Le 14/09/2020 à 19:15, David Hildenbrand a écrit :
arch/ia64/mm/init.c | 4 +--
drivers/base/node.c | 86 ++++++++++++++++++++++++++++----------------
include/linux/node.h | 11 +++---
mm/memory_hotplug.c | 5 +--
4 files changed, 68 insertions(+), 38 deletions(-)
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index b5054b5e77c8..8e7b8c6c576e 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -538,7 +538,7 @@ virtual_memmap_init(u64 start, u64 end, void *arg)
if (map_start < map_end)
memmap_init_zone((unsigned long)(map_end - map_start),
args->nid, args->zone, page_to_pfn(map_start),
- MEMPLUG_EARLY, NULL);
+ MEMINIT_EARLY, NULL);
Patch #1.
Sure, this explains why I was able to build on ia64 but that's not the right place.
return 0;
}
@@ -548,7 +548,7 @@ memmap_init (unsigned long size, int nid, unsigned long zone,
{
if (!vmem_map) {
memmap_init_zone(size, nid, zone, start_pfn,
- MEMPLUG_EARLY, NULL);
+ MEMINIT_EARLY, NULL);
I'll fix that too.
} else {
struct page *start;
struct memmap_init_callback_data args;
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 508b80f6329b..01ee73c9d675 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -761,14 +761,36 @@ static int __ref get_nid_for_pfn(unsigned long pfn)
return pfn_to_nid(pfn);
}
+static int do_register_memory_block_under_node(int nid,
+ struct memory_block *mem_blk)
+{
+ int ret;
+
+ /*
+ * If this memory block spans multiple nodes, we only indicate
+ * the last processed node.
+ */
+ mem_blk->nid = nid;
+
+ ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
+ &mem_blk->dev.kobj,
+ kobject_name(&mem_blk->dev.kobj));
+ if (ret)
+ return ret;
+
+ return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
+ &node_devices[nid]->dev.kobj,
+ kobject_name(&node_devices[nid]->dev.kobj));
+}
+
/* register memory section under specified node if it spans that node */
-static int register_mem_sect_under_node(struct memory_block *mem_blk,
- void *arg)
+static int register_mem_block_under_node_early(struct memory_block *mem_blk,
+ void *arg)
{
unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
- int ret, nid = *(int *)arg;
+ int nid = *(int *)arg;
unsigned long pfn;
for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
@@ -785,38 +807,34 @@ static int register_mem_sect_under_node(struct memory_block *mem_blk,
}
/*
- * We need to check if page belongs to nid only for the boot
- * case, during hotplug we know that all pages in the memory
- * block belong to the same node.
- */
- if (system_state == SYSTEM_BOOTING) {
- page_nid = get_nid_for_pfn(pfn);
- if (page_nid < 0)
- continue;
- if (page_nid != nid)
- continue;
- }
-
- /*
- * If this memory block spans multiple nodes, we only indicate
- * the last processed node.
+ * We need to check if page belongs to nid only at the boot
+ * case because node's ranges can be interleaved.
*/
- mem_blk->nid = nid;
-
- ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
- &mem_blk->dev.kobj,
- kobject_name(&mem_blk->dev.kobj));
- if (ret)
- return ret;
+ page_nid = get_nid_for_pfn(pfn);
+ if (page_nid < 0)
+ continue;
+ if (page_nid != nid)
+ continue;
- return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
- &node_devices[nid]->dev.kobj,
- kobject_name(&node_devices[nid]->dev.kobj));
+ /* The memory block is registered to the first matching node */
That comment is misleading in that context.
A memory block is registered if there is at least a page that belongs to
the nid. It's perfectly fine to have a single memory block belong to
multiple NUMA nodes (when the split is within a memory block). I'd just
drop it.
I agree the comment is not accurate, I'll drop it.
