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Thu, 10 Dec 2020 03:11:56 -0800 (PST) MIME-Version: 1.0 References: <20201210035526.38938-1-songmuchun@bytedance.com> <20201210035526.38938-8-songmuchun@bytedance.com> In-Reply-To: <20201210035526.38938-8-songmuchun@bytedance.com> From: Muchun Song Date: Thu, 10 Dec 2020 19:11:19 +0800 Message-ID: Subject: Re: [PATCH v8 07/12] mm/hugetlb: Set the PageHWPoison to the raw error page To: Jonathan Corbet , Mike Kravetz , Thomas Gleixner , mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, Peter Zijlstra , viro@zeniv.linux.org.uk, Andrew Morton , paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, Randy Dunlap , oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, Mina Almasry , David Rientjes , Matthew Wilcox , Oscar Salvador , Michal Hocko , "Song Bao Hua (Barry Song)" , David Hildenbrand Cc: Xiongchun duan , linux-doc@vger.kernel.org, LKML , Linux Memory Management List , linux-fsdevel Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Dec 10, 2020 at 11:58 AM Muchun Song wrote: > > 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].mapping to record the real error page ^^^ private A typo. Will update the next version. Thanks. > index and set the raw error page PageHWPoison later. > > Signed-off-by: Muchun Song > --- > mm/hugetlb.c | 52 ++++++++++++++++++++++++++++++++++++++++++++-------- > 1 file changed, 44 insertions(+), 8 deletions(-) > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 542e6cb81321..06157df08d8e 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -1347,6 +1347,47 @@ static inline void __update_and_free_page(struct hstate *h, struct page *page) > schedule_work(&hpage_update_work); > } > > +static inline void subpage_hwpoison_deliver(struct hstate *h, struct page *head) > +{ > + struct page *page = head; > + > + if (!free_vmemmap_pages_per_hpage(h)) > + return; > + > + if (PageHWPoison(head)) > + 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 set_subpage_hwpoison(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); > + return; > + } > + > + /* > + * 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 void update_and_free_page(struct hstate *h, struct page *page) > { > if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported()) > @@ -1363,6 +1404,7 @@ static void __free_hugepage(struct hstate *h, struct page *page) > int i; > > alloc_huge_page_vmemmap(h, page); > + subpage_hwpoison_deliver(h, page); > > for (i = 0; i < pages_per_huge_page(h); i++) { > page[i].flags &= ~(1 << PG_locked | 1 << PG_error | > @@ -1840,14 +1882,8 @@ 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); > - } > + > + set_subpage_hwpoison(h, head, page); > list_del(&head->lru); > h->free_huge_pages--; > h->free_huge_pages_node[nid]--; > -- > 2.11.0 > -- Yours, Muchun