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show-branch: Fix another performance problem.

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When naming commits, stop walking the parent chain as soon as we find
a commit that already has a name. The parent chain of that commit will
be walked later on in any case (or may even have been walked already).
This avoids O(n^2) behavior; on a tree where show-branch displays 6800
commits, the total run time drops from 77 seconds to 5 seconds.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Alexandre Julliard 2006-07-23 19:51:04 +02:00 committed by Junio C Hamano
parent 4812a93a8c
commit f8263c5339
1 changed files with 2 additions and 0 deletions
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2
builtin-show-branch.c
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@ -89,6 +89,8 @@ static int name_first_parent_chain(struct commit *c)
name_parent(c, p);
i++;
}
else
break;
c = p;
}
return i;