Re: [PATCH -V6 06/14] hugetlb: Simplify migrate_huge_page

On Thu, May 24, 2012 at 02:35:05PM -0700, David Rientjes wrote:

On Mon, 16 Apr 2012, Aneesh Kumar K.V wrote:

quoted

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 97cc273..1f092db 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c

@@ -1414,7 +1414,6 @@ static int soft_offline_huge_page(struct page *page, int flags)
 	int ret;
 	unsigned long pfn = page_to_pfn(page);
 	struct page *hpage = compound_head(page);
-	LIST_HEAD(pagelist);
 
 	ret = get_any_page(page, pfn, flags);
 	if (ret < 0)

@@ -1429,19 +1428,11 @@ static int soft_offline_huge_page(struct page *page, int flags)
 	}
 
 	/* Keep page count to indicate a given hugepage is isolated. */
-
-	list_add(&hpage->lru, &pagelist);
-	ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0,
-				true);
+	ret = migrate_huge_page(page, new_page, MPOL_MF_MOVE_ALL, 0, true);

Was this tested?  Shouldn't this be migrate_huge_page(compound_head(page), 
...)?

I tested this using madvise, but by not using tail pages. How about the below diff ?

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 4a45098..53a1495 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c

@@ -1428,8 +1428,8 @@ static int soft_offline_huge_page(struct page *page, int flags)
 	}
 
 	/* Keep page count to indicate a given hugepage is isolated. */
-	ret = migrate_huge_page(page, new_page, MPOL_MF_MOVE_ALL, 0, true);
-	put_page(page);
+	ret = migrate_huge_page(hpage, new_page, MPOL_MF_MOVE_ALL, 0, true);
+	put_page(hpage);
 	if (ret) {
 		pr_info("soft offline: %#lx: migration failed %d, type %lx\n",
 			pfn, ret, page->flags);

--

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