mm: memory_hotplug: memory hotremove supports thp migration

This patch enables thp migration for memory hotremove.

Link: http://lkml.kernel.org/r/20170717193955.20207-11-zi.yan@sent.com
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Zi Yan <zi.yan@cs.rutgers.edu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: David Nellans <dnellans@nvidia.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 3e0d405..ce15989 100644 (file)
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -35,15 +35,28 @@ static inline struct page *new_page_nodemask(struct page *page,
                                int preferred_nid, nodemask_t *nodemask)
 {
        gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
+       unsigned int order = 0;
+       struct page *new_page = NULL;
 
        if (PageHuge(page))
                return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
                                preferred_nid, nodemask);
 
+       if (thp_migration_supported() && PageTransHuge(page)) {
+               order = HPAGE_PMD_ORDER;
+               gfp_mask |= GFP_TRANSHUGE;
+       }
+
        if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
                gfp_mask |= __GFP_HIGHMEM;
 
-       return __alloc_pages_nodemask(gfp_mask, 0, preferred_nid, nodemask);
+       new_page = __alloc_pages_nodemask(gfp_mask, order,
+                               preferred_nid, nodemask);
+
+       if (new_page && PageTransHuge(page))
+               prep_transhuge_page(new_page);
+
+       return new_page;
 }
 
 #ifdef CONFIG_MIGRATION

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 73bf17d..1f92fb8 100644 (file)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1380,7 +1380,9 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
                        if (isolate_huge_page(page, &source))
                                move_pages -= 1 << compound_order(head);
                        continue;
-               }
+               } else if (thp_migration_supported() && PageTransHuge(page))
+                       pfn = page_to_pfn(compound_head(page))
+                               + hpage_nr_pages(page) - 1;
 
                if (!get_page_unless_zero(page))
                        continue;