[CRIU] [PATCHv2 0/9] Implement anonymous shared memory deduplication

[Eugene Batalov]

This patchset implements 3 types of shared memory deduplication:
1. Manual anonymous shared memory image deduplication on criu dedup command.
2. Anonymous shared memory pages autodedup on criu dump command.
   Kernel provided SOFT_DIRTY bits + parent anon shmem image are used.
   As with private anon mem this is enabled using --auto-dedup option.
3. Anonymous shared memory pages autodedup on criu restore command.
   Each restored page is removed from anon shmem dump.
   As with private anon mem this is enabled using --auto-dedup option.

This patchset heavily reuses existing page-read/xfer code
to implement the most of its new features.

=== v0 to v1 changes ===
- Collect separate longest vma sizes for private and shared
  anonymous memory.
- Reset process memory soft dirty bits 'symmetrically' in
  pre_dump_one_task() and dump_one_task().
- Remove 2nd PMC walk. Reuse process VMA loop in
  __parasite_dump_pages_seized().
- Use single page_in_parent() routine (don't use ots copy-paste).

=== v1 to v2 changes ===
- Don't dump not used anon shmem pages.
  Collect and analyze PME_SWAP and PME_PRESENT pagemap bits for this purpose.

Fyodor Bocharov (9):
  vma: rename longest to priv_longest
  proc_parse: collect longest shared vma size
  mem: reset SOFT_DIRTY bits after dumping of all vmas in the process
  shmem: pass anonymous shmem pagemap to add_shmem_area
  shmem: implement used and dirty pages tracking
  page-read/xfer: add ability to open image hierarchy for shmem
  mem: generalize page_in_parent function and make it extern
  shmem: implement anon shared memory dedup on dump
  shmem: implement manual anon shared memory dedup

 cr-dedup.c          |  23 ++-
 cr-dump.c           |  12 +-
 include/mem.h       |   2 +
 include/page-read.h |   4 +-
 include/shmem.h     |   3 +-
 include/vma.h       |   6 +-
 mem.c               |  40 ++--
 page-read.c         |  12 +-
 page-xfer.c         |   5 +-
 proc_parse.c        |  10 +-
 shmem.c             | 117 ++++++++----
 shmem.c.orig        | 513 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 12 files changed, 665 insertions(+), 82 deletions(-)
 create mode 100644 shmem.c.orig

-- 
1.9.1