Merge tag 'mm-stable-2023-02-20-13-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - Daniel Verkamp has contributed a memfd series ("mm/memfd: add
   F_SEAL_EXEC") which permits the setting of the memfd execute bit at
   memfd creation time, with the option of sealing the state of the X
   bit.

 - Peter Xu adds a patch series ("mm/hugetlb: Make huge_pte_offset()
   thread-safe for pmd unshare") which addresses a rare race condition
   related to PMD unsharing.

 - Several folioification patch serieses from Matthew Wilcox, Vishal
   Moola, Sidhartha Kumar and Lorenzo Stoakes

 - Johannes Weiner has a series ("mm: push down lock_page_memcg()")
   which does perform some memcg maintenance and cleanup work.

 - SeongJae Park has added DAMOS filtering to DAMON, with the series
   "mm/damon/core: implement damos filter".

   These filters provide users with finer-grained control over DAMOS's
   actions. SeongJae has also done some DAMON cleanup work.

 - Kairui Song adds a series ("Clean up and fixes for swap").

 - Vernon Yang contributed the series "Clean up and refinement for maple
   tree".

 - Yu Zhao has contributed the "mm: multi-gen LRU: memcg LRU" series. It
   adds to MGLRU an LRU of memcgs, to improve the scalability of global
   reclaim.

 - David Hildenbrand has added some userfaultfd cleanup work in the
   series "mm: uffd-wp + change_protection() cleanups".

 - Christoph Hellwig has removed the generic_writepages() library
   function in the series "remove generic_writepages".

 - Baolin Wang has performed some maintenance on the compaction code in
   his series "Some small improvements for compaction".

 - Sidhartha Kumar is doing some maintenance work on struct page in his
   series "Get rid of tail page fields".

 - David Hildenbrand contributed some cleanup, bugfixing and
   generalization of pte management and of pte debugging in his series
   "mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on all architectures with
   swap PTEs".

 - Mel Gorman and Neil Brown have removed the __GFP_ATOMIC allocation
   flag in the series "Discard __GFP_ATOMIC".

 - Sergey Senozhatsky has improved zsmalloc's memory utilization with
   his series "zsmalloc: make zspage chain size configurable".

 - Joey Gouly has added prctl() support for prohibiting the creation of
   writeable+executable mappings.

   The previous BPF-based approach had shortcomings. See "mm: In-kernel
   support for memory-deny-write-execute (MDWE)".

 - Waiman Long did some kmemleak cleanup and bugfixing in the series
   "mm/kmemleak: Simplify kmemleak_cond_resched() & fix UAF".

 - T.J. Alumbaugh has contributed some MGLRU cleanup work in his series
   "mm: multi-gen LRU: improve".

 - Jiaqi Yan has provided some enhancements to our memory error
   statistics reporting, mainly by presenting the statistics on a
   per-node basis. See the series "Introduce per NUMA node memory error
   statistics".

 - Mel Gorman has a second and hopefully final shot at fixing a CPU-hog
   regression in compaction via his series "Fix excessive CPU usage
   during compaction".

 - Christoph Hellwig does some vmalloc maintenance work in the series
   "cleanup vfree and vunmap".

 - Christoph Hellwig has removed block_device_operations.rw_page() in
   ths series "remove ->rw_page".

 - We get some maple_tree improvements and cleanups in Liam Howlett's
   series "VMA tree type safety and remove __vma_adjust()".

 - Suren Baghdasaryan has done some work on the maintainability of our
   vm_flags handling in the series "introduce vm_flags modifier
   functions".

 - Some pagemap cleanup and generalization work in Mike Rapoport's
   series "mm, arch: add generic implementation of pfn_valid() for
   FLATMEM" and "fixups for generic implementation of pfn_valid()"

 - Baoquan He has done some work to make /proc/vmallocinfo and
   /proc/kcore better represent the real state of things in his series
   "mm/vmalloc.c: allow vread() to read out vm_map_ram areas".

 - Jason Gunthorpe rationalized the GUP system's interface to the rest
   of the kernel in the series "Simplify the external interface for
   GUP".

 - SeongJae Park wishes to migrate people from DAMON's debugfs interface
   over to its sysfs interface. To support this, we'll temporarily be
   printing warnings when people use the debugfs interface. See the
   series "mm/damon: deprecate DAMON debugfs interface".

 - Andrey Konovalov provided the accurately named "lib/stackdepot: fixes
   and clean-ups" series.

 - Huang Ying has provided a dramatic reduction in migration's TLB flush
   IPI rates with the series "migrate_pages(): batch TLB flushing".

 - Arnd Bergmann has some objtool fixups in "objtool warning fixes".

* tag 'mm-stable-2023-02-20-13-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (505 commits)
  include/linux/migrate.h: remove unneeded externs
  mm/memory_hotplug: cleanup return value handing in do_migrate_range()
  mm/uffd: fix comment in handling pte markers
  mm: change to return bool for isolate_movable_page()
  mm: hugetlb: change to return bool for isolate_hugetlb()
  mm: change to return bool for isolate_lru_page()
  mm: change to return bool for folio_isolate_lru()
  objtool: add UACCESS exceptions for __tsan_volatile_read/write
  kmsan: disable ftrace in kmsan core code
  kasan: mark addr_has_metadata __always_inline
  mm: memcontrol: rename memcg_kmem_enabled()
  sh: initialize max_mapnr
  m68k/nommu: add missing definition of ARCH_PFN_OFFSET
  mm: percpu: fix incorrect size in pcpu_obj_full_size()
  maple_tree: reduce stack usage with gcc-9 and earlier
  mm: page_alloc: call panic() when memoryless node allocation fails
  mm: multi-gen LRU: avoid futile retries
  migrate_pages: move THP/hugetlb migration support check to simplify code
  migrate_pages: batch flushing TLB
  migrate_pages: share more code between _unmap and _move
  ...

1 files changed, 141 insertions, 9 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index cd28a100d9e4..9fb1b03b83b2 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -7,6 +7,7 @@
 
 #include <linux/spinlock.h>
 #include <linux/list.h>
+#include <linux/list_nulls.h>
 #include <linux/wait.h>
 #include <linux/bitops.h>
 #include <linux/cache.h>
@@ -312,7 +313,7 @@ enum lruvec_flags {
  * They form a sliding window of a variable size [MIN_NR_GENS, MAX_NR_GENS]. An
  * offset within MAX_NR_GENS, i.e., gen, indexes the LRU list of the
  * corresponding generation. The gen counter in folio->flags stores gen+1 while
- * a page is on one of lrugen->lists[]. Otherwise it stores 0.
+ * a page is on one of lrugen->folios[]. Otherwise it stores 0.
  *
  * A page is added to the youngest generation on faulting. The aging needs to
  * check the accessed bit at least twice before handing this page over to the
@@ -324,8 +325,8 @@ enum lruvec_flags {
  * rest of generations, if they exist, are considered inactive. See
  * lru_gen_is_active().
  *
- * PG_active is always cleared while a page is on one of lrugen->lists[] so that
- * the aging needs not to worry about it. And it's set again when a page
+ * PG_active is always cleared while a page is on one of lrugen->folios[] so
+ * that the aging needs not to worry about it. And it's set again when a page
  * considered active is isolated for non-reclaiming purposes, e.g., migration.
  * See lru_gen_add_folio() and lru_gen_del_folio().
  *
@@ -404,7 +405,7 @@ enum {
  * The number of pages in each generation is eventually consistent and therefore
  * can be transiently negative when reset_batch_size() is pending.
  */
-struct lru_gen_struct {
+struct lru_gen_folio {
 	/* the aging increments the youngest generation number */
 	unsigned long max_seq;
 	/* the eviction increments the oldest generation numbers */
@@ -412,7 +413,7 @@ struct lru_gen_struct {
 	/* the birth time of each generation in jiffies */
 	unsigned long timestamps[MAX_NR_GENS];
 	/* the multi-gen LRU lists, lazily sorted on eviction */
-	struct list_head lists[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES];
+	struct list_head folios[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES];
 	/* the multi-gen LRU sizes, eventually consistent */
 	long nr_pages[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES];
 	/* the exponential moving average of refaulted */
@@ -426,6 +427,14 @@ struct lru_gen_struct {
 	atomic_long_t refaulted[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS];
 	/* whether the multi-gen LRU is enabled */
 	bool enabled;
+#ifdef CONFIG_MEMCG
+	/* the memcg generation this lru_gen_folio belongs to */
+	u8 gen;
+	/* the list segment this lru_gen_folio belongs to */
+	u8 seg;
+	/* per-node lru_gen_folio list for global reclaim */
+	struct hlist_nulls_node list;
+#endif
 };
 
 enum {
@@ -461,7 +470,7 @@ struct lru_gen_mm_state {
 struct lru_gen_mm_walk {
 	/* the lruvec under reclaim */
 	struct lruvec *lruvec;
-	/* unstable max_seq from lru_gen_struct */
+	/* unstable max_seq from lru_gen_folio */
 	unsigned long max_seq;
 	/* the next address within an mm to scan */
 	unsigned long next_addr;
@@ -479,12 +488,87 @@ void lru_gen_init_lruvec(struct lruvec *lruvec);
 void lru_gen_look_around(struct page_vma_mapped_walk *pvmw);
 
 #ifdef CONFIG_MEMCG
+
+/*
+ * For each node, memcgs are divided into two generations: the old and the
+ * young. For each generation, memcgs are randomly sharded into multiple bins
+ * to improve scalability. For each bin, the hlist_nulls is virtually divided
+ * into three segments: the head, the tail and the default.
+ *
+ * An onlining memcg is added to the tail of a random bin in the old generation.
+ * The eviction starts at the head of a random bin in the old generation. The
+ * per-node memcg generation counter, whose reminder (mod MEMCG_NR_GENS) indexes
+ * the old generation, is incremented when all its bins become empty.
+ *
+ * There are four operations:
+ * 1. MEMCG_LRU_HEAD, which moves an memcg to the head of a random bin in its
+ *    current generation (old or young) and updates its "seg" to "head";
+ * 2. MEMCG_LRU_TAIL, which moves an memcg to the tail of a random bin in its
+ *    current generation (old or young) and updates its "seg" to "tail";
+ * 3. MEMCG_LRU_OLD, which moves an memcg to the head of a random bin in the old
+ *    generation, updates its "gen" to "old" and resets its "seg" to "default";
+ * 4. MEMCG_LRU_YOUNG, which moves an memcg to the tail of a random bin in the
+ *    young generation, updates its "gen" to "young" and resets its "seg" to
+ *    "default".
+ *
+ * The events that trigger the above operations are:
+ * 1. Exceeding the soft limit, which triggers MEMCG_LRU_HEAD;
+ * 2. The first attempt to reclaim an memcg below low, which triggers
+ *    MEMCG_LRU_TAIL;
+ * 3. The first attempt to reclaim an memcg below reclaimable size threshold,
+ *    which triggers MEMCG_LRU_TAIL;
+ * 4. The second attempt to reclaim an memcg below reclaimable size threshold,
+ *    which triggers MEMCG_LRU_YOUNG;
+ * 5. Attempting to reclaim an memcg below min, which triggers MEMCG_LRU_YOUNG;
+ * 6. Finishing the aging on the eviction path, which triggers MEMCG_LRU_YOUNG;
+ * 7. Offlining an memcg, which triggers MEMCG_LRU_OLD.
+ *
+ * Note that memcg LRU only applies to global reclaim, and the round-robin
+ * incrementing of their max_seq counters ensures the eventual fairness to all
+ * eligible memcgs. For memcg reclaim, it still relies on mem_cgroup_iter().
+ */
+#define MEMCG_NR_GENS	2
+#define MEMCG_NR_BINS	8
+
+struct lru_gen_memcg {
+	/* the per-node memcg generation counter */
+	unsigned long seq;
+	/* each memcg has one lru_gen_folio per node */
+	unsigned long nr_memcgs[MEMCG_NR_GENS];
+	/* per-node lru_gen_folio list for global reclaim */
+	struct hlist_nulls_head	fifo[MEMCG_NR_GENS][MEMCG_NR_BINS];
+	/* protects the above */
+	spinlock_t lock;
+};
+
+void lru_gen_init_pgdat(struct pglist_data *pgdat);
+
 void lru_gen_init_memcg(struct mem_cgroup *memcg);
 void lru_gen_exit_memcg(struct mem_cgroup *memcg);
-#endif
+void lru_gen_online_memcg(struct mem_cgroup *memcg);
+void lru_gen_offline_memcg(struct mem_cgroup *memcg);
+void lru_gen_release_memcg(struct mem_cgroup *memcg);
+void lru_gen_soft_reclaim(struct lruvec *lruvec);
+
+#else /* !CONFIG_MEMCG */
+
+#define MEMCG_NR_GENS	1
+
+struct lru_gen_memcg {
+};
+
+static inline void lru_gen_init_pgdat(struct pglist_data *pgdat)
+{
+}
+
+#endif /* CONFIG_MEMCG */
 
 #else /* !CONFIG_LRU_GEN */
 
+static inline void lru_gen_init_pgdat(struct pglist_data *pgdat)
+{
+}
+
 static inline void lru_gen_init_lruvec(struct lruvec *lruvec)
 {
 }
@@ -494,6 +578,7 @@ static inline void lru_gen_look_around(struct page_vma_mapped_walk *pvmw)
 }
 
 #ifdef CONFIG_MEMCG
+
 static inline void lru_gen_init_memcg(struct mem_cgroup *memcg)
 {
 }
@@ -501,7 +586,24 @@ static inline void lru_gen_init_memcg(struct mem_cgroup *memcg)
 static inline void lru_gen_exit_memcg(struct mem_cgroup *memcg)
 {
 }
-#endif
+
+static inline void lru_gen_online_memcg(struct mem_cgroup *memcg)
+{
+}
+
+static inline void lru_gen_offline_memcg(struct mem_cgroup *memcg)
+{
+}
+
+static inline void lru_gen_release_memcg(struct mem_cgroup *memcg)
+{
+}
+
+static inline void lru_gen_soft_reclaim(struct lruvec *lruvec)
+{
+}
+
+#endif /* CONFIG_MEMCG */
 
 #endif /* CONFIG_LRU_GEN */
 
@@ -524,7 +626,7 @@ struct lruvec {
 	unsigned long			flags;
 #ifdef CONFIG_LRU_GEN
 	/* evictable pages divided into generations */
-	struct lru_gen_struct		lrugen;
+	struct lru_gen_folio		lrugen;
 	/* to concurrently iterate lru_gen_mm_list */
 	struct lru_gen_mm_state		mm_state;
 #endif
@@ -1110,6 +1212,31 @@ struct deferred_split {
 };
 #endif
 
+#ifdef CONFIG_MEMORY_FAILURE
+/*
+ * Per NUMA node memory failure handling statistics.
+ */
+struct memory_failure_stats {
+	/*
+	 * Number of raw pages poisoned.
+	 * Cases not accounted: memory outside kernel control, offline page,
+	 * arch-specific memory_failure (SGX), hwpoison_filter() filtered
+	 * error events, and unpoison actions from hwpoison_unpoison.
+	 */
+	unsigned long total;
+	/*
+	 * Recovery results of poisoned raw pages handled by memory_failure,
+	 * in sync with mf_result.
+	 * total = ignored + failed + delayed + recovered.
+	 * total * PAGE_SIZE * #nodes = /proc/meminfo/HardwareCorrupted.
+	 */
+	unsigned long ignored;
+	unsigned long failed;
+	unsigned long delayed;
+	unsigned long recovered;
+};
+#endif
+
 /*
  * On NUMA machines, each NUMA node would have a pg_data_t to describe
  * it's memory layout. On UMA machines there is a single pglist_data which
@@ -1243,6 +1370,8 @@ typedef struct pglist_data {
 #ifdef CONFIG_LRU_GEN
 	/* kswap mm walk data */
 	struct lru_gen_mm_walk	mm_walk;
+	/* lru_gen_folio list */
+	struct lru_gen_memcg memcg_lru;
 #endif
 
 	CACHELINE_PADDING(_pad2_);
@@ -1253,6 +1382,9 @@ typedef struct pglist_data {
 #ifdef CONFIG_NUMA
 	struct memory_tier __rcu *memtier;
 #endif
+#ifdef CONFIG_MEMORY_FAILURE
+	struct memory_failure_stats mf_stats;
+#endif
 } pg_data_t;
 
 #define node_present_pages(nid)	(NODE_DATA(nid)->node_present_pages)