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, 65 insertions, 3 deletions

diff --git a/include/linux/damon.h b/include/linux/damon.h
index ad15a5b88e3a..d5d4d19928e0 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -8,6 +8,7 @@
 #ifndef _DAMON_H_
 #define _DAMON_H_
 
+#include <linux/memcontrol.h>
 #include <linux/mutex.h>
 #include <linux/time64.h>
 #include <linux/types.h>
@@ -90,6 +91,12 @@ struct damon_target {
  * @DAMOS_LRU_DEPRIO:	Deprioritize the region on its LRU lists.
  * @DAMOS_STAT:		Do nothing but count the stat.
  * @NR_DAMOS_ACTIONS:	Total number of DAMOS actions
+ *
+ * The support of each action is up to running &struct damon_operations.
+ * &enum DAMON_OPS_VADDR and &enum DAMON_OPS_FVADDR supports all actions except
+ * &enum DAMOS_LRU_PRIO and &enum DAMOS_LRU_DEPRIO.  &enum DAMON_OPS_PADDR
+ * supports only &enum DAMOS_PAGEOUT, &enum DAMOS_LRU_PRIO, &enum
+ * DAMOS_LRU_DEPRIO, and &DAMOS_STAT.
  */
 enum damos_action {
 	DAMOS_WILLNEED,
@@ -216,6 +223,44 @@ struct damos_stat {
 };
 
 /**
+ * enum damos_filter_type - Type of memory for &struct damos_filter
+ * @DAMOS_FILTER_TYPE_ANON:	Anonymous pages.
+ * @DAMOS_FILTER_TYPE_MEMCG:	Specific memcg's pages.
+ * @NR_DAMOS_FILTER_TYPES:	Number of filter types.
+ *
+ * The support of each filter type is up to running &struct damon_operations.
+ * &enum DAMON_OPS_PADDR is supporting all filter types, while
+ * &enum DAMON_OPS_VADDR and &enum DAMON_OPS_FVADDR are not supporting any
+ * filter types.
+ */
+enum damos_filter_type {
+	DAMOS_FILTER_TYPE_ANON,
+	DAMOS_FILTER_TYPE_MEMCG,
+	NR_DAMOS_FILTER_TYPES,
+};
+
+/**
+ * struct damos_filter - DAMOS action target memory filter.
+ * @type:	Type of the page.
+ * @matching:	If the matching page should filtered out or in.
+ * @memcg_id:	Memcg id of the question if @type is DAMOS_FILTER_MEMCG.
+ * @list:	List head for siblings.
+ *
+ * Before applying the &damos->action to a memory region, DAMOS checks if each
+ * page of the region matches to this and avoid applying the action if so.
+ * Note that the check support is up to &struct damon_operations
+ * implementation.
+ */
+struct damos_filter {
+	enum damos_filter_type type;
+	bool matching;
+	union {
+		unsigned short memcg_id;
+	};
+	struct list_head list;
+};
+
+/**
  * struct damos_access_pattern - Target access pattern of the given scheme.
  * @min_sz_region:	Minimum size of target regions.
  * @max_sz_region:	Maximum size of target regions.
@@ -239,6 +284,7 @@ struct damos_access_pattern {
  * @action:		&damo_action to be applied to the target regions.
  * @quota:		Control the aggressiveness of this scheme.
  * @wmarks:		Watermarks for automated (in)activation of this scheme.
+ * @filters:		Additional set of &struct damos_filter for &action.
  * @stat:		Statistics of this scheme.
  * @list:		List head for siblings.
  *
@@ -254,6 +300,10 @@ struct damos_access_pattern {
  * If all schemes that registered to a &struct damon_ctx are inactive, DAMON
  * stops monitoring and just repeatedly checks the watermarks.
  *
+ * Before applying the &action to a memory region, &struct damon_operations
+ * implementation could check pages of the region and skip &action to respect
+ * &filters
+ *
  * After applying the &action to each region, &stat_count and &stat_sz is
  * updated to reflect the number of regions and total size of regions that the
  * &action is applied.
@@ -263,6 +313,7 @@ struct damos {
 	enum damos_action action;
 	struct damos_quota quota;
 	struct damos_watermarks wmarks;
+	struct list_head filters;
 	struct damos_stat stat;
 	struct list_head list;
 };
@@ -303,10 +354,10 @@ struct damon_ctx;
  * users should register the low level operations for their target address
  * space and usecase via the &damon_ctx.ops.  Then, the monitoring thread
  * (&damon_ctx.kdamond) calls @init and @prepare_access_checks before starting
- * the monitoring, @update after each &damon_ctx.ops_update_interval, and
+ * the monitoring, @update after each &damon_attrs.ops_update_interval, and
  * @check_accesses, @target_valid and @prepare_access_checks after each
- * &damon_ctx.sample_interval.  Finally, @reset_aggregated is called after each
- * &damon_ctx.aggr_interval.
+ * &damon_attrs.sample_interval.  Finally, @reset_aggregated is called after
+ * each &damon_attrs.aggr_interval.
  *
  * Each &struct damon_operations instance having valid @id can be registered
  * via damon_register_ops() and selected by damon_select_ops() later.
@@ -516,6 +567,12 @@ static inline unsigned long damon_sz_region(struct damon_region *r)
 #define damon_for_each_scheme_safe(s, next, ctx) \
 	list_for_each_entry_safe(s, next, &(ctx)->schemes, list)
 
+#define damos_for_each_filter(f, scheme) \
+	list_for_each_entry(f, &(scheme)->filters, list)
+
+#define damos_for_each_filter_safe(f, next, scheme) \
+	list_for_each_entry_safe(f, next, &(scheme)->filters, list)
+
 #ifdef CONFIG_DAMON
 
 struct damon_region *damon_new_region(unsigned long start, unsigned long end);
@@ -536,6 +593,11 @@ void damon_destroy_region(struct damon_region *r, struct damon_target *t);
 int damon_set_regions(struct damon_target *t, struct damon_addr_range *ranges,
 		unsigned int nr_ranges);
 
+struct damos_filter *damos_new_filter(enum damos_filter_type type,
+		bool matching);
+void damos_add_filter(struct damos *s, struct damos_filter *f);
+void damos_destroy_filter(struct damos_filter *f);
+
 struct damos *damon_new_scheme(struct damos_access_pattern *pattern,
 			enum damos_action action, struct damos_quota *quota,
 			struct damos_watermarks *wmarks);