From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 29 Aug 2011 20:34:08 +0000 (-0700)
Subject: diff-index: pass pathspec down to unpack-trees machinery
X-Git-Tag: v1.7.7.1~22^2
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=2f88c19700feb8db8f116f94bf558e61c82d543c;p=git.git

diff-index: pass pathspec down to unpack-trees machinery

And finally, pass the pathspec down through unpack_trees() to traverse_trees()
callchain.

Before and after applying this series, looking for changes in the kernel
repository with a fairly narrow pathspec becomes somewhat faster.

  (without patch)
  $ /usr/bin/time git diff --raw v2.6.27 -- net/ipv6 >/dev/null
  0.48user 0.05system 0:00.53elapsed 100%CPU (0avgtext+0avgdata 163296maxresident)k
  0inputs+952outputs (0major+11163minor)pagefaults 0swaps

  (with patch)
  $ /usr/bin/time git diff --raw v2.6.27 -- net/ipv6 >/dev/null
  0.01user 0.00system 0:00.02elapsed 104%CPU (0avgtext+0avgdata 43856maxresident)k
  0inputs+24outputs (0major+3688minor)pagefaults 0swaps

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/diff-lib.c b/diff-lib.c
index 9c29293bb..12760b422 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -463,6 +463,7 @@ int run_diff_index(struct rev_info *revs, int cached)
 	opts.unpack_data = revs;
 	opts.src_index = &the_index;
 	opts.dst_index = NULL;
+	opts.pathspec = &revs->diffopt.pathspec;
 
 	init_tree_desc(&t, tree->buffer, tree->size);
 	if (unpack_trees(1, &t, &opts))