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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2013-09-11 14:22:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:57:48 -0700
commite2d8cf405525d83e6ca42969be460f94b0339798 (patch)
treebf36312ef5b29802dcca7e0849596a128042b0db /mm/migrate.c
parentb8ec1cee5a4375c1244b85709138a2eac2d89cb6 (diff)
downloadlinux-e2d8cf405525d83e6ca42969be460f94b0339798.tar.bz2
migrate: add hugepage migration code to migrate_pages()
Extend check_range() to handle vma with VM_HUGETLB set. We will be able to migrate hugepage with migrate_pages(2) after applying the enablement patch which comes later in this series. Note that for larger hugepages (covered by pud entries, 1GB for x86_64 for example), we simply skip it now. Note that using pmd_huge/pud_huge assumes that hugepages are pointed to by pmd/pud. This is not true in some architectures implementing hugepage with other mechanisms like ia64, but it's OK because pmd_huge/pud_huge simply return 0 in such arch and page walker simply ignores such hugepages. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: Andi Kleen <ak@linux.intel.com> Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com> Acked-by: Hillf Danton <dhillf@gmail.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Hugh Dickins <hughd@google.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Rik van Riel <riel@redhat.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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