linux-kernel - [RFC PATCH v1 0/4] mm, hwpoison: improve handling workload related to hugetlb and memory

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Date:   Wed, 27 Apr 2022 13:28:37 +0900
From:   Naoya Horiguchi <naoya.horiguchi@...ux.dev>
To:     linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        David Hildenbrand <david@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Yang Shi <shy828301@...il.com>,
        Oscar Salvador <osalvador@...e.de>,
        Muchun Song <songmuchun@...edance.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH v1 0/4] mm, hwpoison: improve handling workload related to hugetlb and memory_hotplug

Hi,

This patchset addresses some issues on the workload related to hwpoison,
hugetlb, and memory_hotplug.  The problem in memory hotremove reported by
Miaohe Lin [1] is mentioned in 2/4.  This patch depends on "storing raw
error info" functionality provided by 1/4. This patch also provide delayed
dissolve function too.

Patch 3/4 is to adjust unpoison to new semantics of HPageMigratable for
hwpoisoned hugepage. And 4/4 is the fix for the inconsistent counter issue.

[1] https://lore.kernel.org/linux-mm/20220421135129.19767-1-linmiaohe@huawei.com/

Please let me know if you have any suggestions and comments.

Thanks,
Naoya Horiguchi
---
Summary:

Naoya Horiguchi (4):
      mm, hwpoison, hugetlb: introduce SUBPAGE_INDEX_HWPOISON to save raw error page
      mm,hwpoison,hugetlb,memory_hotplug: hotremove memory section with hwpoisoned hugepage
      mm, hwpoison: add parameter unpoison to get_hwpoison_huge_page()
      mm, memory_hotplug: fix inconsistent num_poisoned_pages on memory hotremove

 include/linux/hugetlb.h | 29 +++++++++++++++++++++++++++--
 mm/hugetlb.c            | 24 ++++++++++++++++++++++--
 mm/memory-failure.c     |  8 ++++++--
 mm/memory_hotplug.c     | 23 +++++++++++------------
 mm/page_alloc.c         |  6 ++++++
 5 files changed, 72 insertions(+), 18 deletions(-)