[PATCH v5 00/15] index-helper/watchman

This version includes the following changes since v4:
1. The last patch has been removed; it's pretty much always a good
idea to wait for the index-helper

2. Documentation for index-helper --kill and --autorun.  Documentation
for update-index --watchman.  Documentation for index-format for WAMA.
Documentation for index-helper suggesting running update-index --watchman.

3. index-helper autorun moved to read-cache so it's only run on relevant
commands.

4. Tests: Broken && chain fixed; removed a subshell

5. A couple of fd leaks fixed.

6. Cruft removed.

7. New perf numbers.

David Turner (5):
  unpack-trees: preserve index extensions
  index-helper: kill mode
  index-helper: don't run if already running
  index-helper: autorun mode
  index-helper: optionally automatically run

Nguyễn Thái Ngọc Duy (10):
  read-cache.c: fix constness of verify_hdr()
  read-cache: allow to keep mmap'd memory after reading
  index-helper: new daemon for caching index and related stuff
  index-helper: add --strict
  daemonize(): set a flag before exiting the main process
  index-helper: add --detach
  read-cache: add watchman 'WAMA' extension
  Add watchman support to reduce index refresh cost
  index-helper: use watchman to avoid refreshing index with lstat()
  update-index: enable/disable watchman support

 .gitignore                               |   1 +
 Documentation/config.txt                 |   4 +
 Documentation/git-index-helper.txt       |  75 +++++
 Documentation/git-update-index.txt       |   6 +
 Documentation/technical/index-format.txt |  22 ++
 Makefile                                 |  17 ++
 builtin/gc.c                             |   2 +-
 builtin/update-index.c                   |  11 +
 cache.h                                  |  16 +-
 config.c                                 |   5 +
 configure.ac                             |   8 +
 daemon.c                                 |   2 +-
 dir.c                                    |  23 +-
 dir.h                                    |   6 +
 environment.c                            |   3 +
 git-compat-util.h                        |   1 +
 index-helper.c                           | 454 ++++++++++++++++++++++++++++
 read-cache.c                             | 488 ++++++++++++++++++++++++++++++-
 setup.c                                  |   4 +-
 t/t7063-status-untracked-cache.sh        |  22 ++
 t/t7900-index-helper.sh                  |  68 +++++
 t/test-lib-functions.sh                  |   4 +
 unpack-trees.c                           |   1 +
 watchman-support.c                       | 135 +++++++++
 watchman-support.h                       |   7 +
 25 files changed, 1364 insertions(+), 21 deletions(-)
 create mode 100644 Documentation/git-index-helper.txt
 create mode 100644 index-helper.c
 create mode 100755 t/t7900-index-helper.sh
 create mode 100644 watchman-support.c
 create mode 100644 watchman-support.h