[PATCH v13 06/12] mm: hugetlb: set the PageHWPoison to the raw error page
From: Muchun Song <hidden>
Date: 2021-01-17 15:16:30
Also in:
linux-fsdevel, linux-mm, lkml
Subsystem:
hugetlb subsystem, memory management, the rest · Maintainers:
Muchun Song, Oscar Salvador, Andrew Morton, Linus Torvalds
Because we reuse the first tail vmemmap page frame and remap it with read-only, we cannot set the PageHWPosion on a tail page. So we can use the head[4].private to record the real error page index and set the raw error page PageHWPoison later. Signed-off-by: Muchun Song <redacted> Reviewed-by: Oscar Salvador <osalvador@suse.de> --- mm/hugetlb.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 61 insertions(+), 8 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d11c32fcdb38..6caaa7e5dd2a 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c@@ -1358,6 +1358,63 @@ static inline void __update_and_free_page(struct hstate *h, struct page *page) schedule_work(&hpage_update_work); } +#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP +static inline void hwpoison_subpage_deliver(struct hstate *h, struct page *head) +{ + struct page *page; + + if (!PageHWPoison(head) || !free_vmemmap_pages_per_hpage(h)) + return; + + page = head + page_private(head + 4); + + /* + * Move PageHWPoison flag from head page to the raw error page, + * which makes any subpages rather than the error page reusable. + */ + if (page != head) { + SetPageHWPoison(page); + ClearPageHWPoison(head); + } +} + +static inline void hwpoison_subpage_set(struct hstate *h, struct page *head, + struct page *page) +{ + if (!PageHWPoison(head)) + return; + + if (free_vmemmap_pages_per_hpage(h)) { + set_page_private(head + 4, page - head); + } else if (page != head) { + /* + * Move PageHWPoison flag from head page to the raw error page, + * which makes any subpages rather than the error page reusable. + */ + SetPageHWPoison(page); + ClearPageHWPoison(head); + } +} + +#else +static inline void hwpoison_subpage_deliver(struct hstate *h, struct page *head) +{ +} + +static inline void hwpoison_subpage_set(struct hstate *h, struct page *head, + struct page *page) +{ + if (PageHWPoison(head) && page != head) { + /* + * Move PageHWPoison flag from head page to the raw error page, + * which makes any subpages rather than the error page reusable. + */ + SetPageHWPoison(page); + ClearPageHWPoison(head); + } +} +#endif + static void update_and_free_page(struct hstate *h, struct page *page) { if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported())
@@ -1373,6 +1430,8 @@ static void __free_hugepage(struct hstate *h, struct page *page) { int i; + hwpoison_subpage_deliver(h, page); + for (i = 0; i < pages_per_huge_page(h); i++) { page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced | 1 << PG_dirty |
@@ -1845,14 +1904,8 @@ int dissolve_free_huge_page(struct page *page) int nid = page_to_nid(head); if (h->free_huge_pages - h->resv_huge_pages == 0) goto out; - /* - * Move PageHWPoison flag from head page to the raw error page, - * which makes any subpages rather than the error page reusable. - */ - if (PageHWPoison(head) && page != head) { - SetPageHWPoison(page); - ClearPageHWPoison(head); - } + + hwpoison_subpage_set(h, head, page); list_del(&head->lru); h->free_huge_pages--; h->free_huge_pages_node[nid]--;
--
2.11.0