From: Matthew Wilcox <mawil...@microsoft.com>

This patch set changes how we use the _mapcount field in struct page
so that we can store an extra 20+ bits of information about why the
page was allocated.  We expose that information to userspace through
/proc/kpageflags to help diagnose memory usage.  It can also help
debugging if we know what a page was most recently allocated for.

Changes since v4:
 - Added Kirill's acks
 - Fixed spelling (Kirill)
 - Allow a few extra bits to be used in page_type.

Matthew Wilcox (4):
  s390: Use _refcount for pgtables
  mm: Split page_type out from _mapcount
  mm: Mark pages allocated through vmalloc
  mm: Mark pages in use for page tables

 arch/s390/mm/pgalloc.c                 | 21 +++++++------
 arch/tile/mm/pgtable.c                 |  3 ++
 fs/proc/page.c                         |  4 +++
 include/linux/mm.h                     |  2 ++
 include/linux/mm_types.h               | 13 +++++---
 include/linux/page-flags.h             | 57 ++++++++++++++++++++++------------
 include/uapi/linux/kernel-page-flags.h |  3 +-
 kernel/crash_core.c                    |  1 +
 mm/page_alloc.c                        | 13 +++-----
 mm/vmalloc.c                           |  2 ++
 scripts/tags.sh                        |  6 ++--
 tools/vm/page-types.c                  |  2 ++
 12 files changed, 82 insertions(+), 45 deletions(-)

-- 
2.16.1

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