* [PATCH] mm: Show watermark_boost of zone in zoneinfo
@ 2021-09-24 8:36 Liangcai Fan
0 siblings, 0 replies; only message in thread
From: Liangcai Fan @ 2021-09-24 8:36 UTC (permalink / raw)
To: liangcai.fan, akpm; +Cc: linux-kernel, linux-mm, zhang.lyra, Liangcai Fan
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.
Signed-off-by: Liangcai Fan <liangcaifan19@gmail.com>
---
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 b37435c..fe343ad 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5980,6 +5980,7 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
printk(KERN_CONT
"%s"
" free:%lukB"
+ " boost:%lukB"
" min:%lukB"
" low:%lukB"
" high:%lukB"
@@ -6000,6 +6001,7 @@ 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 8ce2620..dbe37ed 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -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),
--
1.9.1
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