[RFC PATCH v3 19/31] mm: memory,memlayout: add refresh_memory_blocks() for Dynamic NUMA.

[Cody P Schafer]

Properly update the sysfs info when memory blocks move between nodes
due to a Dynamic NUMA reconfiguration.
---
 drivers/base/memory.c  | 39 +++++++++++++++++++++++++++++++++++++++
 include/linux/memory.h |  5 +++++
 mm/memlayout.c         |  3 +++
 3 files changed, 47 insertions(+)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 90e387c..db1b034 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -15,6 +15,7 @@
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/kobject.h>
+#include <linux/memlayout.h>
 #include <linux/memory.h>
 #include <linux/memory_hotplug.h>
 #include <linux/mm.h>
@@ -700,6 +701,44 @@ bool is_memblock_offlined(struct memory_block *mem)
 	return mem->state == MEM_OFFLINE;
 }
 
+#if defined(CONFIG_DYNAMIC_NUMA)
+int refresh_memory_blocks(struct memlayout *ml)
+{
+	struct subsys_dev_iter iter;
+	struct device *dev;
+	/* XXX: 4th arg is (struct device_type *), can we spec one? */
+	mutex_lock(&mem_sysfs_mutex);
+	subsys_dev_iter_init(&iter, &memory_subsys, NULL, NULL);
+
+	while ((dev = subsys_dev_iter_next(&iter))) {
+		struct memory_block *mem_blk = container_of(dev, struct memory_block, dev);
+		unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
+		unsigned long end_pfn   = section_nr_to_pfn(mem_blk->end_section_nr + 1);
+		struct rangemap_entry *rme = memlayout_pfn_to_rme_higher(ml, start_pfn);
+		unsigned long pfn = start_pfn;
+
+		if (!rme || !rme_bounds_pfn(rme, pfn)) {
+			pr_warn("memory block %s {sec %lx-%lx}, {pfn %05lx-%05lx} is not bounded by the memlayout %pK\n",
+					dev_name(dev),
+					mem_blk->start_section_nr, mem_blk->end_section_nr,
+					start_pfn, end_pfn, ml);
+			continue;
+		}
+
+		unregister_mem_block_under_nodes(mem_blk);
+
+		for (; pfn < end_pfn && rme; rme = rme_next(rme)) {
+			register_mem_block_under_node(mem_blk, rme->nid);
+			pfn = rme->pfn_end + 1;
+		}
+	}
+
+	subsys_dev_iter_exit(&iter);
+	mutex_unlock(&mem_sysfs_mutex);
+	return 0;
+}
+#endif
+
 /*
  * Initialize the sysfs support for memory devices...
  */
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 85c31a8..8f1dc43 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -143,6 +143,11 @@ enum mem_add_context { BOOT, HOTPLUG };
 #define unregister_hotmemory_notifier(nb)  ({ (void)(nb); })
 #endif
 
+#ifdef CONFIG_DYNAMIC_NUMA
+struct memlayout;
+extern int refresh_memory_blocks(struct memlayout *ml);
+#endif
+
 /*
  * 'struct memory_accessor' is a generic interface to provide
  * in-kernel access to persistent memory such as i2c or SPI EEPROMs
diff --git a/mm/memlayout.c b/mm/memlayout.c
index 0a1a602..8b9ba9a 100644
--- a/mm/memlayout.c
+++ b/mm/memlayout.c
@@ -9,6 +9,7 @@
 #include <linux/dnuma.h>
 #include <linux/export.h>
 #include <linux/memblock.h>
+#include <linux/memory.h>
 #include <linux/printk.h>
 #include <linux/rbtree.h>
 #include <linux/rcupdate.h>
@@ -300,6 +301,8 @@ void memlayout_commit(struct memlayout *ml)
 	drain_all_pages();
 	/* All new page allocations now match the memlayout */
 
+	refresh_memory_blocks(ml);
+
 	mutex_unlock(&memlayout_lock);
 }
 
-- 
1.8.2.2

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