The patch titled
Subject: migrate_pages: share more code between _unmap and _move
has been added to the -mm mm-unstable branch. Its filename is
migrate_pages-share-more-code-between-_unmap-and-_move.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/migrate_pages-share-more-code-between-_unmap-and-_move.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Huang Ying <ying.huang@xxxxxxxxx>
Subject: migrate_pages: share more code between _unmap and _move
Date: Tue, 27 Dec 2022 08:28:58 +0800
This is a code cleanup patch to reduce the duplicated code between the
_unmap and _move stages of migrate_pages(). No functionality change is
expected.
Link: https://lkml.kernel.org/r/20221227002859.27740-8-ying.huang@xxxxxxxxx
Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
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: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/migrate.c~migrate_pages-share-more-code-between-_unmap-and-_move
+++ a/mm/migrate.c
@@ -1047,21 +1047,26 @@ static void __migrate_folio_extract(stru
static void migrate_folio_undo_src(struct folio *src,
int page_was_mapped,
struct anon_vma *anon_vma,
+ bool locked,
struct list_head *ret)
{
if (page_was_mapped)
remove_migration_ptes(src, src, false);
if (anon_vma)
put_anon_vma(anon_vma);
- folio_unlock(src);
- list_move_tail(&src->lru, ret);
+ if (locked)
+ folio_unlock(src);
+ if (ret)
+ list_move_tail(&src->lru, ret);
}
static void migrate_folio_undo_dst(struct folio *dst,
+ bool locked,
free_page_t put_new_page,
unsigned long private)
{
- folio_unlock(dst);
+ if (locked)
+ folio_unlock(dst);
if (put_new_page)
put_new_page(&dst->page, private);
else
@@ -1085,14 +1090,44 @@ static void migrate_folio_done(struct fo
folio_put(src);
}
-static int __migrate_folio_unmap(struct folio *src, struct folio *dst,
- int force, bool force_lock, enum migrate_mode mode)
+/* 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, bool force_lock,
+ enum migrate_mode mode, enum migrate_reason reason,
+ struct list_head *ret)
{
- int rc = -EAGAIN;
+ struct folio *dst;
+ int rc = MIGRATEPAGE_UNMAP;
+ struct page *newpage = NULL;
int page_was_mapped = 0;
struct anon_vma *anon_vma = NULL;
bool is_lru = !__PageMovable(&src->page);
+ bool locked = false;
+ bool dst_locked = false;
+ if (!thp_migration_supported() && folio_test_transhuge(src))
+ return -ENOSYS;
+
+ if (folio_ref_count(src) == 1) {
+ /* Folio was freed from under us. So we are done. */
+ folio_clear_active(src);
+ folio_clear_unevictable(src);
+ /* free_pages_prepare() will clear PG_isolated. */
+ 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 = -EAGAIN;
if (!folio_trylock(src)) {
if (!force || mode == MIGRATE_ASYNC)
goto out;
@@ -1120,6 +1155,7 @@ static int __migrate_folio_unmap(struct
folio_lock(src);
}
+ locked = true;
if (folio_test_writeback(src)) {
/*
@@ -1134,10 +1170,10 @@ static int __migrate_folio_unmap(struct
break;
default:
rc = -EBUSY;
- goto out_unlock;
+ goto out;
}
if (!force)
- goto out_unlock;
+ goto out;
folio_wait_writeback(src);
}
@@ -1167,7 +1203,8 @@ static int __migrate_folio_unmap(struct
* This is much like races on refcount of oldpage: just don't BUG().
*/
if (unlikely(!folio_trylock(dst)))
- goto out_unlock;
+ goto out;
+ dst_locked = true;
if (unlikely(!is_lru)) {
__migrate_folio_record(dst, page_was_mapped, anon_vma);
@@ -1189,7 +1226,7 @@ static int __migrate_folio_unmap(struct
if (!src->mapping) {
if (folio_test_private(src)) {
try_to_free_buffers(src);
- goto out_unlock_both;
+ goto out;
}
} else if (folio_mapped(src)) {
/* Establish migration ptes */
@@ -1204,75 +1241,27 @@ static int __migrate_folio_unmap(struct
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;
-}
-
-/* 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, bool force_lock,
- enum migrate_mode mode, enum migrate_reason reason,
- struct list_head *ret)
-{
- struct folio *dst;
- int rc = MIGRATEPAGE_UNMAP;
- struct page *newpage = NULL;
-
- if (!thp_migration_supported() && folio_test_transhuge(src))
- return -ENOSYS;
-
- if (folio_ref_count(src) == 1) {
- /* Folio was freed from under us. So we are done. */
- folio_clear_active(src);
- folio_clear_unevictable(src);
- /* free_pages_prepare() will clear PG_isolated. */
- 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 = __migrate_folio_unmap(src, dst, force, force_lock, 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 && rc != -EDEADLOCK)
- list_move_tail(&src->lru, ret);
+ if (rc == -EAGAIN || rc == -EDEADLOCK)
+ ret = NULL;
- if (put_new_page)
- put_new_page(&dst->page, private);
- else
- folio_put(dst);
+ migrate_folio_undo_src(src, page_was_mapped, anon_vma, locked, ret);
+ if (dst)
+ migrate_folio_undo_dst(dst, dst_locked, put_new_page, private);
return rc;
}
-static int __migrate_folio_move(struct folio *src, struct folio *dst,
- enum migrate_mode mode)
+/* 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;
int page_was_mapped = 0;
@@ -1281,9 +1270,10 @@ static int __migrate_folio_move(struct f
__migrate_folio_extract(dst, &page_was_mapped, &anon_vma);
rc = move_to_new_folio(dst, src, mode);
+ if (rc)
+ goto out;
- if (rc != -EAGAIN)
- list_del(&dst->lru);
+ list_del(&dst->lru);
/*
* When successful, push dst to LRU immediately: so that if it
* turns out to be an mlocked page, remove_migration_ptes() will
@@ -1293,74 +1283,40 @@ static int __migrate_folio_move(struct f
* unsuccessful, and other cases when a page has been temporarily
* isolated from the unevictable LRU: but this case is the easiest.
*/
- if (rc == MIGRATEPAGE_SUCCESS) {
- folio_add_lru(dst);
- if (page_was_mapped)
- lru_add_drain();
- }
-
- if (rc == -EAGAIN) {
- __migrate_folio_record(dst, page_was_mapped, anon_vma);
- return rc;
- }
-
+ folio_add_lru(dst);
if (page_was_mapped)
- remove_migration_ptes(src,
- rc == MIGRATEPAGE_SUCCESS ? dst : src, false);
+ lru_add_drain();
+ if (page_was_mapped)
+ remove_migration_ptes(src, dst, false);
folio_unlock(dst);
- /* Drop an anon_vma reference if we took one */
- if (anon_vma)
- put_anon_vma(anon_vma);
- folio_unlock(src);
+ set_page_owner_migrate_reason(&dst->page, reason);
/*
* If migration is successful, decrease refcount of dst,
* which will not free the page because new page owner increased
* refcounter.
*/
- if (rc == MIGRATEPAGE_SUCCESS)
- 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);
-
- if (rc != -EAGAIN) {
- /*
- * A folio that has been migrated has all references
- * removed and will be freed. A folio that has not been
- * migrated will have kept its references and be restored.
- */
- list_del(&src->lru);
- }
+ folio_put(dst);
/*
- * If migration is successful, releases reference grabbed during
- * isolation. Otherwise, restore the folio to right list unless
- * we want to retry.
+ * A page that has been migrated has all references removed
+ * and will be freed.
*/
- if (rc == MIGRATEPAGE_SUCCESS) {
- migrate_folio_done(src, reason);
- } else if (rc != -EAGAIN) {
- list_add_tail(&src->lru, ret);
+ list_del(&src->lru);
+ migrate_folio_undo_src(src, 0, anon_vma, true, NULL);
+ migrate_folio_done(src, reason);
- if (put_new_page)
- put_new_page(&dst->page, private);
- else
- folio_put(dst);
+ return rc;
+out:
+ if (rc == -EAGAIN) {
+ __migrate_folio_record(dst, page_was_mapped, anon_vma);
+ return rc;
}
+ migrate_folio_undo_src(src, page_was_mapped, anon_vma, true, ret);
+ list_del(&dst->lru);
+ migrate_folio_undo_dst(dst, true, put_new_page, private);
+
return rc;
}
@@ -1866,9 +1822,9 @@ out:
__migrate_folio_extract(dst, &page_was_mapped, &anon_vma);
migrate_folio_undo_src(folio, page_was_mapped, anon_vma,
- ret_folios);
+ true, ret_folios);
list_del(&dst->lru);
- migrate_folio_undo_dst(dst, put_new_page, private);
+ migrate_folio_undo_dst(dst, true, put_new_page, private);
dst = dst2;
dst2 = list_next_entry(dst, lru);
}
_
Patches currently in -mm which might be from ying.huang@xxxxxxxxx are
migrate_pages-organize-stats-with-struct-migrate_pages_stats.patch
migrate_pages-separate-hugetlb-folios-migration.patch
migrate_pages-restrict-number-of-pages-to-migrate-in-batch.patch
migrate_pages-split-unmap_and_move-to-_unmap-and-_move.patch
migrate_pages-batch-_unmap-and-_move.patch
migrate_pages-move-migrate_folio_done-and-migrate_folio_unmap.patch
migrate_pages-share-more-code-between-_unmap-and-_move.patch
migrate_pages-batch-flushing-tlb.patch
