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| author | Anshuman Khandual <khandual@linux.vnet.ibm.com> | 2017-07-10 15:47:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-10 16:32:30 -0700 |
| commit | c3114a84f7f96c9d5c73c8bfa7e21ff42fda97e2 (patch) | |
| tree | dc4ccb50cd7cc3498137147af22c91e23c3d0b61 /mm/hugetlb.c | |
| parent | b37ff71cc626a0c1b5e098ff9a0b723815f6aaeb (diff) | |
| download | linux-c3114a84f7f96c9d5c73c8bfa7e21ff42fda97e2.tar.bz2 | |
mm: hugetlb: soft-offline: dissolve source hugepage after successful migration
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>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 41a1b48cefbf..b2d44363837a 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1459,7 +1459,7 @@ static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed, * number of free hugepages would be reduced below the number of reserved * hugepages. */ -static int dissolve_free_huge_page(struct page *page) +int dissolve_free_huge_page(struct page *page) { int rc = 0; @@ -1472,6 +1472,14 @@ static int dissolve_free_huge_page(struct page *page) rc = -EBUSY; goto out; } + /* + * Move PageHWPoison flag from head page to the raw error page, + * which makes any subpages rather than the error page reusable. + */ + if (PageHWPoison(head) && page != head) { + SetPageHWPoison(page); + ClearPageHWPoison(head); + } list_del(&head->lru); h->free_huge_pages--; h->free_huge_pages_node[nid]--; |