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From: Byungchul Park <byungchul@sk.com>
To: linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Cc: kernel_team@skhynix.com,
	akpm@linux-foundation.org,
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Subject: [PATCH v11 07/12] mm: add a parameter, unmap generation number, to free_unref_folios()
Date: Fri, 31 May 2024 18:19:56 +0900
Message-Id: <20240531092001.30428-8-byungchul@sk.com>
In-Reply-To: <20240531092001.30428-1-byungchul@sk.com>
References: <20240531092001.30428-1-byungchul@sk.com>
Precedence: bulk

Unmap generation number is used by luf mechanism to track need of tlb
flush for each page residing in pcp or buddy.

The number should be delivered to pcp or buddy via free_unref_folios()
that is for releasing folios that have been unmapped during reclaim in
shrink_folio_list().

Signed-off-by: Byungchul Park <byungchul@sk.com>
---
 mm/internal.h   |  2 +-
 mm/page_alloc.c | 10 +++++-----
 mm/swap.c       |  6 +++---
 mm/vmscan.c     |  8 ++++----
 4 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index 380ae980e4f9..dba6d0eb7b6d 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -662,7 +662,7 @@ extern bool free_pages_prepare(struct page *page, unsigned int order);
 extern int user_min_free_kbytes;
 
 void free_unref_page(struct page *page, unsigned int order, unsigned short int ugen);
-void free_unref_folios(struct folio_batch *fbatch);
+void free_unref_folios(struct folio_batch *fbatch, unsigned short int ugen);
 
 extern void zone_pcp_reset(struct zone *zone);
 extern void zone_pcp_disable(struct zone *zone);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6fbbe45be5ae..c9acb4da91e0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2698,7 +2698,7 @@ void free_unref_page(struct page *page, unsigned int order,
 /*
  * Free a batch of folios
  */
-void free_unref_folios(struct folio_batch *folios)
+void free_unref_folios(struct folio_batch *folios, unsigned short int ugen)
 {
 	unsigned long __maybe_unused UP_flags;
 	struct per_cpu_pages *pcp = NULL;
@@ -2720,7 +2720,7 @@ void free_unref_folios(struct folio_batch *folios)
 		 */
 		if (!pcp_allowed_order(order)) {
 			free_one_page(folio_zone(folio), &folio->page,
-				      pfn, order, FPI_NONE, 0);
+				      pfn, order, FPI_NONE, ugen);
 			continue;
 		}
 		folio->private = (void *)(unsigned long)order;
@@ -2756,7 +2756,7 @@ void free_unref_folios(struct folio_batch *folios)
 			 */
 			if (is_migrate_isolate(migratetype)) {
 				free_one_page(zone, &folio->page, pfn,
-					      order, FPI_NONE, 0);
+					      order, FPI_NONE, ugen);
 				continue;
 			}
 
@@ -2769,7 +2769,7 @@ void free_unref_folios(struct folio_batch *folios)
 			if (unlikely(!pcp)) {
 				pcp_trylock_finish(UP_flags);
 				free_one_page(zone, &folio->page, pfn,
-					      order, FPI_NONE, 0);
+					      order, FPI_NONE, ugen);
 				continue;
 			}
 			locked_zone = zone;
@@ -2784,7 +2784,7 @@ void free_unref_folios(struct folio_batch *folios)
 
 		trace_mm_page_free_batched(&folio->page);
 		free_unref_page_commit(zone, pcp, &folio->page, migratetype,
-				order, 0);
+				order, ugen);
 	}
 
 	if (pcp) {
diff --git a/mm/swap.c b/mm/swap.c
index dae169b19ab9..67605bbfc95c 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -161,11 +161,11 @@ void put_pages_list(struct list_head *pages)
 		/* LRU flag must be clear because it's passed using the lru */
 		if (folio_batch_add(&fbatch, folio) > 0)
 			continue;
-		free_unref_folios(&fbatch);
+		free_unref_folios(&fbatch, 0);
 	}
 
 	if (fbatch.nr)
-		free_unref_folios(&fbatch);
+		free_unref_folios(&fbatch, 0);
 	INIT_LIST_HEAD(pages);
 }
 EXPORT_SYMBOL(put_pages_list);
@@ -1027,7 +1027,7 @@ void folios_put_refs(struct folio_batch *folios, unsigned int *refs)
 
 	folios->nr = j;
 	mem_cgroup_uncharge_folios(folios);
-	free_unref_folios(folios);
+	free_unref_folios(folios, 0);
 }
 EXPORT_SYMBOL(folios_put_refs);
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b9170f767353..15efe6f0edce 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1461,7 +1461,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
 		if (folio_batch_add(&free_folios, folio) == 0) {
 			mem_cgroup_uncharge_folios(&free_folios);
 			try_to_unmap_flush();
-			free_unref_folios(&free_folios);
+			free_unref_folios(&free_folios, 0);
 		}
 		continue;
 
@@ -1528,7 +1528,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
 
 	mem_cgroup_uncharge_folios(&free_folios);
 	try_to_unmap_flush();
-	free_unref_folios(&free_folios);
+	free_unref_folios(&free_folios, 0);
 
 	list_splice(&ret_folios, folio_list);
 	count_vm_events(PGACTIVATE, pgactivate);
@@ -1868,7 +1868,7 @@ static unsigned int move_folios_to_lru(struct lruvec *lruvec,
 			if (folio_batch_add(&free_folios, folio) == 0) {
 				spin_unlock_irq(&lruvec->lru_lock);
 				mem_cgroup_uncharge_folios(&free_folios);
-				free_unref_folios(&free_folios);
+				free_unref_folios(&free_folios, 0);
 				spin_lock_irq(&lruvec->lru_lock);
 			}
 
@@ -1890,7 +1890,7 @@ static unsigned int move_folios_to_lru(struct lruvec *lruvec,
 	if (free_folios.nr) {
 		spin_unlock_irq(&lruvec->lru_lock);
 		mem_cgroup_uncharge_folios(&free_folios);
-		free_unref_folios(&free_folios);
+		free_unref_folios(&free_folios, 0);
 		spin_lock_irq(&lruvec->lru_lock);
 	}
 
-- 
2.17.1