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Subject[PATCH v3 0/4] Split page_type out from mapcount
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From: Matthew Wilcox <mawilcox@microsoft.com>

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(-)

--
2.16.1

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