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Re: [PATCH] patch-ids.c: cache patch IDs in a notes tree

From
Junio C Hamano <gitster@pobox.com>
Date
May 12, 2013, 22:19 UTC
Message-ID
<7v1u9bvo1m.fsf@alter.siamese.dyndns.org>
In-Reply-To
<20130512085934.GG2299@serenity.lan>
John Keeping <john@keeping.me.uk> writes:
Show 6 quoted lines
>> But it is not a big problem.  Either 3-way merge notices that there
>> is nothing new, or you get a conflict and have chance to inspect
>> what is going on.
>
> It's not a problem here, but false negatives would be annoying if you're
> looking at "git log --cherry-mark".

The primary thing to notice is that it is not a new problem with or without the caching layer. As Linus mentioned how patch-ids are computed by ignoring offsets and whitespaces, the filtering is done as a crude approximation and false negatives are part of design, so making the cache more complex by recording hash of the binary and/or options used to compute misses the fundamental.

Previous: John KeepingNext: John Keeping
Message 11 of 18 in “patch-ids.c: cache patch IDs in a notes tree”
  1. patch-ids.c: cache patch IDs in a notes treeJohn Keeping, May 11, 2013
  2. Linus TorvaldsMay 11, 2013
  3. John KeepingMay 11, 2013
  4. Linus TorvaldsMay 11, 2013
  5. Johannes SchindelinMay 11, 2013
  6. John KeepingMay 12, 2013
  7. patch-ids: cache patch IDs in a notes treeJohn Keeping, May 12, 2013
  8. John KeepingMay 12, 2013
  9. Junio C HamanoMay 12, 2013
  10. John KeepingMay 12, 2013
  11. Junio C HamanoMay 12, 2013
  12. John KeepingMay 13, 2013
  13. Junio C HamanoMay 13, 2013
  14. John KeepingMay 13, 2013
  15. Junio C HamanoMay 13, 2013
  16. John KeepingMay 13, 2013
  17. Junio C HamanoMay 13, 2013
  18. John KeepingMay 13, 2013

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