linux-kernel - [mm-stable PATCH] mm/vmstat: move pgdemote_* out of CONFIG_NUMA

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Date: Fri, 29 Dec 2023 10:26:51 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
	Li Zhijian <lizhijian@...itsu.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>
Subject: [mm-stable PATCH] mm/vmstat: move pgdemote_* out of CONFIG_NUMA_BALANCING

Demotion can work well without CONFIG_NUMA_BALANCING. But the
commit 23e9f0138963 ("mm/vmstat: move pgdemote_* to per-node stats")
wrongly hid it behind CONFIG_NUMA_BALANCING.

Fix it by moving them out of CONFIG_NUMA_BALANCING.

Fixes: 23e9f0138963 ("mm/vmstat: move pgdemote_* to per-node stats")
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
Cc: "Huang, Ying" <ying.huang@...el.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 include/linux/mmzone.h | 2 +-
 mm/vmscan.c            | 5 +----
 mm/vmstat.c            | 2 +-
 3 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 28665e1b8475..c18c53353b50 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -207,11 +207,11 @@ enum node_stat_item {
 #ifdef CONFIG_NUMA_BALANCING
 	PGPROMOTE_SUCCESS,	/* promote successfully */
 	PGPROMOTE_CANDIDATE,	/* candidate pages to promote */
+#endif
 	/* PGDEMOTE_*: pages demoted */
 	PGDEMOTE_KSWAPD,
 	PGDEMOTE_DIRECT,
 	PGDEMOTE_KHUGEPAGED,
-#endif
 	NR_VM_NODE_STAT_ITEMS
 };
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d3d401dcfaa4..12d302f67a54 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -409,12 +409,10 @@ void drop_slab(void)
 
 static int reclaimer_offset(void)
 {
-#ifdef CONFIG_NUMA_BALANCING
 	BUILD_BUG_ON(PGSTEAL_DIRECT - PGSTEAL_KSWAPD !=
 			PGDEMOTE_DIRECT - PGDEMOTE_KSWAPD);
 	BUILD_BUG_ON(PGSTEAL_KHUGEPAGED - PGSTEAL_KSWAPD !=
 			PGDEMOTE_KHUGEPAGED - PGDEMOTE_KSWAPD);
-#endif
 	BUILD_BUG_ON(PGSTEAL_DIRECT - PGSTEAL_KSWAPD !=
 			PGSCAN_DIRECT - PGSCAN_KSWAPD);
 	BUILD_BUG_ON(PGSTEAL_KHUGEPAGED - PGSTEAL_KSWAPD !=
@@ -978,10 +976,9 @@ static unsigned int demote_folio_list(struct list_head *demote_folios,
 	migrate_pages(demote_folios, alloc_demote_folio, NULL,
 		      (unsigned long)&mtc, MIGRATE_ASYNC, MR_DEMOTION,
 		      &nr_succeeded);
-#ifdef CONFIG_NUMA_BALANCING
+
 	mod_node_page_state(pgdat, PGDEMOTE_KSWAPD + reclaimer_offset(),
 			    nr_succeeded);
-#endif
 
 	return nr_succeeded;
 }
diff --git a/mm/vmstat.c b/mm/vmstat.c
index cfd8d8256f8e..1437ca2f28c5 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1248,10 +1248,10 @@ const char * const vmstat_text[] = {
 #ifdef CONFIG_NUMA_BALANCING
 	"pgpromote_success",
 	"pgpromote_candidate",
+#endif
 	"pgdemote_kswapd",
 	"pgdemote_direct",
 	"pgdemote_khugepaged",
-#endif
 
 	/* enum writeback_stat_item counters */
 	"nr_dirty_threshold",
-- 
2.29.2