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unpack-trees: add 'skip_cache_tree_update' option

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Add (disabled by default) option to skip the 'cache_tree_update()' at the
end of 'unpack_trees()'. In many cases, this cache tree update is redundant
because the caller of 'unpack_trees()' immediately follows it with
'prime_cache_tree()', rebuilding the entire cache tree from scratch. While
these operations aren't the most expensive part of operations like 'git
reset', the duplicate calls still create a minor unnecessary slowdown.

Introduce an option for callers to skip the 'cache_tree_update()' in
'unpack_trees()' if it is redundant (that is, if 'prime_cache_tree()' is
called afterwards). At the moment, no 'unpack_trees()' callers use the new
option; they will be updated in subsequent patches.

Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
This commit is contained in:
Victoria Dye
2022-11-10 19:06:02 +00:00
committed by Taylor Blau
parent 94fcf0e852
commit 68fcd48baf
2 changed files with 4 additions and 2 deletions
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3
unpack-trees.h
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@ -71,7 +71,8 @@ struct unpack_trees_options {
quiet,
exiting_early,
show_all_errors,
dry_run;
dry_run,
skip_cache_tree_update;
enum unpack_trees_reset_type reset;
const char *prefix;
int cache_bottom;