From c3114a84f7f96c9d5c73c8bfa7e21ff42fda97e2 Mon Sep 17 00:00:00 2001 From: Anshuman Khandual Date: Mon, 10 Jul 2017 15:47:41 -0700 Subject: mm: hugetlb: soft-offline: dissolve source hugepage after successful migration Currently hugepage migrated by soft-offline (i.e. due to correctable memory errors) is contained as a hugepage, which means many non-error pages in it are unreusable, i.e. wasted. This patch solves this issue by dissolving source hugepages into buddy. As done in previous patch, PageHWPoison is set only on a head page of the error hugepage. Then in dissoliving we move the PageHWPoison flag to the raw error page so that all healthy subpages return back to buddy. [arnd@arndb.de: fix warnings: replace some macros with inline functions] Link: http://lkml.kernel.org/r/20170609102544.2947326-1-arnd@arndb.de Link: http://lkml.kernel.org/r/1496305019-5493-5-git-send-email-n-horiguchi@ah.jp.nec.com Signed-off-by: Anshuman Khandual Signed-off-by: Naoya Horiguchi Signed-off-by: Arnd Bergmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory-failure.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) (limited to 'mm/memory-failure.c') diff --git a/mm/memory-failure.c b/mm/memory-failure.c index a9ddb0e72f5b..42c5803e6275 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1575,11 +1575,8 @@ static int soft_offline_huge_page(struct page *page, int flags) if (ret > 0) ret = -EIO; } else { - /* overcommit hugetlb page will be freed to buddy */ - SetPageHWPoison(page); if (PageHuge(page)) - dequeue_hwpoisoned_huge_page(hpage); - num_poisoned_pages_inc(); + dissolve_free_huge_page(page); } return ret; } -- cgit v1.2.3-59-g8ed1b