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Subject[PATCH 2/2] mem-hotplug: use different mempolicy in alloc_migrate_target()
When we offline a node, the new page should alloced from other
nodes instead of the current node, because re-migrate is a waste of
time.
So use prefer mempolicy for hotplug, use default mempolicy for cma.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
---
include/linux/page-isolation.h | 2 +-
mm/memory_hotplug.c | 5 ++++-
mm/page_alloc.c | 2 +-
mm/page_isolation.c | 8 +++++---
4 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index 047d647..c163de3 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -65,7 +65,7 @@ undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
bool skip_hwpoisoned_pages);

-struct page *alloc_migrate_target(struct page *page, unsigned long private,
+struct page *alloc_migrate_target(struct page *page, unsigned long nid,
int **resultp);

#endif
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index e3cbdca..b5963bf 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1510,12 +1510,15 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
int move_pages = NR_OFFLINE_AT_ONCE_PAGES;
int not_managed = 0;
int ret = 0;
+ int nid = NUMA_NO_NODE;
LIST_HEAD(source);

for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) {
if (!pfn_valid(pfn))
continue;
page = pfn_to_page(pfn);
+ if (nid == NUMA_NO_NODE)
+ nid = next_node_in(page_to_nid(page), node_online_map);

if (PageHuge(page)) {
struct page *head = compound_head(page);
@@ -1568,7 +1571,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
* alloc_migrate_target should be improooooved!!
* migrate_pages returns # of failed pages.
*/
- ret = migrate_pages(&source, alloc_migrate_target, NULL, 0,
+ ret = migrate_pages(&source, alloc_migrate_target, NULL, nid,
MIGRATE_SYNC, MR_MEMORY_HOTPLUG);
if (ret)
putback_movable_pages(&source);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6903b69..b99f1c2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7322,7 +7322,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
cc->nr_migratepages -= nr_reclaimed;

ret = migrate_pages(&cc->migratepages, alloc_migrate_target,
- NULL, 0, cc->mode, MR_CMA);
+ NULL, NUMA_NO_NODE, cc->mode, MR_CMA);
}
if (ret < 0) {
putback_movable_pages(&cc->migratepages);
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 4f32c9f..f471be6 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -279,18 +279,20 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
return pfn < end_pfn ? -EBUSY : 0;
}

-struct page *alloc_migrate_target(struct page *page, unsigned long private,
+struct page *alloc_migrate_target(struct page *page, unsigned long nid,
int **resultp)
{
/*
- * TODO: allocate a destination hugepage from a nearest neighbor node,
+ * hugeTLB: allocate a destination page from a nearest neighbor node,
* accordance with memory policy of the user process if possible. For
* now as a simple work-around, we use the next node for destination.
+ * Normal page: use prefer mempolicy for destination if called by
+ * hotplug, use default mempolicy for destination if called by cma.
*/
if (PageHuge(page))
return alloc_huge_page_node(page_hstate(compound_head(page)),
next_node_in(page_to_nid(page),
node_online_map));
else
- return alloc_page(GFP_HIGHUSER_MOVABLE);
+ return alloc_pages_node(nid, GFP_HIGHUSER_MOVABLE, 0);
}
--
1.8.3.1

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