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Message-ID: <20250618174014.1168640-22-david@redhat.com>
Date: Wed, 18 Jun 2025 19:40:04 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
linux-doc@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
virtualization@...ts.linux.dev,
linux-fsdevel@...r.kernel.org,
David Hildenbrand <david@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Jerrin Shaji George <jerrin.shaji-george@...adcom.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Eugenio Pérez <eperezma@...hat.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Jan Kara <jack@...e.cz>,
Zi Yan <ziy@...dia.com>,
Matthew Brost <matthew.brost@...el.com>,
Joshua Hahn <joshua.hahnjy@...il.com>,
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"Liam R. Howlett" <Liam.Howlett@...cle.com>,
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Harry Yoo <harry.yoo@...cle.com>,
Qi Zheng <zhengqi.arch@...edance.com>,
Shakeel Butt <shakeel.butt@...ux.dev>
Subject: [PATCH RFC 21/29] mm: rename PG_isolated to PG_movable_ops_isolated
Let's rename the flag to make it clearer where it applies (not folios
...).
While at it, define the flag only with CONFIG_MIGRATION.
Signed-off-by: David Hildenbrand <david@...hat.com>
---
include/linux/page-flags.h | 16 +++++++++++-----
mm/compaction.c | 2 +-
mm/migrate.c | 14 +++++++-------
3 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 016a6e6fa428a..aa48b05536bca 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -167,10 +167,9 @@ enum pageflags {
/* Remapped by swiotlb-xen. */
PG_xen_remapped = PG_owner_priv_1,
- /* non-lru isolated movable page */
- PG_isolated = PG_reclaim,
-
#ifdef CONFIG_MIGRATION
+ /* movable_ops page that is isolated for migration */
+ PG_movable_ops_isolated = PG_reclaim,
/* this is a movable_ops page (for selected typed pages only) */
PG_movable_ops = PG_uptodate,
#endif
@@ -1126,8 +1125,6 @@ static inline bool folio_contain_hwpoisoned_page(struct folio *folio)
bool is_free_buddy_page(const struct page *page);
-PAGEFLAG(Isolated, isolated, PF_ANY);
-
#ifdef CONFIG_MIGRATION
/*
* This page is migratable through movable_ops (for selected typed pages
@@ -1146,8 +1143,17 @@ PAGEFLAG(Isolated, isolated, PF_ANY);
* page_has_movable_ops() instead.
*/
PAGEFLAG(MovableOps, movable_ops, PF_NO_TAIL);
+/*
+ * A movable_ops page has this flag set while it is isolated for migration.
+ * This flag primarily protects against concurrent migration attempts.
+ *
+ * Once migration ended (success or failure), the flag is cleared. The
+ * flag is managed by the migration core.
+ */
+PAGEFLAG(MovableOpsIsolated, movable_ops_isolated, PF_NO_TAIL);
#else
PAGEFLAG_FALSE(MovableOps, movable_ops);
+PAGEFLAG_FALSE(MovableOpsIsolated, movable_ops_isolated);
#endif
/**
diff --git a/mm/compaction.c b/mm/compaction.c
index 86d671a520e91..809e4395cadfc 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1051,7 +1051,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
if (!PageLRU(page)) {
/* Isolation will grab the page lock. */
if (unlikely(page_has_movable_ops(page)) &&
- !PageIsolated(page)) {
+ !PageMovableOpsIsolated(page)) {
if (locked) {
unlock_page_lruvec_irqrestore(locked, flags);
locked = NULL;
diff --git a/mm/migrate.c b/mm/migrate.c
index a36030de94f30..f87a998b696e2 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -135,7 +135,7 @@ bool isolate_movable_ops_page(struct page *page, isolate_mode_t mode)
goto out_putfolio;
VM_WARN_ON_ONCE_PAGE(!page_has_movable_ops(page), page);
- if (PageIsolated(page))
+ if (PageMovableOpsIsolated(page))
goto out_no_isolated;
mops = page_movable_ops(page);
@@ -146,8 +146,8 @@ bool isolate_movable_ops_page(struct page *page, isolate_mode_t mode)
goto out_no_isolated;
/* Driver shouldn't use the isolated flag */
- VM_WARN_ON_ONCE_PAGE(PageIsolated(page), page);
- SetPageIsolated(page);
+ VM_WARN_ON_ONCE_PAGE(PageMovableOpsIsolated(page), page);
+ SetPageMovableOpsIsolated(page);
folio_unlock(folio);
return true;
@@ -177,10 +177,10 @@ static void putback_movable_ops_page(struct page *page)
struct folio *folio = page_folio(page);
VM_WARN_ON_ONCE_PAGE(!page_has_movable_ops(page), page);
- VM_WARN_ON_ONCE_PAGE(!PageIsolated(page), page);
+ VM_WARN_ON_ONCE_PAGE(!PageMovableOpsIsolated(page), page);
folio_lock(folio);
page_movable_ops(page)->putback_page(page);
- ClearPageIsolated(page);
+ ClearPageMovableOpsIsolated(page);
folio_unlock(folio);
folio_put(folio);
}
@@ -216,10 +216,10 @@ static int migrate_movable_ops_page(struct page *dst, struct page *src,
int rc = MIGRATEPAGE_SUCCESS;
VM_WARN_ON_ONCE_PAGE(!page_has_movable_ops(src), src);
- VM_WARN_ON_ONCE_PAGE(!PageIsolated(src), src);
+ VM_WARN_ON_ONCE_PAGE(!PageMovableOpsIsolated(src), src);
rc = page_movable_ops(src)->migrate_page(dst, src, mode);
if (rc == MIGRATEPAGE_SUCCESS)
- ClearPageIsolated(src);
+ ClearPageMovableOpsIsolated(src);
return rc;
}
--
2.49.0
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