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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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5
mm/memory-failure.c
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@@ -1575,11 +1575,8 @@ static int soft_offline_huge_page(struct page *page, int flags)
if (ret > 0)
ret = -EIO;
} else {
/* overcommit hugetlb page will be freed to buddy */
SetPageHWPoison(page);
if (PageHuge(page))
dequeue_hwpoisoned_huge_page(hpage);
num_poisoned_pages_inc();
dissolve_free_huge_page(page);
}
return ret;
}