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

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
Show Stats 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;
}

6
include/linux/mm.h
View File

@ -3277,9 +3277,11 @@ extern void shake_page(struct page *p);
extern atomic_long_t num_poisoned_pages __read_mostly;
extern int soft_offline_page(unsigned long pfn, int flags);
#ifdef CONFIG_MEMORY_FAILURE
extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags);
extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags,
bool *migratable_cleared);
#else
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;
}

9
mm/hugetlb.c
View File

@ -7265,7 +7265,7 @@ unlock:
return ret;
}
int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
int get_hwpoison_huge_page(struct page *page, bool *hugetlb, bool unpoison)
{
int ret = 0;
@ -7275,7 +7275,7 @@ int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
*hugetlb = true;
if (HPageFreed(page))
ret = 0;
else if (HPageMigratable(page))
else if (HPageMigratable(page) || unpoison)
ret = get_page_unless_zero(page);
else
ret = -EBUSY;
@ -7284,12 +7284,13 @@ int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
return ret;
}
int get_huge_page_for_hwpoison(unsigned long pfn, int flags)
int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
bool *migratable_cleared)
{
int ret;
spin_lock_irq(&hugetlb_lock);
ret = __get_huge_page_for_hwpoison(pfn, flags);
ret = __get_huge_page_for_hwpoison(pfn, flags, migratable_cleared);
spin_unlock_irq(&hugetlb_lock);
return ret;
}

21
mm/memory-failure.c
View File

@ -1244,7 +1244,7 @@ static int __get_hwpoison_page(struct page *page, unsigned long flags)
int ret = 0;
bool hugetlb = false;
ret = get_hwpoison_huge_page(head, &hugetlb);
ret = get_hwpoison_huge_page(head, &hugetlb, false);
if (hugetlb)
return ret;
@ -1334,7 +1334,7 @@ static int __get_unpoison_page(struct page *page)
int ret = 0;
bool hugetlb = false;
ret = get_hwpoison_huge_page(head, &hugetlb);
ret = get_hwpoison_huge_page(head, &hugetlb, true);
if (hugetlb)
return ret;
@ -1785,7 +1785,8 @@ void hugetlb_clear_page_hwpoison(struct page *hpage)
* -EBUSY - the hugepage is busy (try to retry)
* -EHWPOISON - the hugepage is already hwpoisoned
*/
int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
int __get_huge_page_for_hwpoison(unsigned long pfn, int flags,
bool *migratable_cleared)
{
struct page *page = pfn_to_page(pfn);
struct page *head = compound_head(page);
@ -1815,6 +1816,15 @@ int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
goto out;
}
/*
* Clearing HPageMigratable for hwpoisoned hugepages to prevent them
* from being migrated by memory hotremove.
*/
if (count_increased && HPageMigratable(head)) {
ClearHPageMigratable(head);
*migratable_cleared = true;
}
return ret;
out:
if (count_increased)
@ -1834,10 +1844,11 @@ 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 migratable_cleared = false;
*hugetlb = 1;
retry:
res = get_huge_page_for_hwpoison(pfn, flags);
res = get_huge_page_for_hwpoison(pfn, flags, &migratable_cleared);
if (res == 2) { /* fallback to normal page handling */
*hugetlb = 0;
return 0;
@ -1861,6 +1872,8 @@ retry:
if (hwpoison_filter(p)) {
hugetlb_clear_page_hwpoison(head);
if (migratable_cleared)
SetHPageMigratable(head);
unlock_page(head);
if (res == 1)
put_page(head);