[PATCH v4 00/16] index-helper, watchman

This version has been tested on OS X and Linux. It switches from POSIX-Realtime shm to plain old mmap. Thanks to JI for this suggestion.

This version incorporates a couple of fixes from Ramsay Jones.

There might be a couple of minor spelling/grammar fixes too.

David Turner (6):
  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
  read-cache: config for waiting for index-helper

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           |  10 +
 Documentation/git-index-helper.txt |  66 +++++
 Makefile                           |  17 ++
 builtin/gc.c                       |   2 +-
 builtin/update-index.c             |  11 +
 cache.h                            |  23 +-
 config.c                           |  10 +
 configure.ac                       |   8 +
 daemon.c                           |   2 +-
 dir.c                              |  23 +-
 dir.h                              |   6 +
 environment.c                      |   8 +
 git-compat-util.h                  |  18 ++
 git.c                              |  35 ++-
 index-helper.c                     | 534 +++++++++++++++++++++++++++++++++++++
 read-cache.c                       | 520 +++++++++++++++++++++++++++++++++++-
 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 +
 24 files changed, 1513 insertions(+), 22 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