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treewide: rename tree to maybe_tree

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Using the commit-graph file to walk commit history removes the large
cost of parsing commits during the walk. This exposes a performance
issue: lookup_tree() takes a large portion of the computation time,
even when Git never uses those trees.

In anticipation of lazy-loading these trees, rename the 'tree' member
of struct commit to 'maybe_tree'. This serves two purposes: it hints
at the future role of possibly being NULL even if the commit has a
valid tree, and it allows for unambiguous transformation from simple
member access (i.e. commit->maybe_tree) to method access.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2018-04-06 19:09:32 +00:00
committed by Junio C Hamano
parent 2d5792f071
commit 891435d55d
24 changed files with 65 additions and 64 deletions
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http-push.c
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@ -1330,7 +1330,7 @@ static int get_delta(struct rev_info *revs, struct remote_lock *lock)
int count = 0;
while ((commit = get_revision(revs)) != NULL) {
p = process_tree(commit->tree, p);
p = process_tree(commit->maybe_tree, p);
commit->object.flags |= LOCAL;
if (!(commit->object.flags & UNINTERESTING))
count += add_send_request(&commit->object, lock);