The patch titled
Subject: mm: thp: make split queue lock safe when LRU pages are reparented
has been added to the -mm mm-unstable branch. Its filename is
mm-thp-make-split-queue-lock-safe-when-lru-pages-are-reparented.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-thp-make-split-queue-lock-safe-when-lru-pages-are-reparented.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: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Subject: mm: thp: make split queue lock safe when LRU pages are reparented
Date: Tue, 21 Jun 2022 20:56:53 +0800
Similar to the lruvec lock, we use the same approach to make the split
queue lock safe when LRU pages are reparented.
Link: https://lkml.kernel.org/r/20220621125658.64935-7-songmuchun@xxxxxxxxxxxxx
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Michal Koutný <mkoutny@xxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Waiman Long <longman@xxxxxxxxxx>
Cc: Xiongchun Duan <duanxiongchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 10 +++
mm/huge_memory.c | 116 +++++++++++++++++++++++++++--------
2 files changed, 100 insertions(+), 26 deletions(-)
--- a/include/linux/memcontrol.h~mm-thp-make-split-queue-lock-safe-when-lru-pages-are-reparented
+++ a/include/linux/memcontrol.h
@@ -1691,6 +1691,11 @@ int alloc_shrinker_info(struct mem_cgrou
void free_shrinker_info(struct mem_cgroup *memcg);
void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id);
void reparent_shrinker_deferred(struct mem_cgroup *memcg);
+
+static inline int shrinker_id(struct shrinker *shrinker)
+{
+ return shrinker->id;
+}
#else
#define mem_cgroup_sockets_enabled 0
static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
@@ -1704,6 +1709,11 @@ static inline void set_shrinker_bit(stru
int nid, int shrinker_id)
{
}
+
+static inline int shrinker_id(struct shrinker *shrinker)
+{
+ return -1;
+}
#endif
#ifdef CONFIG_MEMCG_KMEM
--- a/mm/huge_memory.c~mm-thp-make-split-queue-lock-safe-when-lru-pages-are-reparented
+++ a/mm/huge_memory.c
@@ -558,25 +558,90 @@ pmd_t maybe_pmd_mkwrite(pmd_t pmd, struc
}
#ifdef CONFIG_MEMCG
-static inline struct deferred_split *get_deferred_split_queue(struct page *page)
+static inline struct mem_cgroup *folio_split_queue_memcg(struct folio *folio,
+ struct deferred_split *queue)
{
- struct mem_cgroup *memcg = page_memcg(compound_head(page));
- struct pglist_data *pgdat = NODE_DATA(page_to_nid(page));
+ if (mem_cgroup_disabled())
+ return NULL;
+ if (&NODE_DATA(folio_nid(folio))->deferred_split_queue == queue)
+ return NULL;
+ return container_of(queue, struct mem_cgroup, deferred_split_queue);
+}
- if (memcg)
- return &memcg->deferred_split_queue;
- else
- return &pgdat->deferred_split_queue;
+static inline struct deferred_split *folio_memcg_split_queue(struct folio *folio)
+{
+ struct mem_cgroup *memcg = folio_memcg(folio);
+
+ return memcg ? &memcg->deferred_split_queue : NULL;
}
#else
-static inline struct deferred_split *get_deferred_split_queue(struct page *page)
+static inline struct mem_cgroup *folio_split_queue_memcg(struct folio *folio,
+ struct deferred_split *queue)
{
- struct pglist_data *pgdat = NODE_DATA(page_to_nid(page));
+ return NULL;
+}
- return &pgdat->deferred_split_queue;
+static inline struct deferred_split *folio_memcg_split_queue(struct folio *folio)
+{
+ return NULL;
}
#endif
+static struct deferred_split *folio_split_queue(struct folio *folio)
+{
+ struct deferred_split *queue = folio_memcg_split_queue(folio);
+
+ return queue ? : &NODE_DATA(folio_nid(folio))->deferred_split_queue;
+}
+
+static struct deferred_split *folio_split_queue_lock(struct folio *folio)
+{
+ struct deferred_split *queue;
+
+ rcu_read_lock();
+retry:
+ queue = folio_split_queue(folio);
+ spin_lock(&queue->split_queue_lock);
+
+ if (unlikely(folio_split_queue_memcg(folio, queue) != folio_memcg(folio))) {
+ spin_unlock(&queue->split_queue_lock);
+ goto retry;
+ }
+ rcu_read_unlock();
+
+ return queue;
+}
+
+static struct deferred_split *
+folio_split_queue_lock_irqsave(struct folio *folio, unsigned long *flags)
+{
+ struct deferred_split *queue;
+
+ rcu_read_lock();
+retry:
+ queue = folio_split_queue(folio);
+ spin_lock_irqsave(&queue->split_queue_lock, *flags);
+
+ if (unlikely(folio_split_queue_memcg(folio, queue) != folio_memcg(folio))) {
+ spin_unlock_irqrestore(&queue->split_queue_lock, *flags);
+ goto retry;
+ }
+ rcu_read_unlock();
+
+ return queue;
+}
+
+static inline void split_queue_unlock(struct deferred_split *queue)
+{
+ spin_unlock(&queue->split_queue_lock);
+}
+
+static inline void split_queue_unlock_irqrestore(struct deferred_split *queue,
+ unsigned long flags)
+{
+ spin_unlock_irqrestore(&queue->split_queue_lock, flags);
+}
+
void prep_transhuge_page(struct page *page)
{
/*
@@ -2600,7 +2665,7 @@ int split_huge_page_to_list(struct page
{
struct folio *folio = page_folio(page);
struct page *head = &folio->page;
- struct deferred_split *ds_queue = get_deferred_split_queue(head);
+ struct deferred_split *ds_queue;
XA_STATE(xas, &head->mapping->i_pages, head->index);
struct anon_vma *anon_vma = NULL;
struct address_space *mapping = NULL;
@@ -2692,13 +2757,13 @@ int split_huge_page_to_list(struct page
}
/* Prevent deferred_split_scan() touching ->_refcount */
- spin_lock(&ds_queue->split_queue_lock);
+ ds_queue = folio_split_queue_lock(folio);
if (page_ref_freeze(head, 1 + extra_pins)) {
if (!list_empty(page_deferred_list(head))) {
ds_queue->split_queue_len--;
list_del(page_deferred_list(head));
}
- spin_unlock(&ds_queue->split_queue_lock);
+ split_queue_unlock(ds_queue);
if (mapping) {
int nr = thp_nr_pages(head);
@@ -2716,7 +2781,7 @@ int split_huge_page_to_list(struct page
__split_huge_page(page, list, end);
ret = 0;
} else {
- spin_unlock(&ds_queue->split_queue_lock);
+ split_queue_unlock(ds_queue);
fail:
if (mapping)
xas_unlock(&xas);
@@ -2740,25 +2805,23 @@ out:
void free_transhuge_page(struct page *page)
{
- struct deferred_split *ds_queue = get_deferred_split_queue(page);
+ struct deferred_split *ds_queue;
unsigned long flags;
- spin_lock_irqsave(&ds_queue->split_queue_lock, flags);
+ ds_queue = folio_split_queue_lock_irqsave(page_folio(page), &flags);
if (!list_empty(page_deferred_list(page))) {
ds_queue->split_queue_len--;
list_del(page_deferred_list(page));
}
- spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags);
+ split_queue_unlock_irqrestore(ds_queue, flags);
free_compound_page(page);
}
void deferred_split_huge_page(struct page *page)
{
- struct deferred_split *ds_queue = get_deferred_split_queue(page);
-#ifdef CONFIG_MEMCG
- struct mem_cgroup *memcg = page_memcg(compound_head(page));
-#endif
+ struct deferred_split *ds_queue;
unsigned long flags;
+ struct folio *folio = page_folio(page);
VM_BUG_ON_PAGE(!PageTransHuge(page), page);
@@ -2775,18 +2838,19 @@ void deferred_split_huge_page(struct pag
if (PageSwapCache(page))
return;
- spin_lock_irqsave(&ds_queue->split_queue_lock, flags);
+ ds_queue = folio_split_queue_lock_irqsave(folio, &flags);
if (list_empty(page_deferred_list(page))) {
+ struct mem_cgroup *memcg;
+
+ memcg = folio_split_queue_memcg(folio, ds_queue);
count_vm_event(THP_DEFERRED_SPLIT_PAGE);
list_add_tail(page_deferred_list(page), &ds_queue->split_queue);
ds_queue->split_queue_len++;
-#ifdef CONFIG_MEMCG
if (memcg)
set_shrinker_bit(memcg, page_to_nid(page),
- deferred_split_shrinker.id);
-#endif
+ shrinker_id(&deferred_split_shrinker));
}
- spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags);
+ split_queue_unlock_irqrestore(ds_queue, flags);
}
static unsigned long deferred_split_count(struct shrinker *shrink,
_
Patches currently in -mm which might be from songmuchun@xxxxxxxxxxxxx are
mm-memory_hotplug-enumerate-all-supported-section-flags.patch
mm-memory_hotplug-make-hugetlb_optimize_vmemmap-compatible-with-memmap_on_memory.patch
mm-hugetlb-remove-minimum_order-variable.patch
mm-memcontrol-remove-dead-code-and-comments.patch
mm-rename-unlock_page_lruvec_irq-_irqrestore-to-lruvec_unlock_irq-_irqrestore.patch
mm-memcontrol-prepare-objcg-api-for-non-kmem-usage.patch
mm-memcontrol-make-lruvec-lock-safe-when-lru-pages-are-reparented.patch
mm-vmscan-rework-move_pages_to_lru.patch
mm-thp-make-split-queue-lock-safe-when-lru-pages-are-reparented.patch
mm-memcontrol-make-all-the-callers-of-foliopage_memcg-safe.patch
mm-memcontrol-introduce-memcg_reparent_ops.patch
mm-memcontrol-use-obj_cgroup-apis-to-charge-the-lru-pages.patch
mm-lru-add-vm_warn_on_once_folio-to-lru-maintenance-function.patch
mm-lru-use-lruvec-lock-to-serialize-memcg-changes.patch
