Commit a6ea8b5b authored Nov 05, 2021 by Liangcai Fan Committed by Linus Torvalds Nov 06, 2021

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 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>

parent 8ca1b5a4

mm/page_alloc.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -5993,6 +5993,7 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
		printk(KERN_CONT
		"%s"
		" free:%lukB"
		" boost:%lukB"
		" min:%lukB"
		" low:%lukB"
		" high:%lukB"
		@@ -6013,6 +6014,7 @@ 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)),

mm/vmstat.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1656,6 +1656,7 @@ 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"
		@@ -1664,6 +1665,7 @@ 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),