Article: Haswell TM Alternatives

Article: Haswell Transactional Memory Alternatives
By: Doug S (foo.delete@this.bar.bar), August 24, 2012 9:34 am
Room: Moderated Discussions
Linus Torvalds (torvalds.delete@this.linux-foundation.org) on August 22, 2012 10:16 am wrote:
> This is
> one of the reasons why I was arguing so strongly at one point (both here and to
> some Intel engineers) for the transaction model to use "success prediction"
> (possibly actually re-using the branch prediction hardware, but possibly with a
> separate predictor). Because part of "really cheap failure modes" is to not even
> bother trying if it's unlikely to work.


Wouldn't you want a combination of both hardware and software as the ideal? Same thing as the hints to branch prediction used in Linux - "if (unlikely(condition)) ..." There will be some transactions with little contention you feel would almost never fail, and vice versa.
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TopicPosted ByDate
Article: Haswell TM AlternativesDavid Kanter2012/08/21 10:17 PM
  Article: Haswell TM AlternativesHåkan Winbom2012/08/22 12:52 AM
    Article: Haswell TM AlternativesDavid Kanter2012/08/22 02:06 AM
  Article: Haswell TM Alternativesanon2012/08/22 09:46 AM
    Article: Haswell TM AlternativesLinus Torvalds2012/08/22 10:16 AM
      Article: Haswell TM AlternativesDoug S2012/08/24 09:34 AM
    AMD's ASF even more limitedPaul A. Clayton2012/08/22 10:20 AM
      AMD's ASF even more limitedLinus Torvalds2012/08/22 10:41 AM
        Compiler use of ll/sc?Paul A. Clayton2012/08/28 10:28 AM
          Compiler use of ll/sc?Linus Torvalds2012/09/08 01:58 PM
            Lock recognition?Paul A. Clayton2012/09/10 02:17 PM
              Sorry, I was confusedPaul A. Clayton2012/09/13 11:56 AM
  Filter to detect store conflictsPaul A. Clayton2012/08/22 10:19 AM
  Article: Haswell TM Alternativesbakaneko2012/08/22 03:02 PM
    Article: Haswell TM AlternativesDavid Kanter2012/08/22 03:45 PM
      Article: Haswell TM Alternativesbakaneko2012/08/22 10:56 PM
  Cache line granularity?Paul A. Clayton2012/08/28 10:28 AM
    Cache line granularity?David Kanter2012/08/31 09:13 AM
      A looser definition might have advantagesPaul A. Clayton2012/09/01 07:29 AM
    Cache line granularity?rwessel2012/08/31 08:54 PM
      Alpha load locked granularityPaul A. Clayton2012/09/01 07:29 AM
        Alpha load locked granularityanon2012/09/02 06:23 PM
          Alpha pages groupsPaul A. Clayton2012/09/03 05:16 AM
  An alternative implementationMaynard Handley2012/11/20 10:52 PM
    An alternative implementationbakaneko2012/11/21 06:52 AM
      Guarding unread values?Paul A. Clayton2012/11/21 09:39 AM
        Guarding unread values?bakaneko2012/11/21 12:25 PM
    TM granularity and versioningPaul A. Clayton2012/11/21 09:27 AM
      TM granularity and versioningMaynard Handley2012/11/21 11:52 AM
        Indeed, TM (and coherence) has devilish details (NT)Paul A. Clayton2012/11/21 11:56 AM
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