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Message-ID: <20240803094715.23900-2-gourry@gourry.net>
Date: Sat, 3 Aug 2024 05:47:13 -0400
From: Gregory Price <gourry@...rry.net>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
akpm@...ux-foundation.org,
david@...hat.com,
ying.huang@...el.com,
nphamcs@...il.com,
nehagholkar@...a.com,
abhishekd@...a.com,
Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH 1/3] migrate: Allow migrate_misplaced_folio APIs without a VMA
To migrate unmapped pagecache folios, migrate_misplaced_folio and
migrate_misplaced_folio_prepare must handle folios without VMAs.
migrate_misplaced_folio_prepare checks VMA for exec bits, so allow
a NULL VMA when it does not have a mapping. migrate_misplaced_folio
does not require a VMA, remove it from the argument list.
Suggested-by: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Gregory Price <gourry@...rry.net>
---
include/linux/migrate.h | 6 ++----
mm/huge_memory.c | 2 +-
mm/memory.c | 2 +-
mm/migrate.c | 7 +++----
4 files changed, 7 insertions(+), 10 deletions(-)
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 644be30b69c8..553bdb4a65db 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -141,16 +141,14 @@ const struct movable_operations *page_movable_ops(struct page *page)
#ifdef CONFIG_NUMA_BALANCING
int migrate_misplaced_folio_prepare(struct folio *folio,
struct vm_area_struct *vma, int node);
-int migrate_misplaced_folio(struct folio *folio, struct vm_area_struct *vma,
- int node);
+int migrate_misplaced_folio(struct folio *folio, int node);
#else
static inline int migrate_misplaced_folio_prepare(struct folio *folio,
struct vm_area_struct *vma, int node)
{
return -EAGAIN; /* can't migrate now */
}
-static inline int migrate_misplaced_folio(struct folio *folio,
- struct vm_area_struct *vma, int node)
+static inline int migrate_misplaced_folio(struct folio *folio, int node)
{
return -EAGAIN; /* can't migrate now */
}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f4be468e06a4..f79c42e36d37 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1725,7 +1725,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
spin_unlock(vmf->ptl);
writable = false;
- if (!migrate_misplaced_folio(folio, vma, target_nid)) {
+ if (!migrate_misplaced_folio(folio, target_nid)) {
flags |= TNF_MIGRATED;
nid = target_nid;
} else {
diff --git a/mm/memory.c b/mm/memory.c
index 34f8402d2046..1d97bdfd0ed6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5355,7 +5355,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
ignore_writable = true;
/* Migrate to the requested node */
- if (!migrate_misplaced_folio(folio, vma, target_nid)) {
+ if (!migrate_misplaced_folio(folio, target_nid)) {
nid = target_nid;
flags |= TNF_MIGRATED;
} else {
diff --git a/mm/migrate.c b/mm/migrate.c
index e7296c0fb5d5..c648dc08758b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2546,7 +2546,7 @@ static struct folio *alloc_misplaced_dst_folio(struct folio *src,
/*
* Prepare for calling migrate_misplaced_folio() by isolating the folio if
- * permitted. Must be called with the PTL still held.
+ * permitted. If VMA is not NULL, Must be called with the PTL still held.
*/
int migrate_misplaced_folio_prepare(struct folio *folio,
struct vm_area_struct *vma, int node)
@@ -2563,7 +2563,7 @@ int migrate_misplaced_folio_prepare(struct folio *folio,
* See folio_likely_mapped_shared() on possible imprecision
* when we cannot easily detect if a folio is shared.
*/
- if ((vma->vm_flags & VM_EXEC) &&
+ if (vma && (vma->vm_flags & VM_EXEC) &&
folio_likely_mapped_shared(folio))
return -EACCES;
@@ -2614,8 +2614,7 @@ int migrate_misplaced_folio_prepare(struct folio *folio,
* elevated reference count on the folio. This function will un-isolate the
* folio, dereferencing the folio before returning.
*/
-int migrate_misplaced_folio(struct folio *folio, struct vm_area_struct *vma,
- int node)
+int migrate_misplaced_folio(struct folio *folio, int node)
{
pg_data_t *pgdat = NODE_DATA(node);
int nr_remaining;
--
2.43.0
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