From: Miaohe Lin <linmiaohe@huawei.com>
To: Naoya Horiguchi <nao.horiguchi@gmail.com>, <linux-mm@kvack.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@redhat.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Liu Shixin <liushixin2@huawei.com>,
Yang Shi <shy828301@gmail.com>,
Oscar Salvador <osalvador@suse.de>,
Muchun Song <songmuchun@bytedance.com>,
Naoya Horiguchi <naoya.horiguchi@nec.com>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 6/9] mm, hwpoison: set PG_hwpoison for busy hugetlb pages
Date: Mon, 27 Jun 2022 16:39:42 +0800 [thread overview]
Message-ID: <d8796bc0-b70b-7300-bc89-093f9d18956f@huawei.com> (raw)
In-Reply-To: <20220623235153.2623702-7-naoya.horiguchi@linux.dev>
On 2022/6/24 7:51, Naoya Horiguchi wrote:
> From: Naoya Horiguchi <naoya.horiguchi@nec.com>
>
> If memory_failure() fails to grab page refcount on a hugetlb page
> because it's busy, it returns without setting PG_hwpoison on it.
> This not only loses a chance of error containment, but breaks the rule
> that action_result() should be called only when memory_failure() do
> any of handling work (even if that's just setting PG_hwpoison).
> This inconsistency could harm code maintainability.
>
> So set PG_hwpoison and call hugetlb_set_page_hwpoison() for such a case.
>
> Fixes: 405ce051236c ("mm/hwpoison: fix race between hugetlb free/demotion and memory_failure_hugetlb()")
> Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Thanks!
> ---
> include/linux/mm.h | 1 +
> mm/memory-failure.c | 8 ++++----
> 2 files changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 4346e51484ba..044dc5a2e361 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -3233,6 +3233,7 @@ enum mf_flags {
> MF_SOFT_OFFLINE = 1 << 3,
> MF_UNPOISON = 1 << 4,
> MF_SW_SIMULATED = 1 << 5,
> + MF_NO_RETRY = 1 << 6,
> };
> extern int memory_failure(unsigned long pfn, int flags);
> extern void memory_failure_queue(unsigned long pfn, int flags);
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 6005e953d011..ce045d0d6115 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1632,7 +1632,8 @@ int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
> count_increased = true;
> } else {
> ret = -EBUSY;
> - goto out;
> + if (!(flags & MF_NO_RETRY))
> + goto out;
> }
>
> if (hugetlb_set_page_hwpoison(head, page)) {
> @@ -1659,7 +1660,6 @@ static int try_memory_failure_hugetlb(unsigned long pfn, int flags, int *hugetlb
> struct page *p = pfn_to_page(pfn);
> struct page *head;
> unsigned long page_flags;
> - bool retry = true;
>
> *hugetlb = 1;
> retry:
> @@ -1675,8 +1675,8 @@ static int try_memory_failure_hugetlb(unsigned long pfn, int flags, int *hugetlb
> }
> return res;
> } else if (res == -EBUSY) {
> - if (retry) {
> - retry = false;
> + if (!(flags & MF_NO_RETRY)) {
> + flags |= MF_NO_RETRY;
> goto retry;
> }
> action_result(pfn, MF_MSG_UNKNOWN, MF_IGNORED);
>
next prev parent reply other threads:[~2022-06-27 8:39 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-23 23:51 [PATCH v2 0/9] mm, hwpoison: enable 1GB hugepage support (v2) Naoya Horiguchi
2022-06-23 23:51 ` [PATCH v2 1/9] mm/hugetlb: remove checking hstate_is_gigantic() in return_unused_surplus_pages() Naoya Horiguchi
2022-06-24 2:25 ` Miaohe Lin
2022-06-24 8:03 ` Muchun Song
2022-06-24 8:15 ` Miaohe Lin
2022-06-24 8:34 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-24 19:11 ` Mike Kravetz
2022-06-27 6:02 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-27 17:25 ` Mike Kravetz
2022-06-28 3:01 ` Miaohe Lin
2022-06-28 8:38 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-30 2:27 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-23 23:51 ` [PATCH v2 2/9] mm/hugetlb: separate path for hwpoison entry in copy_hugetlb_page_range() Naoya Horiguchi
2022-06-24 9:23 ` Miaohe Lin
2022-06-27 6:06 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-24 20:57 ` Mike Kravetz
2022-06-27 6:48 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-27 7:57 ` Muchun Song
2022-06-23 23:51 ` [PATCH v2 3/9] mm/hugetlb: make pud_huge() and huge_pud() aware of non-present pud entry Naoya Horiguchi
2022-06-24 8:40 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-25 0:02 ` Mike Kravetz
2022-06-27 7:07 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-25 9:42 ` Miaohe Lin
2022-06-27 7:24 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-23 23:51 ` [PATCH v2 4/9] mm, hwpoison, hugetlb: support saving mechanism of raw error pages Naoya Horiguchi
2022-06-27 3:16 ` Miaohe Lin
2022-06-27 7:56 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-27 9:26 ` Muchun Song
2022-06-28 2:41 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-28 6:26 ` Muchun Song
2022-06-28 7:51 ` Muchun Song
2022-06-28 8:17 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-28 10:37 ` Muchun Song
2022-06-23 23:51 ` [PATCH v2 5/9] mm, hwpoison: make unpoison aware of raw error info in hwpoisoned hugepage Naoya Horiguchi
2022-06-27 8:32 ` Miaohe Lin
2022-06-27 11:48 ` Miaohe Lin
2022-06-23 23:51 ` [PATCH v2 6/9] mm, hwpoison: set PG_hwpoison for busy hugetlb pages Naoya Horiguchi
2022-06-27 8:39 ` Miaohe Lin [this message]
2022-06-23 23:51 ` [PATCH v2 7/9] mm, hwpoison: make __page_handle_poison returns int Naoya Horiguchi
2022-06-27 9:02 ` Miaohe Lin
2022-06-28 6:02 ` HORIGUCHI NAOYA(堀口 直也)
2022-06-23 23:51 ` [PATCH v2 8/9] mm, hwpoison: skip raw hwpoison page in freeing 1GB hugepage Naoya Horiguchi
2022-06-27 12:24 ` Miaohe Lin
2022-06-23 23:51 ` [PATCH v2 9/9] mm, hwpoison: enable memory error handling on " Naoya Horiguchi
2022-06-28 2:06 ` Miaohe Lin
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