Hardware Transactional Memory, the end?

By: gpd (gpderetta.delete@this.gmail.com), August 26, 2022 3:07 am
Room: Moderated Discussions
Linus Torvalds (torvalds.delete@this.linux-foundation.org) on August 22, 2022 11:32 am wrote:
> --- (---.delete@this.redheron.com) on August 21, 2022 9:33 pm wrote:
> >
> > Just so I understand, Linus, are you saying that
> > (a) You NEED LL4/SC4 for correctness? That is, if you can trust LL4/SC4 to do what's promised, various
> > constructions that today are very messy/finicky/slow can be replaced with something much simpler
>
> No, I most certainly don't "need" it.
>

Around 10 years ago AMD proposed exactly your design: guaranteed forward progress transactions to up to 4 cachelines:
http://developer.amd.com/wordpress/media/2013/09/45432-ASF_Spec_2.1.pdf

In the end of course it was never implemented, and I think the original spec actually guaranteed transactions to up to 7 cachelines as apparently that's enough for a lot of useful lock free algorithms.

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TopicPosted ByDate
Hardware Transactional Memory, the end?rwessel2022/08/20 06:50 PM
  Hardware Transactional Memory, the end?Kara2022/08/20 11:04 PM
    Hardware Transactional Memory, the end?dmcq2022/08/21 11:36 AM
      Hardware Transactional Memory, the end?rwessel2022/08/21 12:17 PM
        Hardware Transactional Memory, the end?---2022/08/21 01:26 PM
          Hardware Transactional Memory, the end?Andrey2022/08/21 06:39 PM
            Hardware Transactional Memory, the end?---2022/08/21 09:27 PM
              Hardware Transactional Memory, the end?Andrey2022/08/23 06:29 AM
                Hardware Transactional Memory, the end?---2022/08/23 10:00 AM
                  Hardware Transactional Memory, the end?iz2022/08/23 01:20 PM
                    Hardware Transactional Memory, the end?anonymou52022/08/23 02:57 PM
                  Hardware Transactional Memory, the end?Andrey2022/08/23 06:01 PM
                    Hardware Transactional Memory, the end?Anon2022/08/23 06:28 PM
                      Hardware Transactional Memory, the end?Andrey2022/08/24 04:10 AM
                        Hardware Transactional Memory, the end?Anon2022/08/24 08:50 AM
                          Hardware Transactional Memory, the end?rwessel2022/08/24 09:35 AM
                          Hardware Transactional Memory, the end?Etienne2022/08/25 01:54 AM
                            Hardware Transactional Memory, the end?Anon2022/08/25 05:25 AM
                              Hardware Transactional Memory, the end?Etienne2022/08/25 06:24 AM
                                Hardware Transactional Memory, the end?rwessel2022/08/25 08:16 AM
                                  Hardware Transactional Memory, the end?Linus Torvalds2022/08/25 10:16 AM
                                    Hardware Transactional Memory, the end?rwessel2022/08/25 11:00 AM
                                  Hardware Transactional Memory, the end?Etienne2022/08/26 12:54 PM
                    Hardware Transactional Memory, the end?anon22022/08/23 08:50 PM
                      Hardware Transactional Memory, the end?Andrey2022/08/24 03:54 AM
                        Hardware Transactional Memory, the end?anon22022/08/24 04:54 AM
                      Hardware Transactional Memory, the end?Simon Farnsworth2022/08/24 03:58 AM
                        Hardware Transactional Memory, the end?Konrad Schwarz2022/08/28 06:12 AM
          Hardware Transactional Memory, the end?Linus Torvalds2022/08/21 06:58 PM
            Hardware Transactional Memory, the end?rwessel2022/08/21 08:02 PM
              Hardware Transactional Memory, the end?anon22022/08/21 09:31 PM
                Hardware Transactional Memory, the end?dmcq2022/08/22 07:14 AM
                  Hardware Transactional Memory, the end?anon22022/08/23 12:15 AM
                    Hardware Transactional Memory, the end?dmcq2022/08/24 03:50 AM
                      Hardware Transactional Memory, the end?Linus Torvalds2022/08/24 11:56 AM
                        Hardware Transactional Memory, the end?dmcq2022/08/25 04:39 PM
            Hardware Transactional Memory, the end?---2022/08/21 09:33 PM
              Hardware Transactional Memory, the end?Linus Torvalds2022/08/22 11:32 AM
                Hardware Transactional Memory, the end?Anon2022/08/22 12:35 PM
                  Hardware Transactional Memory, the end?rwessel2022/08/22 04:47 PM
                Hardware Transactional Memory, the end?gpd2022/08/26 03:07 AM
                  Hardware Transactional Memory, the end?Michael S2022/08/26 03:46 AM
                    Hardware Transactional Memory, the end?Linus Torvalds2022/08/26 11:01 AM
                      Hardware Transactional Memory, the end?rwessel2022/08/26 06:08 PM
                        Hardware Transactional Memory, the end?anonymou52022/08/26 07:52 PM
  Hardware Transactional Memory, the end?zArchJon2022/08/24 10:12 AM
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