mm/balloon_compaction: fixes and cleanups

Here is reworked and resplitted patchset. patches agains current mmotm. I've merged fixes into first patch. It appyies clearly to v3.16, older kernels has a trivial conflict in mm/migrate.c.

Reference counting during isolation and migration of ballooned pages reorganized and now looks similar to scheme used for normal pages (grab extra reference, isolate, migrate, putback/drop extra reference).

Changes since v2:

* PagePrivate used for fixing race between isolation and deflation
* all fixes merged into first patch

second patch contains only cleanup
third patch adds new interfaces (vmstat, kpageflags)
transhuge-stress: no changes except commit message

bloat-o-meter (x86_64, defconfig + balloon-compaction):

add/remove: 0/7 grow/shrink: 7/9 up/down: 134/-1045 (-911)

function                                     old     new   delta
virtballoon_migratepage                      322     357     +35
vmstat_text                                  824     848     +24
vm_event_states                              496     520     +24
stable_page_flags                            378     401     +23
balloon_page_enqueue                         138     154     +16
balloon_page_migrate                         162     168      +6
balloon_page_dequeue                         287     293      +6
leak_balloon                                 254     246      -8
balloon_page_putback                         205     193     -12
__ksymtab_balloon_mapping_alloc               16       -     -16
__ksymtab_balloon_devinfo_alloc               16       -     -16
virtballoon_remove                            70      48     -22
__kstrtab_balloon_mapping_alloc               22       -     -22
__kstrtab_balloon_devinfo_alloc               22       -     -22
balloon_page_isolate                         291     243     -48
virtballoon_probe                            382     318     -64
balloon_devinfo_alloc                         96       -     -96
isolate_migratepages_block                  1682    1578    -104
reclaim_clean_pages_from_list                435     330    -105
putback_movable_pages                        312     207    -105
migrate_pages                               1992    1875    -117
balloon_mapping_alloc                        128       -    -128
virtio_balloon_aops                          160       -    -160

even allnoconfig is smaller now:

add/remove: 0/3 grow/shrink: 0/0 up/down: 0/-291 (-291)
function old new delta

balloon_devinfo_alloc                         63       -     -63
balloon_page_enqueue                          82       -     -82
balloon_page_dequeue                         146       -    -146

---

Konstantin Khlebnikov (4):
mm/balloon_compaction: redesign ballooned pages management mm/balloon_compaction: remove balloon mapping and flag AS_BALLOON_MAP mm/balloon_compaction: add vmstat counters and kpageflags bit selftests/vm/transhuge-stress: stress test for memory compaction

 drivers/virtio/Kconfig                        |    1 
 drivers/virtio/virtio_balloon.c               |   76 +++--------
 fs/proc/page.c                                |    3 
 include/linux/balloon_compaction.h            |  169 +++++++------------------
 include/linux/migrate.h                       |   11 --
 include/linux/mm.h                            |   19 +++
 include/linux/pagemap.h                       |   18 ---
 include/linux/vm_event_item.h                 |    7 +
 include/uapi/linux/kernel-page-flags.h        |    1 
 mm/Kconfig                                    |    7 +
 mm/Makefile                                   |    3 
 mm/balloon_compaction.c                       |  123 +++---------------
 mm/compaction.c                               |    2 
 mm/migrate.c                                  |   16 +-
 mm/vmstat.c                                   |   12 ++
 tools/testing/selftests/vm/Makefile           |    1 
 tools/testing/selftests/vm/transhuge-stress.c |  144 +++++++++++++++++++++
 tools/vm/page-types.c                         |    1 
 18 files changed, 288 insertions(+), 326 deletions(-)
 create mode 100644 tools/testing/selftests/vm/transhuge-stress.c

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