linux-kernel - [PATCH -V9 5/9] mm/vmscan: add page demotion counter

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Message-Id: <20210625073204.1005986-6-ying.huang@intel.com>
Date:   Fri, 25 Jun 2021 15:32:00 +0800
From:   Huang Ying <ying.huang@...el.com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Yang Shi <shy828301@...il.com>, Wei Xu <weixugc@...gle.com>,
        Michal Hocko <mhocko@...e.com>, Zi Yan <ziy@...dia.com>,
        David Rientjes <rientjes@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        osalvador <osalvador@...e.de>
Subject: [PATCH -V9 5/9] mm/vmscan: add page demotion counter

From: Yang Shi <yang.shi@...ux.alibaba.com>

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()
]

Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>
Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
Reviewed-by: Yang Shi <shy828301@...il.com>
Reviewed-by: Wei Xu <weixugc@...gle.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Zi Yan <ziy@...dia.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: osalvador <osalvador@...e.de>

--

Changes since 202010:
 * remove unused scan-control 'demoted' field
---
 include/linux/vm_event_item.h | 2 ++
 mm/vmscan.c                   | 5 +++++
 mm/vmstat.c                   | 2 ++
 3 files changed, 9 insertions(+)

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index ae0dd1948c2b..a185cc75ff52 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -33,6 +33,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 		PGREUSE,
 		PGSTEAL_KSWAPD,
 		PGSTEAL_DIRECT,
+		PGDEMOTE_KSWAPD,
+		PGDEMOTE_DIRECT,
 		PGSCAN_KSWAPD,
 		PGSCAN_DIRECT,
 		PGSCAN_DIRECT_THROTTLE,
diff --git a/mm/vmscan.c b/mm/vmscan.c
index badaf3d4360d..78b3bae71520 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1326,6 +1326,11 @@ 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 cccee36b289c..a51fbdcadff5 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1259,6 +1259,8 @@ const char * const vmstat_text[] = {
 	"pgreuse",
 	"pgsteal_kswapd",
 	"pgsteal_direct",
+	"pgdemote_kswapd",
+	"pgdemote_direct",
 	"pgscan_kswapd",
 	"pgscan_direct",
 	"pgscan_direct_throttle",
-- 
2.30.2