[167/227] mm, memory_hotplug: reorganize new pgdat initialization

Commit Message

Andrew Morton March 22, 2022, 9:47 p.m. UTC

From: Michal Hocko <[e-mail]>
Subject: mm, memory_hotplug: reorganize new pgdat initialization

When a !node_online node is brought up it needs a hotplug specific
initialization because the node could be either uninitialized yet or it
could have been recycled after previous hotremove.  hotadd_init_pgdat is
responsible for that.

Internal pgdat state is initialized at two places currently
	- hotadd_init_pgdat
	- free_area_init_core_hotplug

There is no real clear cut what should go where but this patch's chosen to
move the whole internal state initialization into
free_area_init_core_hotplug.  hotadd_init_pgdat is still responsible to
pull all the parts together - most notably to initialize zonelists because
those depend on the overall topology.

This patch doesn't introduce any functional change.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Michal Hocko <[e-mail]>
Acked-by: Rafael Aquini <[e-mail]>
Acked-by: David Hildenbrand <[e-mail]>
Reviewed-by: Oscar Salvador <[e-mail]>
Cc: Alexey Makhalov <[e-mail]>
Cc: Christoph Lameter <[e-mail]>
Cc: Dennis Zhou <[e-mail]>
Cc: Eric Dumazet <[e-mail]>
Cc: Mike Rapoport <[e-mail]>
Cc: Nico Pache <[e-mail]>
Cc: Tejun Heo <[e-mail]>
Cc: Wei Yang <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 include/linux/memory_hotplug.h |    2 +-
 mm/memory_hotplug.c            |   28 +++-------------------------
 mm/page_alloc.c                |   25 +++++++++++++++++++++++--
 3 files changed, 27 insertions(+), 28 deletions(-)

Patch

--- a/include/linux/memory_hotplug.h~mm-memory_hotplug-reorganize-new-pgdat-initialization
+++ a/include/linux/memory_hotplug.h
@@ -319,7 +319,7 @@  extern void set_zone_contiguous(struct z
 extern void clear_zone_contiguous(struct zone *zone);
 
 #ifdef CONFIG_MEMORY_HOTPLUG
-extern void __ref free_area_init_core_hotplug(int nid);
+extern void __ref free_area_init_core_hotplug(struct pglist_data *pgdat);
 extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
 extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
 extern int add_memory_resource(int nid, struct resource *resource,
--- a/mm/memory_hotplug.c~mm-memory_hotplug-reorganize-new-pgdat-initialization
+++ a/mm/memory_hotplug.c
@@ -1166,39 +1166,16 @@  static pg_data_t __ref *hotadd_init_pgda
 {
 	struct pglist_data *pgdat;
 
-	pgdat = NODE_DATA(nid);
-
 	/*
 	 * NODE_DATA is preallocated (free_area_init) but its internal
 	 * state is not allocated completely. Add missing pieces.
 	 * Completely offline nodes stay around and they just need
 	 * reintialization.
 	 */
-	if (pgdat->per_cpu_nodestats == &boot_nodestats) {
-		pgdat->per_cpu_nodestats =
-			alloc_percpu(struct per_cpu_nodestat);
-	} else {
-		int cpu;
-		/*
-		 * Reset the nr_zones, order and highest_zoneidx before reuse.
-		 * Note that kswapd will init kswapd_highest_zoneidx properly
-		 * when it starts in the near future.
-		 */
-		pgdat->nr_zones = 0;
-		pgdat->kswapd_order = 0;
-		pgdat->kswapd_highest_zoneidx = 0;
-		for_each_online_cpu(cpu) {
-			struct per_cpu_nodestat *p;
-
-			p = per_cpu_ptr(pgdat->per_cpu_nodestats, cpu);
-			memset(p, 0, sizeof(*p));
-		}
-	}
-
-	pgdat->node_start_pfn = 0;
+	pgdat = NODE_DATA(nid);
 
 	/* init node's zones as empty zones, we don't have any present pages.*/
-	free_area_init_core_hotplug(nid);
+	free_area_init_core_hotplug(pgdat);
 
 	/*
 	 * The node we allocated has no zone fallback lists. For avoiding
@@ -1210,6 +1187,7 @@  static pg_data_t __ref *hotadd_init_pgda
 	 * When memory is hot-added, all the memory is in offline state. So
 	 * clear all zones' present_pages because they will be updated in
 	 * online_pages() and offline_pages().
+	 * TODO: should be in free_area_init_core_hotplug?
 	 */
 	reset_node_managed_pages(pgdat);
 	reset_node_present_pages(pgdat);
--- a/mm/page_alloc.c~mm-memory_hotplug-reorganize-new-pgdat-initialization
+++ a/mm/page_alloc.c
@@ -7466,12 +7466,33 @@  static void __meminit zone_init_internal
  * NOTE: this function is only called during memory hotplug
  */
 #ifdef CONFIG_MEMORY_HOTPLUG
-void __ref free_area_init_core_hotplug(int nid)
+void __ref free_area_init_core_hotplug(struct pglist_data *pgdat)
 {
+	int nid = pgdat->node_id;
 	enum zone_type z;
-	pg_data_t *pgdat = NODE_DATA(nid);
+	int cpu;
 
 	pgdat_init_internals(pgdat);
+
+	if (pgdat->per_cpu_nodestats == &boot_nodestats)
+		pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat);
+
+	/*
+	 * Reset the nr_zones, order and highest_zoneidx before reuse.
+	 * Note that kswapd will init kswapd_highest_zoneidx properly
+	 * when it starts in the near future.
+	 */
+	pgdat->nr_zones = 0;
+	pgdat->kswapd_order = 0;
+	pgdat->kswapd_highest_zoneidx = 0;
+	pgdat->node_start_pfn = 0;
+	for_each_online_cpu(cpu) {
+		struct per_cpu_nodestat *p;
+
+		p = per_cpu_ptr(pgdat->per_cpu_nodestats, cpu);
+		memset(p, 0, sizeof(*p));
+	}
+
 	for (z = 0; z < MAX_NR_ZONES; z++)
 		zone_init_internals(&pgdat->node_zones[z], z, nid, 0);
 }