linux-kernel - [PATCH v1 08/12] mm: hwpoison: soft offline supports thp migration

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Date:   Mon, 26 Sep 2016 11:22:30 -0400
From:   zi.yan@...t.com
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     benh@...nel.crashing.org, mgorman@...hsingularity.net,
        kirill.shutemov@...ux.intel.com, akpm@...ux-foundation.org,
        dave.hansen@...ux.intel.com, n-horiguchi@...jp.nec.com
Subject: [PATCH v1 08/12] mm: hwpoison: soft offline supports thp migration

From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

This patch enables thp migration for soft offline.

Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---
 mm/memory-failure.c | 31 ++++++++++++-------------------
 1 file changed, 12 insertions(+), 19 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index e105f91..36eb064 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1494,7 +1494,17 @@ static struct page *new_page(struct page *p, unsigned long private, int **x)
 	if (PageHuge(p))
 		return alloc_huge_page_node(page_hstate(compound_head(p)),
 						   nid);
-	else
+	else if (thp_migration_supported() && PageTransHuge(p)) {
+		struct page *thp;
+
+		thp = alloc_pages_node(nid,
+			(GFP_TRANSHUGE | __GFP_THISNODE) & ~__GFP_RECLAIM,
+			HPAGE_PMD_ORDER);
+		if (!thp)
+			return NULL;
+		prep_transhuge_page(thp);
+		return thp;
+	} else
 		return __alloc_pages_node(nid, GFP_HIGHUSER_MOVABLE, 0);
 }
 
@@ -1697,28 +1707,11 @@ static int __soft_offline_page(struct page *page, int flags)
 static int soft_offline_in_use_page(struct page *page, int flags)
 {
 	int ret;
-	struct page *hpage = compound_head(page);
-
-	if (!PageHuge(page) && PageTransHuge(hpage)) {
-		lock_page(hpage);
-		if (!PageAnon(hpage) || unlikely(split_huge_page(hpage))) {
-			unlock_page(hpage);
-			if (!PageAnon(hpage))
-				pr_info("soft offline: %#lx: non anonymous thp\n", page_to_pfn(page));
-			else
-				pr_info("soft offline: %#lx: thp split failed\n", page_to_pfn(page));
-			put_hwpoison_page(hpage);
-			return -EBUSY;
-		}
-		unlock_page(hpage);
-		get_hwpoison_page(page);
-		put_hwpoison_page(hpage);
-	}
 
 	if (PageHuge(page))
 		ret = soft_offline_huge_page(page, flags);
 	else
-		ret = __soft_offline_page(page, flags);
+		ret = __soft_offline_page(compound_head(page), flags);
 
 	return ret;
 }
-- 
2.9.3