Re: [PATCH v9 00/16] Sparse-index: integrate with status

On Wed, Jul 14, 2021 at 6:12 AM Derrick Stolee via GitGitGadget
[off-list ref] wrote:

This is the first "payoff" series in the sparse-index work. It makes 'git
status' very fast when a sparse-index is enabled on a repository with
cone-mode sparse-checkout (and a small populated set).

This is based on ds/sparse-index-protections AND mt/add-rm-sparse-checkout.
The latter branch is needed because it changes the behavior of 'git add'
around sparse entries, which changes the expectations of a test added in
patch 1.

The approach here is to audit the places where ensure_full_index() pops up
while doing normal commands with pathspecs within the sparse-checkout
definition. Each of these are checked and tested. In the end, the
sparse-index is integrated with these features:

 * git status
 * FS Monitor index extension.

The performance tests in p2000-sparse-operations.sh improve by 95% or more,
even when compared with the full-index cases, not just the sparse-index
cases that previously had extra overhead.

Hopefully this is the first example of how ds/sparse-index-protections has
done the basic work to do these conversions safely, making them look easier
than they seemed when starting this adventure.

Thanks, -Stolee


Update in V9
============

 * Fixed typo.

 * All patches are marked as Reviewed-by Elijah. Thanks for the careful
   review!

Thanks for all the hard work and pushing this feature forward!