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unpack-trees: add 'skip_cache_tree_update' option 

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.c
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@ -2043,7 +2043,8 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
if (!ret) {
if (git_env_bool("GIT_TEST_CHECK_CACHE_TREE", 0))
cache_tree_verify(the_repository, &o->result);
if (!cache_tree_fully_valid(o->result.cache_tree))
if (!o->skip_cache_tree_update &&
!cache_tree_fully_valid(o->result.cache_tree))
cache_tree_update(&o->result,
WRITE_TREE_SILENT |
WRITE_TREE_REPAIR);

3
unpack-trees.h
View File

@ -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;