16 Jan, 2016

2 commits

• f627c2f53   memcg: adjust to support new THP refcounting ... Browse Code »

  As with rmap, with new refcounting we cannot rely on PageTransHuge() to
  check if we need to charge size of huge page form the cgroup. We need
  to get information from caller to know whether it was mapped with PMD or
  PTE.

  We do uncharge when last reference on the page gone. At that point if
  we see PageTransHuge() it means we need to unchange whole huge page.

  The tricky part is partial unmap -- when we try to unmap part of huge
  page. We don't do a special handing of this situation, meaning we don't
  uncharge the part of huge page unless last user is gone or
  split_huge_page() is triggered. In case of cgroup memory pressure
  happens the partial unmapped page will be split through shrinker. This
  should be good enough.

  Signed-off-by: Kirill A. Shutemov
  Tested-by: Sasha Levin
  Tested-by: Aneesh Kumar K.V
  Acked-by: Vlastimil Babka
  Acked-by: Jerome Marchand
  Cc: Andrea Arcangeli
  Cc: Hugh Dickins
  Cc: Dave Hansen
  Cc: Mel Gorman
  Cc: Rik van Riel
  Cc: Naoya Horiguchi
  Cc: Steve Capper
  Cc: Johannes Weiner
  Cc: Michal Hocko
  Cc: Christoph Lameter
  Cc: David Rientjes
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Kirill A. Shutemov

  2016-01-16 09:56:32 +0800  
• d281ee614   rmap: add argument to charge compound page ... Browse Code »

  We're going to allow mapping of individual 4k pages of THP compound
  page. It means we cannot rely on PageTransHuge() check to decide if
  map/unmap small page or THP.

  The patch adds new argument to rmap functions to indicate whether we
  want to operate on whole compound page or only the small page.

  [n-horiguchi@ah.jp.nec.com: fix mapcount mismatch in hugepage migration]
  Signed-off-by: Kirill A. Shutemov
  Tested-by: Sasha Levin
  Tested-by: Aneesh Kumar K.V
  Acked-by: Vlastimil Babka
  Acked-by: Jerome Marchand
  Cc: Andrea Arcangeli
  Cc: Hugh Dickins
  Cc: Dave Hansen
  Cc: Mel Gorman
  Cc: Rik van Riel
  Cc: Steve Capper
  Cc: Johannes Weiner
  Cc: Michal Hocko
  Cc: Christoph Lameter
  Cc: David Rientjes
  Signed-off-by: Naoya Horiguchi
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Kirill A. Shutemov

  2016-01-16 09:56:32 +0800  

05 Sep, 2015

2 commits

• b6ebaedb4   userfaultfd: avoid mmap_sem read recursion in mcopy_atomic ... Browse Code »

  If the rwsem starves writers it wasn't strictly a bug but lockdep
  doesn't like it and this avoids depending on lowlevel implementation
  details of the lock.

  [akpm@linux-foundation.org: delete weird BUILD_BUG_ON()]
  Signed-off-by: Andrea Arcangeli
  Acked-by: Pavel Emelyanov
  Cc: Sanidhya Kashyap
  Cc: zhang.zhanghailiang@huawei.com
  Cc: "Kirill A. Shutemov"
  Cc: Andres Lagar-Cavilla
  Cc: Dave Hansen
  Cc: Paolo Bonzini
  Cc: Rik van Riel
  Cc: Mel Gorman
  Cc: Andy Lutomirski
  Cc: Hugh Dickins
  Cc: Peter Feiner
  Cc: "Dr. David Alan Gilbert"
  Cc: Johannes Weiner
  Cc: "Huangpeng (Peter)"
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Andrea Arcangeli

  2015-09-05 07:54:41 +0800  
• c1a4de99f   userfaultfd: mcopy_atomic|mfill_zeropage: UFFDIO_COPY|UFFDIO_ZEROPAGE preparation ... Browse Code »

  This implements mcopy_atomic and mfill_zeropage that are the lowlevel
  VM methods that are invoked respectively by the UFFDIO_COPY and
  UFFDIO_ZEROPAGE userfaultfd commands.

  Signed-off-by: Andrea Arcangeli
  Acked-by: Pavel Emelyanov
  Cc: Sanidhya Kashyap
  Cc: zhang.zhanghailiang@huawei.com
  Cc: "Kirill A. Shutemov"
  Cc: Andres Lagar-Cavilla
  Cc: Dave Hansen
  Cc: Paolo Bonzini
  Cc: Rik van Riel
  Cc: Mel Gorman
  Cc: Andy Lutomirski
  Cc: Hugh Dickins
  Cc: Peter Feiner
  Cc: "Dr. David Alan Gilbert"
  Cc: Johannes Weiner
  Cc: "Huangpeng (Peter)"
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Andrea Arcangeli

  2015-09-05 07:54:41 +0800