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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-01-15 16:54:14 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-15 17:56:32 -0800 |
| commit | 248db92da13f25073e7ebbd5fb95615aafd771d1 (patch) | |
| tree | 8ac8d4616a89c2c88ce23ef448429ad61b508ff3 /mm/mempolicy.c | |
| parent | e9b61f19858a5d6c42ce2298cf138279375d0d9b (diff) | |
| download | linux-248db92da13f25073e7ebbd5fb95615aafd771d1.tar.bz2 | |
migrate_pages: try to split pages on queuing
We are not able to migrate THPs. It means it's not enough to split only
PMD on migration -- we need to split compound page under it too.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 5f7f9dace354..973434eff9dc 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -489,14 +489,33 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr, struct page *page; struct queue_pages *qp = walk->private; unsigned long flags = qp->flags; - int nid; + int nid, ret; pte_t *pte; spinlock_t *ptl; - split_huge_pmd(vma, pmd, addr); - if (pmd_trans_unstable(pmd)) - return 0; + if (pmd_trans_huge(*pmd)) { + ptl = pmd_lock(walk->mm, pmd); + if (pmd_trans_huge(*pmd)) { + page = pmd_page(*pmd); + if (is_huge_zero_page(page)) { + spin_unlock(ptl); + split_huge_pmd(vma, pmd, addr); + } else { + get_page(page); + spin_unlock(ptl); + lock_page(page); + ret = split_huge_page(page); + unlock_page(page); + put_page(page); + if (ret) + return 0; + } + } else { + spin_unlock(ptl); + } + } +retry: pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) { if (!pte_present(*pte)) @@ -513,6 +532,21 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr, nid = page_to_nid(page); if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT)) continue; + if (PageTail(page) && PageAnon(page)) { + get_page(page); + pte_unmap_unlock(pte, ptl); + lock_page(page); + ret = split_huge_page(page); + unlock_page(page); + put_page(page); + /* Failed to split -- skip. */ + if (ret) { + pte = pte_offset_map_lock(walk->mm, pmd, + addr, &ptl); + continue; + } + goto retry; + } if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) migrate_page_add(page, qp->pagelist, flags); |