[PATCH v3 0/4] Split page_type out from mapcount

[Matthew Wilcox]

From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>

I want to use the _mapcount field to record what a page is in use as.
This can help with debugging and we can also expose that information to
userspace through /proc/kpageflags to help diagnose memory usage (not
included as part of this patch set).

First, we need s390 to stop using _mapcount for its own purposes;
Martin, I hope you have time to look at this patch.  I must confess I
don't quite understand what the different bits are used for in the upper
nybble of the _mapcount, but I tried to replicate what you were doing
faithfully.

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

 arch/s390/mm/pgalloc.c     | 21 +++++++++--------
 fs/proc/page.c             |  2 +-
 include/linux/mm.h         |  2 ++
 include/linux/mm_types.h   | 13 +++++++----
 include/linux/page-flags.h | 57 ++++++++++++++++++++++++++++++----------------
 kernel/crash_core.c        |  1 +
 mm/page_alloc.c            | 13 ++++-------
 mm/vmalloc.c               |  2 ++
 scripts/tags.sh            |  6 ++---
 9 files changed, 72 insertions(+), 45 deletions(-)

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2.16.1