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authorAnshuman Khandual <khandual@linux.vnet.ibm.com>2017-07-10 15:47:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-10 16:32:30 -0700
commitc3114a84f7f96c9d5c73c8bfa7e21ff42fda97e2 (patch)
treedc4ccb50cd7cc3498137147af22c91e23c3d0b61 /mm/migrate.c
parentb37ff71cc626a0c1b5e098ff9a0b723815f6aaeb (diff)
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/migrate.c')
-rw-r--r--mm/migrate.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 051cc1555d36..8935cbe362ce 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1252,6 +1252,8 @@ put_anon:
out:
if (rc != -EAGAIN)
putback_active_hugepage(hpage);
+ if (reason == MR_MEMORY_FAILURE && !test_set_page_hwpoison(hpage))
+ num_poisoned_pages_inc();
/*
* If migration was not successful and there's a freeing callback, use