From 668e4147d8850df32ca41e28f52c146025ca45c6 Mon Sep 17 00:00:00 2001 From: Yang Shi Date: Thu, 2 Sep 2021 14:59:19 -0700 Subject: mm/vmscan: add page demotion counter Account the number of demoted pages. 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() ] Link: https://lkml.kernel.org/r/20210721063926.3024591-5-ying.huang@intel.com Link: https://lkml.kernel.org/r/20210715055145.195411-6-ying.huang@intel.com Signed-off-by: Yang Shi Signed-off-by: Dave Hansen Signed-off-by: "Huang, Ying" Reviewed-by: Yang Shi Reviewed-by: Wei Xu Reviewed-by: Zi Yan Cc: Michal Hocko Cc: David Rientjes Cc: Dan Williams Cc: David Hildenbrand Cc: Oscar Salvador Cc: Greg Thelen Cc: Keith Busch Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmscan.c | 5 +++++ mm/vmstat.c | 2 ++ 2 files changed, 7 insertions(+) (limited to 'mm') diff --git a/mm/vmscan.c b/mm/vmscan.c index f26b247f5daf..88593b82a8df 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1318,6 +1318,11 @@ static unsigned int demote_page_list(struct list_head *demote_pages, 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 --git a/mm/vmstat.c b/mm/vmstat.c index b0534e068166..ec5a2e789dd2 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1217,6 +1217,8 @@ const char * const vmstat_text[] = { "pgreuse", "pgsteal_kswapd", "pgsteal_direct", + "pgdemote_kswapd", + "pgdemote_direct", "pgscan_kswapd", "pgscan_direct", "pgscan_direct_throttle", -- cgit v1.2.3-58-ga151