Guarding unread values?

Article: Haswell Transactional Memory Alternatives
By: bakaneko (nyan.delete@this.hyan.wan), November 21, 2012 12:25 pm
Room: Moderated Discussions
Paul A. Clayton (paaronclayton.delete@this.gmail.com) on November 21, 2012 9:39 am wrote:
> bakaneko (nyan.delete@this.hyan.wan) on November 21, 2012 6:52 am wrote:
> [snip]
> > This way you don't need to add superfluous reads to protect
> > objects which span multiple cachelines, which is as annoying
> > as multiple unrelated objects in one cacheline.
>
> When would one need to guard a value that is not accessed as part of the critical
> section? Is such an artifact of certain languages (e.g., providing object-granular
> locks) or are there cases where such provides a useful guard?

Good question, I just assumed it is, but
yeah, you are right, it's probably something
which happens rarely and not a good idea.

Even as guard, it would just make other
transactions fail more often...
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TopicPosted ByDate
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          Compiler use of ll/sc?Linus Torvalds2012/09/08 01:58 PM
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              Sorry, I was confusedPaul A. Clayton2012/09/13 11:56 AM
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    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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