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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