[PATCH 0/4] pagecache scanning with /proc/kpagecache

[Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>]

This patchset adds a new procfs interface to extrace information about
pagecache status. In-kernel tool tools/vm/page-types.c has already some
code for pagecache scanning without kernel's help, but it's not free
from measurement-disturbance, so here I'm suggesting another approach.

Patch 1/4 changes radix tree API to support ranged iteration as a preparation
for patch 2/4 which adds /proc/kpagecache. Patch 3/4 changes page-types to
use the interface in file scanning mode. Patch 4/4 is documentation update.

This patchset were previously posted as a part of memory error reporting
patchset (http://lwn.net/Articles/590690/), so changelogs in individual
patches are changes from that version.

Thanks,
Naoya Horiguchi
---
Summary:

Naoya Horiguchi (4):
      radix-tree: add end_index to support ranged iteration
      fs/proc/page.c: introduce /proc/kpagecache interface
      tools/vm/page-types.c: rework on file cache scanning mode
      Documentation: update Documentation/vm/pagemap.txt

 Documentation/vm/pagemap.txt  |  29 +++++
 drivers/gpu/drm/qxl/qxl_ttm.c |   2 +-
 fs/proc/page.c                | 105 ++++++++++++++++
 include/linux/fs.h            |   9 +-
 include/linux/radix-tree.h    |  27 +++--
 kernel/irq/irqdomain.c        |   2 +-
 lib/radix-tree.c              |   8 +-
 mm/filemap.c                  |   8 +-
 tools/vm/page-types.c         | 276 +++++++++++++++++-------------------------
 9 files changed, 284 insertions(+), 182 deletions(-)

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