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UKSM Is Still Around For Data Deduplication Of The Linux Kernel

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  • UKSM Is Still Around For Data Deduplication Of The Linux Kernel

    Phoronix: UKSM Is Still Around For Data Deduplication Of The Linux Kernel

    Several years back we wrote about Ultra Kernel Samepage Merging (UKSM) for data de-duplication within the Linux kernel for transparently scanning all application memory and de-duping it where possible. While the original developer is no longer active, a new developer has been maintaining the work and continues to support it on the latest Linux kernel releases...

    http://www.phoronix.com/scan.php?pag...KSM-Linux-4.10

  • #2
    Has Torvalds ever commented on this? I think it would be good to take a break in kernel development to fix bugs and get rid of the duplications.

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    • #3
      Originally posted by Ronshere View Post
      Has Torvalds ever commented on this? I think it would be good to take a break in kernel development to fix bugs and get rid of the duplications.
      I don't think this code does what you think it does.

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      • #4
        Originally posted by Ronshere View Post
        Has Torvalds ever commented on this? I think it would be good to take a break in kernel development to fix bugs and get rid of the duplications.
        It seems to be data deduplication for what's in memory, not for Linux's code (;

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        • #5
          Originally posted by Ronshere View Post
          Has Torvalds ever commented on this? I think it would be good to take a break in kernel development to fix bugs and get rid of the duplications.
          UKSM is made to get programs to share some of their duplicated memory areas to save memory. It is has nothing to do with the Linux source code.

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          • #6
            And it also opens an avenue for all sorts of side-channel attacks, memory deduplication is a perfect example of a false good idea.

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            • #7
              Originally posted by AsuMagic View Post

              UKSM is made to get programs to share some of their duplicated memory areas to save memory. It is has nothing to do with the Linux source code.
              I it has, how can it not bee when it path the kernel?

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              • #8
                We will have benchmark for see about efficacy of UKMS in recent kernel?

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                • #9
                  The information in this article is partly not true. UKSM is still maintained by its original author, Nai Xia, it is not abandoned, and patches get updates on the original site. Also, according to Nai's information, 4.10 patch is on the way with some extra fixes.

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                  • #10
                    Originally posted by fguerraz View Post
                    And it also opens an avenue for all sorts of side-channel attacks, memory deduplication is a perfect example of a false good idea.
                    For shared systems I would agree - but if you control the host and the stuff running on it, why not? might be a good way to reduce memory footprint

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