linux-kernel - [PATCH v2 1/2] mm: Export the demote_page

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Date:   Wed, 22 Dec 2021 19:14:40 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     sj@...nel.org, akpm@...ux-foundation.org
Cc:     ying.huang@...el.com, dave.hansen@...ux.intel.com, ziy@...dia.com,
        shy828301@...il.com, zhongjiang-ali@...ux.alibaba.com,
        xlpang@...ux.alibaba.com, baolin.wang@...ux.alibaba.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] mm: Export the demote_page_list() function

Export the demote_page_list() function to the head file as a
preparation to support page demotion for DAMON monitor.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/internal.h | 2 ++
 mm/vmscan.c   | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index deb9bda..f11e444 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -181,6 +181,8 @@ static inline void set_page_refcounted(struct page *page)
 extern int isolate_lru_page(struct page *page);
 extern void putback_lru_page(struct page *page);
 extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason);
+extern unsigned int demote_page_list(struct list_head *demote_pages,
+				     struct pglist_data *pgdat);
 
 /*
  * in mm/rmap.c:
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f3162a5..849dffa 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1480,8 +1480,8 @@ static struct page *alloc_demote_page(struct page *page, unsigned long node)
  * another node.  Pages which are not demoted are left on
  * @demote_pages.
  */
-static unsigned int demote_page_list(struct list_head *demote_pages,
-				     struct pglist_data *pgdat)
+unsigned int demote_page_list(struct list_head *demote_pages,
+			      struct pglist_data *pgdat)
 {
 	int target_nid = next_demotion_node(pgdat->node_id);
 	unsigned int nr_succeeded;
-- 
1.8.3.1