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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2013-09-11 14:22:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:57:48 -0700
commite632a938d914d271bec26e570d36c755a1e35e4c (patch)
treee0912384cab7b9bdc3eacd4b3e232207f7c3944d /mm/migrate.c
parente2d8cf405525d83e6ca42969be460f94b0339798 (diff)
downloadop-kernel-dev-e632a938d914d271bec26e570d36c755a1e35e4c.zip
op-kernel-dev-e632a938d914d271bec26e570d36c755a1e35e4c.tar.gz
mm: migrate: add hugepage migration code to move_pages()
Extend move_pages() to handle vma with VM_HUGETLB set. We will be able to migrate hugepage with move_pages(2) after applying the enablement patch which comes later in this series. We avoid getting refcount on tail pages of hugepage, because unlike thp, hugepage is not split and we need not care about races with splitting. And migration of larger (1GB for x86_64) hugepage are not enabled. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: Andi Kleen <ak@linux.intel.com> Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Hugh Dickins <hughd@google.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Rik van Riel <riel@redhat.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
-rw-r--r--mm/migrate.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 3ec47d3..d313737 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1092,7 +1092,11 @@ static struct page *new_page_node(struct page *p, unsigned long private,
*result = &pm->status;
- return alloc_pages_exact_node(pm->node,
+ if (PageHuge(p))
+ return alloc_huge_page_node(page_hstate(compound_head(p)),
+ pm->node);
+ else
+ return alloc_pages_exact_node(pm->node,
GFP_HIGHUSER_MOVABLE | GFP_THISNODE, 0);
}
@@ -1152,6 +1156,11 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
!migrate_all)
goto put_and_set;
+ if (PageHuge(page)) {
+ isolate_huge_page(page, &pagelist);
+ goto put_and_set;
+ }
+
err = isolate_lru_page(page);
if (!err) {
list_add_tail(&page->lru, &pagelist);
@@ -1174,7 +1183,7 @@ set_status:
err = migrate_pages(&pagelist, new_page_node,
(unsigned long)pm, MIGRATE_SYNC, MR_SYSCALL);
if (err)
- putback_lru_pages(&pagelist);
+ putback_movable_pages(&pagelist);
}
up_read(&mm->mmap_sem);
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