From: Michal Hocko <mhocko@suse.com>
To: Muchun Song <songmuchun@bytedance.com>
Cc: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com,
dave.hansen@linux.intel.com, luto@kernel.org,
peterz@infradead.org, viro@zeniv.linux.org.uk,
akpm@linux-foundation.org, paulmck@kernel.org,
mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com,
rdunlap@infradead.org, oneukum@suse.com,
anshuman.khandual@arm.com, jroedel@suse.de,
almasrymina@google.com, rientjes@google.com, willy@infradead.org,
osalvador@suse.de, song.bao.hua@hisilicon.com,
duanxiongchun@bytedance.com, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v5 15/21] mm/hugetlb: Set the PageHWPoison to the raw error page
Date: Fri, 20 Nov 2020 09:19:40 +0100 [thread overview]
Message-ID: <20201120081940.GE3200@dhcp22.suse.cz> (raw)
In-Reply-To: <20201120064325.34492-16-songmuchun@bytedance.com>
On Fri 20-11-20 14:43:19, Muchun Song wrote:
> Because we reuse the first tail page, if we set PageHWPosion on a
> tail page. It indicates that we may set PageHWPoison on a series
> of pages. So we can use the head[4].mapping to record the real
> error page index and set the raw error page PageHWPoison later.
This really begs more explanation. Maybe I misremember but If there
is a HWPoison hole in a hugepage then the whole page is demolished, no?
If that is the case then why do we care about tail pages?
> Signed-off-by: Muchun Song <songmuchun@bytedance.com>
> ---
> mm/hugetlb.c | 11 +++--------
> mm/hugetlb_vmemmap.h | 39 +++++++++++++++++++++++++++++++++++++++
> 2 files changed, 42 insertions(+), 8 deletions(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 055604d07046..b853aacd5c16 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1383,6 +1383,7 @@ static void __free_hugepage(struct hstate *h, struct page *page)
> int i;
>
> alloc_huge_page_vmemmap(h, page);
> + subpage_hwpoison_deliver(page);
>
> for (i = 0; i < pages_per_huge_page(h); i++) {
> page[i].flags &= ~(1 << PG_locked | 1 << PG_error |
> @@ -1944,14 +1945,8 @@ 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(head, page);
> list_del(&head->lru);
> h->free_huge_pages--;
> h->free_huge_pages_node[nid]--;
> diff --git a/mm/hugetlb_vmemmap.h b/mm/hugetlb_vmemmap.h
> index 779d3cb9333f..65e94436ffff 100644
> --- a/mm/hugetlb_vmemmap.h
> +++ b/mm/hugetlb_vmemmap.h
> @@ -20,6 +20,29 @@ void __init gather_vmemmap_pgtable_init(struct huge_bootmem_page *m,
> void alloc_huge_page_vmemmap(struct hstate *h, struct page *head);
> void free_huge_page_vmemmap(struct hstate *h, struct page *head);
>
> +static inline void subpage_hwpoison_deliver(struct page *head)
> +{
> + struct page *page = head;
> +
> + 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 page *head, struct page *page)
> +{
> + if (PageHWPoison(head))
> + set_page_private(head + 4, page - head);
> +}
> +
> static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h)
> {
> return h->nr_free_vmemmap_pages;
> @@ -56,6 +79,22 @@ static inline void free_huge_page_vmemmap(struct hstate *h, struct page *head)
> {
> }
>
> +static inline void subpage_hwpoison_deliver(struct page *head)
> +{
> +}
> +
> +static inline void set_subpage_hwpoison(struct page *head, struct page *page)
> +{
> + /*
> + * 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);
> + }
> +}
> +
> static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h)
> {
> return 0;
> --
> 2.11.0
>
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-11-20 8:19 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 6:43 [PATCH v5 00/21] Free some vmemmap pages of hugetlb page Muchun Song
2020-11-20 6:43 ` [PATCH v5 01/21] mm/memory_hotplug: Move bootmem info registration API to bootmem_info.c Muchun Song
2020-11-20 6:43 ` [PATCH v5 02/21] mm/memory_hotplug: Move {get,put}_page_bootmem() " Muchun Song
2020-11-20 6:43 ` [PATCH v5 03/21] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Muchun Song
2020-11-20 7:49 ` Michal Hocko
2020-11-20 8:35 ` [External] " Muchun Song
2020-11-20 8:47 ` Michal Hocko
2020-11-20 8:53 ` Muchun Song
2020-11-20 6:43 ` [PATCH v5 04/21] mm/hugetlb: Introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2020-11-20 6:43 ` [PATCH v5 05/21] mm/hugetlb: Introduce pgtable allocation/freeing helpers Muchun Song
2020-11-20 6:43 ` [PATCH v5 06/21] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Muchun Song
2020-11-20 6:43 ` [PATCH v5 07/21] mm/bootmem_info: Combine bootmem info and type into page->freelist Muchun Song
2020-11-20 6:43 ` [PATCH v5 08/21] mm/hugetlb: Initialize page table lock for vmemmap Muchun Song
2020-11-20 6:43 ` [PATCH v5 09/21] mm/hugetlb: Free the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-20 6:43 ` [PATCH v5 10/21] mm/hugetlb: Defer freeing of hugetlb pages Muchun Song
2020-11-20 6:43 ` [PATCH v5 11/21] mm/hugetlb: Allocate the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-20 8:11 ` Michal Hocko
2020-11-20 8:51 ` [External] " Muchun Song
2020-11-20 9:28 ` Michal Hocko
2020-11-20 9:37 ` Muchun Song
2020-11-20 11:10 ` Michal Hocko
2020-11-20 11:56 ` Muchun Song
2020-11-20 6:43 ` [PATCH v5 12/21] mm/hugetlb: Introduce remap_huge_page_pmd_vmemmap helper Muchun Song
2020-11-20 6:43 ` [PATCH v5 13/21] mm/hugetlb: Use PG_slab to indicate split pmd Muchun Song
2020-11-20 8:16 ` Michal Hocko
2020-11-20 9:30 ` [External] " Muchun Song
2020-11-23 7:48 ` Michal Hocko
2020-11-23 8:01 ` Muchun Song
2020-11-20 6:43 ` [PATCH v5 14/21] mm/hugetlb: Support freeing vmemmap pages of gigantic page Muchun Song
2020-11-20 6:43 ` [PATCH v5 15/21] mm/hugetlb: Set the PageHWPoison to the raw error page Muchun Song
2020-11-20 8:19 ` Michal Hocko [this message]
2020-11-20 10:32 ` [External] " Muchun Song
2020-11-20 6:43 ` [PATCH v5 16/21] mm/hugetlb: Flush work when dissolving hugetlb page Muchun Song
2020-11-20 8:20 ` Michal Hocko
2020-11-20 6:43 ` [PATCH v5 17/21] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap Muchun Song
2020-11-20 8:22 ` Michal Hocko
2020-11-20 10:39 ` [External] " Muchun Song
2020-11-20 6:43 ` [PATCH v5 18/21] mm/hugetlb: Merge pte to huge pmd only for gigantic page Muchun Song
2020-11-20 8:23 ` Michal Hocko
2020-11-20 10:41 ` [External] " Muchun Song
2020-11-20 6:43 ` [PATCH v5 19/21] mm/hugetlb: Gather discrete indexes of tail page Muchun Song
2020-11-20 6:43 ` [PATCH v5 20/21] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page Muchun Song
2020-11-20 6:43 ` [PATCH v5 21/21] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two Muchun Song
2020-11-20 8:25 ` Michal Hocko
2020-11-20 9:15 ` David Hildenbrand
2020-11-22 13:30 ` Mike Rapoport
2020-11-22 19:00 ` Matthew Wilcox
2020-11-23 3:14 ` [External] " Muchun Song
2020-11-20 9:16 ` David Hildenbrand
2020-11-20 10:42 ` [External] " Muchun Song
2020-11-20 8:42 ` [PATCH v5 00/21] Free some vmemmap pages of hugetlb page Michal Hocko
2020-11-20 9:27 ` David Hildenbrand
2020-11-20 9:39 ` Michal Hocko
2020-11-20 9:43 ` David Hildenbrand
2020-11-20 17:45 ` Mike Kravetz
2020-11-20 18:00 ` David Hildenbrand
2020-11-22 7:29 ` [External] " Muchun Song
2020-11-23 7:38 ` Michal Hocko
2020-11-23 21:52 ` Mike Kravetz
2020-11-23 22:01 ` Matthew Wilcox
2020-11-20 12:40 ` [External] " Muchun Song
2020-11-20 13:11 ` Michal Hocko
2020-11-20 15:44 ` Muchun Song
2020-11-23 7:40 ` Michal Hocko
2020-11-23 8:53 ` Muchun Song
2020-11-23 9:43 ` Michal Hocko
2020-11-23 10:36 ` Muchun Song
2020-11-23 10:42 ` Michal Hocko
2020-11-23 11:16 ` Muchun Song
2020-11-23 11:32 ` Michal Hocko
2020-11-23 12:07 ` Muchun Song
2020-11-23 12:18 ` Michal Hocko
2020-11-23 12:40 ` Muchun Song
2020-11-23 12:48 ` Michal Hocko
2020-11-23 12:45 ` Matthew Wilcox
2020-11-23 13:05 ` Muchun Song
2020-11-23 13:13 ` Michal Hocko
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