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mm,hwpoison,hugetlb,memory_hotplug: hotremove memory section with hwpoisoned hugepage

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Patch series "mm, hwpoison: improve handling workload related to hugetlb
and memory_hotplug", v7.

This patchset tries to solve the issue among memory_hotplug, hugetlb and hwpoison.
In this patchset, memory hotplug handles hwpoison pages like below:

  - hwpoison pages should not prevent memory hotremove,
  - memory block with hwpoison pages should not be onlined.


This patch (of 4):

HWPoisoned page is not supposed to be accessed once marked, but currently
such accesses can happen during memory hotremove because
do_migrate_range() can be called before dissolve_free_huge_pages() is
called.

Clear HPageMigratable for hwpoisoned hugepages to prevent them from being
migrated.  This should be done in hugetlb_lock to avoid race against
isolate_hugetlb().

get_hwpoison_huge_page() needs to have a flag to show it's called from
unpoison to take refcount of hwpoisoned hugepages, so add it.

[naoya.horiguchi@linux.dev: remove TestClearHPageMigratable and reduce to test and clear separately]
  Link: https://lkml.kernel.org/r/20221025053559.GA2104800@ik1-406-35019.vs.sakura.ne.jp
Link: https://lkml.kernel.org/r/20221024062012.1520887-1-naoya.horiguchi@linux.dev
Link: https://lkml.kernel.org/r/20221024062012.1520887-2-naoya.horiguchi@linux.dev
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Reported-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi 2022-10-24 15:20:09 +09:00 • committed by Andrew Morton
parent fd4a7ac329
commit e591ef7d96
4 changed files with 32 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

10
include/linux/hugetlb.h
View file

@ -183,8 +183,9 @@ bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
long freed);
int isolate_hugetlb(struct page *page, struct list_head *list);
int get_hwpoison_huge_page(struct page *page, bool *hugetlb);
int get_huge_page_for_hwpoison(unsigned long pfn, int flags);
int get_hwpoison_huge_page(struct page *page, bool *hugetlb, bool unpoison);
int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
bool *migratable_cleared);
void putback_active_hugepage(struct page *page);
void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
void free_huge_page(struct page *page);
@ -391,12 +392,13 @@ static inline int isolate_hugetlb(struct page *page, struct list_head *list)
return -EBUSY;
}
static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb, bool unpoison)
{
return 0;
}
static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags)
static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
bool *migratable_cleared)
{
return 0;
}