From: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Account the number of demoted pages into reclaim_state->nr_demoted.
Add pgdemote_kswapd and pgdemote_direct VM counters showed in
/proc/vmstat.
[ daveh:
- __count_vm_events() a bit, and made them look at the THP
size directly rather than getting data from migrate_pages()
]
Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: osalvador <osalvador@xxxxxxx>
--
Changes since 202010:
* remove unused scan-control 'demoted' field
---
b/include/linux/vm_event_item.h | 2 ++
b/mm/vmscan.c | 5 +++++
b/mm/vmstat.c | 2 ++
3 files changed, 9 insertions(+)
diff -puN include/linux/vm_event_item.h~mm-vmscan-add-page-demotion-counter include/linux/vm_event_item.h
--- a/include/linux/vm_event_item.h~mm-vmscan-add-page-demotion-counter 2021-03-04 15:35:57.698806425 -0800
+++ b/include/linux/vm_event_item.h 2021-03-04 15:35:57.719806425 -0800
@@ -33,6 +33,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
PGREUSE,
PGSTEAL_KSWAPD,
PGSTEAL_DIRECT,
+ PGDEMOTE_KSWAPD,
+ PGDEMOTE_DIRECT,
PGSCAN_KSWAPD,
PGSCAN_DIRECT,
PGSCAN_DIRECT_THROTTLE,
diff -puN mm/vmscan.c~mm-vmscan-add-page-demotion-counter mm/vmscan.c
--- a/mm/vmscan.c~mm-vmscan-add-page-demotion-counter 2021-03-04 15:35:57.700806425 -0800
+++ b/mm/vmscan.c 2021-03-04 15:35:57.724806425 -0800
@@ -1118,6 +1118,11 @@ static unsigned int demote_page_list(str
target_nid, MIGRATE_ASYNC, MR_DEMOTION,
&nr_succeeded);
+ if (current_is_kswapd())
+ __count_vm_events(PGDEMOTE_KSWAPD, nr_succeeded);
+ else
+ __count_vm_events(PGDEMOTE_DIRECT, nr_succeeded);
+
return nr_succeeded;
}
diff -puN mm/vmstat.c~mm-vmscan-add-page-demotion-counter mm/vmstat.c
--- a/mm/vmstat.c~mm-vmscan-add-page-demotion-counter 2021-03-04 15:35:57.708806425 -0800
+++ b/mm/vmstat.c 2021-03-04 15:35:57.726806425 -0800
@@ -1244,6 +1244,8 @@ const char * const vmstat_text[] = {
"pgreuse",
"pgsteal_kswapd",
"pgsteal_direct",
+ "pgdemote_kswapd",
+ "pgdemote_direct",
"pgscan_kswapd",
"pgscan_direct",
"pgscan_direct_throttle",
_
