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Merge branch 'fscache-and-sparse-checkout'

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When updating the skip-worktree bits in the index to align with new
values in a sparse-checkout file, Git scans the entire working
directory with lstat() calls. In a sparse-checkout, many of these
lstat() calls are for paths that do not exist.

Enable the fscache feature during this scan.

In a local test of a repo with ~2.2 million paths, updating the index
with `git read-tree -m -u HEAD` with a sparse-checkout file containing
only `/.gitattributes` improved from 2-3 minutes to 15-20 seconds.

More work could be done to stop running lstat() calls when recursing
into directories that are known to not exist.
This commit is contained in:
Derrick Stolee
2019-06-18 10:05:16 -04:00
committed by Johannes Schindelin
parent 1a9aaf4220 5adc96f041
commit 77239a9b43
1 changed files with 2 additions and 0 deletions
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unpack-trees.c
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@@ -1564,7 +1564,9 @@ static void mark_new_skip_worktree(struct pattern_list *pl,
* 2. Widen worktree according to sparse-checkout file.
* Matched entries will have skip_wt_flag cleared (i.e. "in")
*/
enable_fscache(istate->cache_nr);
clear_ce_flags(istate, select_flag, skip_wt_flag, pl, show_progress);
disable_fscache();
}
static void populate_from_existing_patterns(struct unpack_trees_options *o,