunyan Zhang <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

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

Patch

--- 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),