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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/compaction.h
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@@ -29,9 +29,6 @@
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 	/* compaction didn't start as it was deferred due to past failures */
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 	COMPACT_DEFERRED,
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-	/* compaction not active last round */
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-	COMPACT_INACTIVE = COMPACT_DEFERRED,
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-
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 	/* For more detailed tracepoint output - internal to compaction */
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 	COMPACT_NO_SUITABLE_PAGE,
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 	/* compaction should continue to another pageblock */
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@@ -85,20 +82,23 @@
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 #ifdef CONFIG_COMPACTION
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 extern int sysctl_compact_memory;
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+extern unsigned int sysctl_compaction_proactiveness;
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 extern int sysctl_compaction_handler(struct ctl_table *table, int write,
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-			void __user *buffer, size_t *length, loff_t *ppos);
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+			void *buffer, size_t *length, loff_t *ppos);
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+extern int compaction_proactiveness_sysctl_handler(struct ctl_table *table,
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+		int write, void *buffer, size_t *length, loff_t *ppos);
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 extern int sysctl_extfrag_threshold;
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-extern int sysctl_extfrag_handler(struct ctl_table *table, int write,
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-			void __user *buffer, size_t *length, loff_t *ppos);
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 extern int sysctl_compact_unevictable_allowed;
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+extern unsigned int extfrag_for_order(struct zone *zone, unsigned int order);
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 extern int fragmentation_index(struct zone *zone, unsigned int order);
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 extern enum compact_result try_to_compact_pages(gfp_t gfp_mask,
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 		unsigned int order, unsigned int alloc_flags,
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-		const struct alloc_context *ac, enum compact_priority prio);
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+		const struct alloc_context *ac, enum compact_priority prio,
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+		struct page **page);
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 extern void reset_isolation_suitable(pg_data_t *pgdat);
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 extern enum compact_result compaction_suitable(struct zone *zone, int order,
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-		unsigned int alloc_flags, int classzone_idx);
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+		unsigned int alloc_flags, int highest_zoneidx);
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 extern void defer_compaction(struct zone *zone, int order);
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 extern bool compaction_deferred(struct zone *zone, int order);
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@@ -130,11 +130,8 @@
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 	return false;
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 }
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-/*
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- * Compaction  has backed off for some reason. It might be throttling or
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- * lock contention. Retrying is still worthwhile.
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- */
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-static inline bool compaction_withdrawn(enum compact_result result)
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+/* Compaction needs reclaim to be performed first, so it can continue. */
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+static inline bool compaction_needs_reclaim(enum compact_result result)
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 {
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 	/*
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 	 * Compaction backed off due to watermark checks for order-0
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@@ -143,6 +140,16 @@
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 	if (result == COMPACT_SKIPPED)
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 		return true;
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+	return false;
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+}
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+
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+/*
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+ * Compaction has backed off for some reason after doing some work or none
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+ * at all. It might be throttling or lock contention. Retrying might be still
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+ * worthwhile, but with a higher priority if allowed.
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+ */
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+static inline bool compaction_withdrawn(enum compact_result result)
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+{
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 	/*
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 	 * If compaction is deferred for high-order allocations, it is
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 	 * because sync compaction recently failed. If this is the case
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@@ -176,7 +183,9 @@
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 extern int kcompactd_run(int nid);
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 extern void kcompactd_stop(int nid);
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-extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx);
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+extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int highest_zoneidx);
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+extern unsigned long isolate_and_split_free_page(struct page *page,
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+				struct list_head *list);
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 #else
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 static inline void reset_isolation_suitable(pg_data_t *pgdat)
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@@ -184,7 +193,7 @@
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 }
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 static inline enum compact_result compaction_suitable(struct zone *zone, int order,
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-					int alloc_flags, int classzone_idx)
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+					int alloc_flags, int highest_zoneidx)
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 {
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 	return COMPACT_SKIPPED;
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 }
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@@ -208,6 +217,11 @@
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 	return false;
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 }
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+static inline bool compaction_needs_reclaim(enum compact_result result)
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+{
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+	return false;
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+}
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+
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 static inline bool compaction_withdrawn(enum compact_result result)
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 {
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 	return true;
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@@ -221,14 +235,21 @@
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 {
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 }
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-static inline void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx)
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+static inline void wakeup_kcompactd(pg_data_t *pgdat,
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+				int order, int highest_zoneidx)
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 {
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+}
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+
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+static inline unsigned long isolate_and_split_free_page(struct page *page,
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+				struct list_head *list)
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+{
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+	return 0;
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 }
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 #endif /* CONFIG_COMPACTION */
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-#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
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 struct node;
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+#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
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 extern int compaction_register_node(struct node *node);
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 extern void compaction_unregister_node(struct node *node);
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