Fix "git commit directory/" performance anomaly
This trivial patch avoids re-hashing files that are already clean in the index. This mirrors what commit 0781b8a9 did for "git add .", only for "git commit ." instead. This improves the cold-cache case immensely, since we don't need to bring in all the file contents, just the index and any files dirty in the index. Before: [torvalds@woody linux]$ time git commit . real 1m49.537s user 0m3.892s sys 0m2.432s After: [torvalds@woody linux]$ time git commit . real 0m14.273s user 0m1.312s sys 0m0.516s (both after doing a "echo 3 > /proc/sys/vm/drop_caches" to get cold-cache behaviour - even with the index optimization git still has to "lstat()" all the files, so with a truly cold cache, bringing all the inodes in will take some time). [jc: trivial "return 0;" fixed] Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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