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mm: hugetlb: soft-offline: dissolve source hugepage after successful migration

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Currently hugepage migrated by soft-offline (i.e.  due to correctable
memory errors) is contained as a hugepage, which means many non-error
pages in it are unreusable, i.e.  wasted.

This patch solves this issue by dissolving source hugepages into buddy.
As done in previous patch, PageHWPoison is set only on a head page of
the error hugepage.  Then in dissoliving we move the PageHWPoison flag
to the raw error page so that all healthy subpages return back to buddy.

[arnd@arndb.de: fix warnings: replace some macros with inline functions]
  Link: http://lkml.kernel.org/r/20170609102544.2947326-1-arnd@arndb.de
Link: http://lkml.kernel.org/r/1496305019-5493-5-git-send-email-n-horiguchi@ah.jp.nec.com
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anshuman Khandual 2017-07-10 15:47:41 -07:00 • committed by Linus Torvalds
parent b37ff71cc6
commit c3114a84f7
4 changed files with 39 additions and 9 deletions
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31
include/linux/hugetlb.h
View file

@ -472,6 +472,7 @@ static inline pgoff_t basepage_index(struct page *page)
return __basepage_index(page);
}
extern int dissolve_free_huge_page(struct page *page);
extern int dissolve_free_huge_pages(unsigned long start_pfn,
unsigned long end_pfn);
static inline bool hugepage_migration_supported(struct hstate *h)
@ -550,15 +551,37 @@ static inline unsigned int pages_per_huge_page(struct hstate *h)
{
return 1;
}
#define hstate_index_to_shift(index) 0
#define hstate_index(h) 0
static inline unsigned hstate_index_to_shift(unsigned index)
{
return 0;
}
static inline int hstate_index(struct hstate *h)
{
return 0;
}
static inline pgoff_t basepage_index(struct page *page)
{
return page->index;
}
#define dissolve_free_huge_pages(s, e) 0
#define hugepage_migration_supported(h) false
static inline int dissolve_free_huge_page(struct page *page)
{
return 0;
}
static inline int dissolve_free_huge_pages(unsigned long start_pfn,
unsigned long end_pfn)
{
return 0;
}
static inline bool hugepage_migration_supported(struct hstate *h)
{
return false;
}
static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
struct mm_struct *mm, pte_t *pte)