[PATCH v1 0/2] speed up git reset

[Ben Peart <peartben@gmail.com>]

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From: Ben Peart <benpeart@microsoft.com>

The reset (mixed) command unstages the specified file(s) and then shows you
the remaining unstaged changes.  This can make the command slow on larger
repos because at the end it calls refresh_index() which has a single thread
that loops through all the entries calling lstat() for every file.

If the user passes the --quiet switch, reset doesn’t display the remaining
unstaged changes but it still does all the work to find them, it just
doesn’t print them out so passing "--quiet" doesn’t help performance.

This patch series will:

1) change the behavior of "git reset --quiet" so that it no longer computes
   the remaining unstaged changes.
   
2) add a new config setting so that "--quiet" can be configured as the default
   so that the default performance of "git reset" is improved.
   
The performance benefit of this can be significant.  In a repo with 200K files
"git reset foo" performance drops from 7.16 seconds to 0.32 seconds for a
savings of 96%.  Even with the small git repo, reset times drop from 0.191
seconds to 0.043 seconds for a savings of 77%.

Base Ref: master
Web-Diff: https://github.com/benpeart/git/commit/2295a310d0
Checkout: git fetch https://github.com/benpeart/git reset-refresh-index-v1 && git checkout 2295a310d0

Ben Peart (2):
  reset: don't compute unstaged changes after reset when --quiet
  reset: add new reset.quietDefault config setting

 Documentation/config.txt    | 6 ++++++
 Documentation/git-reset.txt | 4 +++-
 builtin/reset.c             | 3 ++-
 3 files changed, 11 insertions(+), 2 deletions(-)


base-commit: a4b8ab5363a32f283a61ef3a962853556d136c0e
-- 
2.18.0.windows.1