Re: [PATCH -v4 4/9] migrate_pages: split unmap_and_move() to _unmap() and _move()

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在 2023/2/6 下午2:33, Huang Ying 写道:
This is a preparation patch to batch the folio unmapping and moving.

In this patch, unmap_and_move() is split to migrate_folio_unmap() and
migrate_folio_move().  So, we can batch _unmap() and _move() in
different loops later.  To pass some information between unmap and
move, the original unused dst->mapping and dst->private are used.

Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Bharata B Rao <bharata@xxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: haoxin <xhao@xxxxxxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
---
  include/linux/migrate.h |   1 +
  mm/migrate.c            | 170 ++++++++++++++++++++++++++++++----------
  2 files changed, 130 insertions(+), 41 deletions(-)

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 3ef77f52a4f0..7376074f2e1e 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -18,6 +18,7 @@ struct migration_target_control;
   * - zero on page migration success;
   */
  #define MIGRATEPAGE_SUCCESS		0
+#define MIGRATEPAGE_UNMAP		1
/**
   * struct movable_operations - Driver page migration
diff --git a/mm/migrate.c b/mm/migrate.c
index 9a667039c34c..0428449149f4 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1009,11 +1009,53 @@ static int move_to_new_folio(struct folio *dst, struct folio *src,
  	return rc;
  }
-static int __unmap_and_move(struct folio *src, struct folio *dst,
+/*
+ * To record some information during migration, we uses
uses / use
  some unused
+ * fields (mapping and private) of struct folio of the newly allocated
+ * destination folio.  This is safe because nobody is using them
+ * except us.
+ */
+static void __migrate_folio_record(struct folio *dst,
+				   unsigned long page_was_mapped,
+				   struct anon_vma *anon_vma)
+{
+	dst->mapping = (void *)anon_vma;
+	dst->private = (void *)page_was_mapped;
+}
+
+static void __migrate_folio_extract(struct folio *dst,
+				   int *page_was_mappedp,
+				   struct anon_vma **anon_vmap)
+{
+	*anon_vmap = (void *)dst->mapping;
+	*page_was_mappedp = (unsigned long)dst->private;
+	dst->mapping = NULL;
+	dst->private = NULL;
+}
+
+/* Cleanup src folio upon migration success */
+static void migrate_folio_done(struct folio *src,
+			       enum migrate_reason reason)
+{
+	/*
+	 * Compaction can migrate also non-LRU pages which are
+	 * not accounted to NR_ISOLATED_*. They can be recognized
+	 * as __PageMovable
+	 */
+	if (likely(!__folio_test_movable(src)))
+		mod_node_page_state(folio_pgdat(src), NR_ISOLATED_ANON +
+				    folio_is_file_lru(src), -folio_nr_pages(src));
+
+	if (reason != MR_MEMORY_FAILURE)
+		/* We release the page in page_handle_poison. */
+		folio_put(src);
+}
+
+static int __migrate_folio_unmap(struct folio *src, struct folio *dst,
  				int force, enum migrate_mode mode)
  {
  	int rc = -EAGAIN;
-	bool page_was_mapped = false;
+	int page_was_mapped = 0;
  	struct anon_vma *anon_vma = NULL;
  	bool is_lru = !__PageMovable(&src->page);
@@ -1089,8 +1131,8 @@ static int __unmap_and_move(struct folio *src, struct folio *dst,
  		goto out_unlock;
if (unlikely(!is_lru)) {
-		rc = move_to_new_folio(dst, src, mode);
-		goto out_unlock_both;
+		__migrate_folio_record(dst, page_was_mapped, anon_vma);
+		return MIGRATEPAGE_UNMAP;
  	}
/*
@@ -1115,11 +1157,42 @@ static int __unmap_and_move(struct folio *src, struct folio *dst,
  		VM_BUG_ON_FOLIO(folio_test_anon(src) &&
  			       !folio_test_ksm(src) && !anon_vma, src);
  		try_to_migrate(src, 0);
-		page_was_mapped = true;
+		page_was_mapped = 1;
  	}
- if (!folio_mapped(src))
-		rc = move_to_new_folio(dst, src, mode);
+	if (!folio_mapped(src)) {
+		__migrate_folio_record(dst, page_was_mapped, anon_vma);
+		return MIGRATEPAGE_UNMAP;
+	}
+
+	if (page_was_mapped)
+		remove_migration_ptes(src, src, false);
+
+out_unlock_both:
+	folio_unlock(dst);
+out_unlock:
+	/* Drop an anon_vma reference if we took one */
+	if (anon_vma)
+		put_anon_vma(anon_vma);
+	folio_unlock(src);
+out:
+
+	return rc;
+}
+
+static int __migrate_folio_move(struct folio *src, struct folio *dst,
+				enum migrate_mode mode)
+{
+	int rc;
+	int page_was_mapped = 0;
+	struct anon_vma *anon_vma = NULL;
+	bool is_lru = !__PageMovable(&src->page);
+
+	__migrate_folio_extract(dst, &page_was_mapped, &anon_vma);
+
+	rc = move_to_new_folio(dst, src, mode);
+	if (unlikely(!is_lru))
+		goto out_unlock_both;
/*
  	 * When successful, push dst to LRU immediately: so that if it
@@ -1142,12 +1215,10 @@ static int __unmap_and_move(struct folio *src, struct folio *dst,
out_unlock_both:
  	folio_unlock(dst);
-out_unlock:
  	/* Drop an anon_vma reference if we took one */
  	if (anon_vma)
  		put_anon_vma(anon_vma);
  	folio_unlock(src);
-out:
  	/*
  	 * If migration is successful, decrease refcount of dst,
  	 * which will not free the page because new page owner increased
@@ -1159,19 +1230,15 @@ static int __unmap_and_move(struct folio *src, struct folio *dst,
  	return rc;
  }
-/*
- * Obtain the lock on folio, remove all ptes and migrate the folio
- * to the newly allocated folio in dst.
- */
-static int unmap_and_move(new_page_t get_new_page,
-				   free_page_t put_new_page,
-				   unsigned long private, struct folio *src,
-				   int force, enum migrate_mode mode,
-				   enum migrate_reason reason,
-				   struct list_head *ret)
+/* Obtain the lock on page, remove all ptes. */
+static int migrate_folio_unmap(new_page_t get_new_page, free_page_t put_new_page,
+			       unsigned long private, struct folio *src,
+			       struct folio **dstp, int force,
+			       enum migrate_mode mode, enum migrate_reason reason,
+			       struct list_head *ret)
  {
  	struct folio *dst;
-	int rc = MIGRATEPAGE_SUCCESS;
+	int rc = MIGRATEPAGE_UNMAP;
  	struct page *newpage = NULL;
if (!thp_migration_supported() && folio_test_transhuge(src))
@@ -1182,20 +1249,50 @@ static int unmap_and_move(new_page_t get_new_page,
  		folio_clear_active(src);
  		folio_clear_unevictable(src);
  		/* free_pages_prepare() will clear PG_isolated. */
-		goto out;
+		list_del(&src->lru);
+		migrate_folio_done(src, reason);
+		return MIGRATEPAGE_SUCCESS;
  	}
newpage = get_new_page(&src->page, private);
  	if (!newpage)
  		return -ENOMEM;
  	dst = page_folio(newpage);
+	*dstp = dst;
dst->private = NULL;
-	rc = __unmap_and_move(src, dst, force, mode);
+	rc = __migrate_folio_unmap(src, dst, force, mode);
+	if (rc == MIGRATEPAGE_UNMAP)
+		return rc;
+
+	/*
+	 * A page that has not been migrated will have kept its
+	 * references and be restored.
+	 */
+	/* restore the folio to right list. */
+	if (rc != -EAGAIN)
+		list_move_tail(&src->lru, ret);
+
+	if (put_new_page)
+		put_new_page(&dst->page, private);
+	else
+		folio_put(dst);
+
+	return rc;
+}
+
+/* Migrate the folio to the newly allocated folio in dst. */
+static int migrate_folio_move(free_page_t put_new_page, unsigned long private,
+			      struct folio *src, struct folio *dst,
+			      enum migrate_mode mode, enum migrate_reason reason,
+			      struct list_head *ret)
+{
+	int rc;
+
+	rc = __migrate_folio_move(src, dst, mode);
  	if (rc == MIGRATEPAGE_SUCCESS)
  		set_page_owner_migrate_reason(&dst->page, reason);
-out:
  	if (rc != -EAGAIN) {
  		/*
  		 * A folio that has been migrated has all references
@@ -1211,20 +1308,7 @@ static int unmap_and_move(new_page_t get_new_page,
  	 * we want to retry.
  	 */
  	if (rc == MIGRATEPAGE_SUCCESS) {
-		/*
-		 * Compaction can migrate also non-LRU folios which are
-		 * not accounted to NR_ISOLATED_*. They can be recognized
-		 * as __folio_test_movable
-		 */
-		if (likely(!__folio_test_movable(src)))
-			mod_node_page_state(folio_pgdat(src), NR_ISOLATED_ANON +
-					folio_is_file_lru(src), -folio_nr_pages(src));
-
-		if (reason != MR_MEMORY_FAILURE)
-			/*
-			 * We release the folio in page_handle_poison.
-			 */
-			folio_put(src);
+		migrate_folio_done(src, reason);
  	} else {
  		if (rc != -EAGAIN)
  			list_add_tail(&src->lru, ret);
@@ -1516,7 +1600,7 @@ static int migrate_pages_batch(struct list_head *from, new_page_t get_new_page,
  	int pass = 0;
  	bool is_large = false;
  	bool is_thp = false;
-	struct folio *folio, *folio2;
+	struct folio *folio, *folio2, *dst = NULL;
  	int rc, nr_pages;
  	LIST_HEAD(split_folios);
  	bool nosplit = (reason == MR_NUMA_MISPLACED);
@@ -1543,9 +1627,13 @@ static int migrate_pages_batch(struct list_head *from, new_page_t get_new_page,
cond_resched(); - rc = unmap_and_move(get_new_page, put_new_page,
-					    private, folio, pass > 2, mode,
-					    reason, ret_folios);
+			rc = migrate_folio_unmap(get_new_page, put_new_page, private,
+						 folio, &dst, pass > 2, mode,
+						 reason, ret_folios);
+			if (rc == MIGRATEPAGE_UNMAP)
+				rc = migrate_folio_move(put_new_page, private,
+							folio, dst, mode,
+							reason, ret_folios);
How to deal with the whole  pages are ummaped success,  but only part  pages are moved success ?
  			/*
  			 * The rules are:
  			 *	Success: folio will be freed




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