On 09/21/2016 10:38 AM, Li Zhong wrote:
Commit 9bb627be47a5 ("mem-hotplug: don't clear the only node in
new_node_page()") prevents allocating from an empty nodemask, but as David
points out, it is still wrong. As node_online_map may include memoryless
nodes, only allocating from these nodes is meaningless.
Right, those pesky memoryless nodes...
This patch uses node_states[N_MEMORY] mask to prevent the above case.
Suggested-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
---
mm/memory_hotplug.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index b58906b..9d29ba0 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1555,8 +1555,8 @@ static struct page *new_node_page(struct page *page, unsigned long private,
{
gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE;
int nid = page_to_nid(page);
- nodemask_t nmask = node_online_map;
- struct page *new_page;
+ nodemask_t nmask = node_states[N_MEMORY];
+ struct page *new_page = NULL;
/*
* TODO: allocate a destination hugepage from a nearest neighbor node,
@@ -1567,14 +1567,14 @@ static struct page *new_node_page(struct page *page, unsigned long private,
return alloc_huge_page_node(page_hstate(compound_head(page)),
next_node_in(nid, nmask));
- if (nid != next_node_in(nid, nmask))
- node_clear(nid, nmask);
+ node_clear(nid, nmask);
if (PageHighMem(page)
|| (zone_idx(page_zone(page)) == ZONE_MOVABLE))
gfp_mask |= __GFP_HIGHMEM;
- new_page = __alloc_pages_nodemask(gfp_mask, 0,
+ if (!nodes_empty(nmask))
+ new_page = __alloc_pages_nodemask(gfp_mask, 0,
node_zonelist(nid, gfp_mask), &nmask);
if (!new_page)
new_page = __alloc_pages(gfp_mask, 0,
--
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