Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: ZHwIsZBuW+7c8xUWOFWEYRUp57nPh/jvUyMlEhOtJlphz/lT2HiXG2BIKOctqehuFfvMcCF8xW
 +5t6ZBYGaubA==
IronPort-SDR: IUjkEwm0XElNDp6FrclSjaclAFLl32enZKn+q4lFKRahTklE3wGaTOj+hfzFKzAcun2pHt+Kis
 2USYtyIb90gQ==
From:   Huang Ying <ying.huang@intel.com>
To:     linux-mm@kvack.org
Cc:     linux-kernel@vger.kernel.org,
        Yang Shi <yang.shi@linux.alibaba.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "Huang, Ying" <ying.huang@intel.com>,
        Yang Shi <shy828301@gmail.com>, Michal Hocko <mhocko@suse.com>,
        Wei Xu <weixugc@google.com>,
        David Rientjes <rientjes@google.com>,
        Dan Williams <dan.j.williams@intel.com>,
        David Hildenbrand <david@redhat.com>,
        osalvador <osalvador@suse.de>
Subject: [PATCH -V8 06/10] mm/vmscan: add page demotion counter
Date:   Fri, 18 Jun 2021 14:15:33 +0800
Message-Id: <20210618061537.434999-7-ying.huang@intel.com>
In-Reply-To: <20210618061537.434999-1-ying.huang@intel.com>
References: <20210618061537.434999-1-ying.huang@intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Yang Shi <yang.shi@linux.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@linux.alibaba.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Wei Xu <weixugc@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: osalvador <osalvador@suse.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 ddda32031f0c..7d5c7216a4b7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1317,6 +1317,11 @@ 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