everything_local: use "quick" object existence check

In b495697 (fetch-pack: avoid repeatedly re-scanning pack
directory, 2013-01-26), we noticed that everything_local()
could waste time trying to find and parse objects which we
_expect_ to be missing. The solution was to put
has_sha1_file() in front of parse_object() to skip the
more-expensive parse attempt.

That optimization was negated later when has_sha1_file()
learned to do the same re-scan in 45e8a74 (has_sha1_file:
re-check pack directory before giving up, 2013-08-30).

We can restore it by using the "quick" flag to tell
has_sha1_file (actually has_object_file these days) that we
prefer speed to thoroughness for this call.  See also the
fixes in 5827a03 and 0eeb077 for prior art and
discussion on using the "quick" flag for these cases.

The recently-added performance regression test in p5551
demonstrates the problem. You can see the original fix:

  Test            b495697^       b495697
  --------------------------------------------------------
  5551.4: fetch   1.68(1.33+0.35)   0.87(0.69+0.18) -48.2%

and then the regression:

  Test            45e8a74^       45e8a74
  ---------------------------------------------------------
  5551.4: fetch   0.96(0.77+0.19)   2.55(2.04+0.50) +165.6%

and now our fix:

  Test            HEAD^             HEAD
  --------------------------------------------------------
  5551.4: fetch   7.21(6.58+0.63)   5.47(5.04+0.43) -24.1%

You can also see that other things have gotten a lot slower
since 2013. We'll deal with those in separate patches.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

fetch-pack.c

@@ -715,7 +715,8 @@ static int everything_local(struct fetch_pack_args *args,
 	for (ref = *refs; ref; ref = ref->next) {
 		struct object *o;
 
-		if (!has_object_file(&ref->old_oid))
+		if (!has_object_file_with_flags(&ref->old_oid,
+						OBJECT_INFO_QUICK))
 			continue;
 
 		o = parse_object(&ref->old_oid);