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Re: [PATCH 05/17] Do not check the same match_pos twice

From
Jeff King <peff@peff.net>
Date
Aug 23, 2012, 08:42 UTC
Message-ID
<20120823084213.GC6963@sigill.intra.peff.net>
In-Reply-To
<1345709442-16046-6-git-send-email-mhagger@alum.mit.edu>
On Thu, Aug 23, 2012 at 10:10:30AM +0200, mhagger@alum.mit.edu wrote:
Show 5 quoted lines
> From: Michael Haggerty <mhagger@alum.mit.edu>
> 
> Once a match has been found at match_pos, the entry is zeroed and no
> future attempts will match that entry.  So increment match_pos to
> avoid checking against the zeroed-out entry during the next iteration.
Good catch.

A subtle side effect of this zero-ing (not introduced by your patch, but something I noticed while re-reading the code) is that we implicitly eliminate duplicate entries from the list of remote refs. There shouldn't generally be any duplicates, of course, but I think skipping them is probably sane.

-Peff
Previous: mhagger@alum.mit.eduNext: mhagger@alum.mit.edu
Message 14 of 40 in “Clean up how fetch_pack() handles the heads list”
  1. 00/17 Clean up how fetch_pack() handles the heads listmhagger@alum.mit.edu, Aug 23, 2012
  2. 01/17 t5500: add tests of error output for missing refsmhagger@alum.mit.edu, Aug 23, 2012
  3. 02/17 Rename static function fetch_pack() to http_fetch_pack()mhagger@alum.mit.edu, Aug 23, 2012
  4. 03/17 Fix formatting.mhagger@alum.mit.edu, Aug 23, 2012
  5. 04/17 Name local variables more consistentlymhagger@alum.mit.edu, Aug 23, 2012
  6. Jeff KingAug 23, 2012
  7. Michael HaggertyAug 24, 2012
  8. Junio C HamanoAug 26, 2012
  9. Michael HaggertyAug 27, 2012
  10. Jeff KingAug 27, 2012
  11. Junio C HamanoAug 27, 2012
  12. Junio C HamanoAug 27, 2012
  13. 05/17 Do not check the same match_pos twicemhagger@alum.mit.edu, Aug 23, 2012
  14. Jeff KingAug 23, 2012
  15. 06/17 Let fetch_pack() inform caller about number of unique headsmhagger@alum.mit.edu, Aug 23, 2012
  16. Jeff KingAug 23, 2012
  17. Michael HaggertyAug 25, 2012
  18. 07/17 Pass nr_heads to do_pack_ref() by referencemhagger@alum.mit.edu, Aug 23, 2012
  19. 08/17 Pass nr_heads to everything_local() by referencemhagger@alum.mit.edu, Aug 23, 2012
  20. 09/17 Pass nr_heads to filter_refs() by referencemhagger@alum.mit.edu, Aug 23, 2012
  21. 10/17 Remove ineffective optimizationmhagger@alum.mit.edu, Aug 23, 2012
  22. 11/17 filter_refs(): do not leave gaps in return_refsmhagger@alum.mit.edu, Aug 23, 2012
  23. 12/17 filter_refs(): compress unmatched refs in heads arraymhagger@alum.mit.edu, Aug 23, 2012
  24. 13/17 cmd_fetch_pack: return early if finish_connect() returns an errormhagger@alum.mit.edu, Aug 23, 2012
  25. 14/17 Report missing refs even if no existing refs were receivedmhagger@alum.mit.edu, Aug 23, 2012
  26. 15/17 cmd_fetch_pack(): simplify computation of return valuemhagger@alum.mit.edu, Aug 23, 2012
  27. 16/17 fetch_pack(): free matching headsmhagger@alum.mit.edu, Aug 23, 2012
  28. Jeff KingAug 23, 2012
  29. 17/17 fetch_refs(): simplify logicmhagger@alum.mit.edu, Aug 23, 2012
  30. Jeff KingAug 23, 2012
  31. Michael HaggertyAug 25, 2012
  32. Jeff KingAug 23, 2012
  33. Philip OakleyAug 23, 2012
  34. Jeff KingAug 23, 2012
  35. Jeff KingAug 23, 2012
  36. Michael HaggertyAug 25, 2012
  37. Michael HaggertySep 2, 2012
  38. Philip OakleyAug 23, 2012
  39. Junio C HamanoAug 24, 2012
  40. Philip OakleyAug 24, 2012

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