[PATCH 0/9] V2: idle page tracking / working set estimation

[Michel Lespinasse <walken@google.com>]

This is a followup to the prior version of this patchset, which I sent out
on September 16.

I have addressed most of the basic feedback I got so far:

- Renamed struct pr_info -> struct page_referenced_info

- Config option now depends on 64BIT, as we may not have sufficient
  free page flags in 32-bit builds

- Renamed mem -> memcg in kstaled code within memcontrol.c

- Uninlined kstaled_scan_page

- Replaced strict_strtoul -> kstrtoul

- Report PG_stale in /proc/kpageflags

- Fix accounting of THP pages. Sorry for forgeting to do this in the
  V1 patchset - to detail the change here, what I had to do was make sure
  page_referenced() reports THP pages as dirty (as they always are - the
  dirty bit in the pmd is currently meaningless) and update the minimalistic
  implementation change to count THP pages as equivalent to 512 small pages.

- The ugliest parts of patch 6 (rate limit pages scanned per second) have
  been reworked. If the scanning thread gets delayed, it tries to catch up
  so as to minimize jitter. If it can't catch up, it would probably be a
  good idea to increase the scanning interval, but this is left up
  to userspace.

Michel Lespinasse (9):
  page_referenced: replace vm_flags parameter with struct page_referenced_info
  kstaled: documentation and config option.
  kstaled: page_referenced_kstaled() and supporting infrastructure.
  kstaled: minimalistic implementation.
  kstaled: skip non-RAM regions.
  kstaled: rate limit pages scanned per second.
  kstaled: add histogram sampling functionality
  kstaled: add incrementally updating stale page count
  kstaled: export PG_stale in /proc/kpageflags

 Documentation/cgroups/memory.txt  |  103 ++++++++-
 arch/x86/include/asm/page_types.h |    8 +
 arch/x86/kernel/e820.c            |   45 ++++
 fs/proc/page.c                    |    4 +
 include/linux/kernel-page-flags.h |    2 +
 include/linux/ksm.h               |    9 +-
 include/linux/mmzone.h            |   11 +
 include/linux/page-flags.h        |   50 ++++
 include/linux/pagemap.h           |   11 +-
 include/linux/rmap.h              |   82 ++++++-
 mm/Kconfig                        |   10 +
 mm/internal.h                     |    1 +
 mm/ksm.c                          |   15 +-
 mm/memcontrol.c                   |  479 +++++++++++++++++++++++++++++++++++++
 mm/memory_hotplug.c               |    6 +
 mm/mlock.c                        |    1 +
 mm/rmap.c                         |  138 ++++++-----
 mm/swap.c                         |    1 +
 mm/vmscan.c                       |   20 +-
 19 files changed, 899 insertions(+), 97 deletions(-)

-- 
1.7.3.1

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