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mm/page_alloc.c: show watermark_boost of zone in zoneinfo

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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>
This commit is contained in:
Liangcai Fan 2021-11-05 13:40:37 -07:00 • committed by Linus Torvalds
parent 8ca1b5a498
commit a6ea8b5b9f
2 changed files with 4 additions and 0 deletions
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2
mm/page_alloc.c
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@ -5993,6 +5993,7 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
printk(KERN_CONT printk(KERN_CONT
"%s" "%s"
" free:%lukB" " free:%lukB"
" boost:%lukB"
" min:%lukB" " min:%lukB"
" low:%lukB" " low:%lukB"
" high:%lukB" " high:%lukB"
@ -6013,6 +6014,7 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
"\n", "\n",
zone->name, zone->name,
K(zone_page_state(zone, NR_FREE_PAGES)), K(zone_page_state(zone, NR_FREE_PAGES)),
K(zone->watermark_boost),
K(min_wmark_pages(zone)), K(min_wmark_pages(zone)),
K(low_wmark_pages(zone)), K(low_wmark_pages(zone)),
K(high_wmark_pages(zone)), K(high_wmark_pages(zone)),

2
mm/vmstat.c
View file

@ -1656,6 +1656,7 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
} }
seq_printf(m, seq_printf(m,
"\n pages free %lu" "\n pages free %lu"
"\n boost %lu"
"\n min %lu" "\n min %lu"
"\n low %lu" "\n low %lu"
"\n high %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 managed %lu"
"\n cma %lu", "\n cma %lu",
zone_page_state(zone, NR_FREE_PAGES), zone_page_state(zone, NR_FREE_PAGES),
zone->watermark_boost,
min_wmark_pages(zone), min_wmark_pages(zone),
low_wmark_pages(zone), low_wmark_pages(zone),
high_wmark_pages(zone), high_wmark_pages(zone),