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authorMichal Hocko <mhocko@suse.com>2022-03-22 14:47:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-22 15:57:10 -0700
commit70b5b46a754245d383811b4d2f2c76c34bb7e145 (patch)
tree56660bed8475d45d75027150957ea9b8468e10ca
parent390511e1476eb1cc41d420a7661b33f4d8584c3f (diff)
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/20220127085305.20890-5-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Rafael Aquini <raquini@redhat.com> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Oscar Salvador <osalvador@suse.de> Cc: Alexey Makhalov <amakhalov@vmware.com> Cc: Christoph Lameter <cl@linux.com> Cc: Dennis Zhou <dennis@kernel.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Nico Pache <npache@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Wei Yang <richard.weiyang@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/memory_hotplug.h2
-rw-r--r--mm/memory_hotplug.c28
-rw-r--r--mm/page_alloc.c25
3 files changed, 27 insertions, 28 deletions
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 60f09d3ebb3d..76bf2de86def 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -319,7 +319,7 @@ extern void set_zone_contiguous(struct zone *zone);
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,
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 55c3e5309088..a4f69d399929 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1166,39 +1166,16 @@ static pg_data_t __ref *hotadd_init_pgdat(int nid)
{
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_pgdat(int nid)
* 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);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4f141a4e5b64..d32a635f2c72 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7466,12 +7466,33 @@ static void __meminit zone_init_internals(struct zone *zone, enum zone_type idx,
* 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);
}