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dvyukov's profile
Dmitry Vyukov
Dmitry Vyukov
Dmitry Vyukov
@dvyukov

Tweets

Dmitry Vyukov

@dvyukov

I tweet about fuzzing, bugs, sanitizers, security, hardening, kernels, Go, performance, concurrency, lock-free algorithms.

Munich, Germany
1024cores.net
Joined April 2009

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    Dmitry Vyukov‏ @dvyukov 17 Feb 2019
    • Report Tweet

    Dmitry Vyukov Retweeted Emery Berger

    Mind blown: C heap compaction based on practical ideas. No pointer updates, instrumented writes, etc. Merge data from 2 pages into 1, map it on 2 virt addresses, temp mprotect source page to deal with concurrent writes. Free/reuse old page. Profit.https://twitter.com/emeryberger/status/1096879743956205569 …

    Dmitry Vyukov added,

    Emery Berger @emeryberger
    “Mesh: Compacting Memory Management for C/C++ Applications” https://arxiv.org/abs/1902.04738 , #PLDI 2019 pic.twitter.com/6qIAzeesdY
    12:07 AM - 17 Feb 2019
    • 105 Retweets
    • 313 Likes
    • Roman Lipovsky Iziren Oise Anatol A. Mashuta j00ru//vx Jason Cai Thomas Manceau Kelly Sommers eax Chen Zhixiang
    7 replies 105 retweets 313 likes
      1. New conversation
      2. Manish‏ @ManishEarth 17 Feb 2019
        • Report Tweet
        Replying to @dvyukov @davecheney

        I've always wanted to see allocator stuff that used this. See also: std::vector impl that can grow without ever needing to copy more than a page of data

        1 reply 0 retweets 6 likes
      3. Bruce Mitchener‏ @ArmyOfBruce 17 Feb 2019
        • Report Tweet
        Replying to @ManishEarth @dvyukov @davecheney

        Been looking at playing with VMOs and VMARs in the Zircon kernel for Fuchsia to see what is possible there.

        1 reply 0 retweets 1 like
      4. 8 more replies
      1. New conversation
      2. Avi Kivity‏ @AviKivity 17 Feb 2019
        • Report Tweet
        Replying to @dvyukov

        mprotect()/munmap() calls stalling the CPU while broadcasting TLB flushes over the entire system. This is very expensive for many-core servers.

        1 reply 0 retweets 20 likes
      3. 2 more replies
      1. Xerxes Rånby‏ @xranby 18 Feb 2019
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        Replying to @dvyukov

        I love when academic papers is backed up with sourcecode and examples!https://github.com/plasma-umass/mesh …

        0 replies 0 retweets 2 likes
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      1. New conversation
      2. c[ad]+r‏ @ph_hofer 17 Feb 2019
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        Replying to @dvyukov

        You'll burn at least sizeof(struct vm_area_struct) on Linux when you remap the page, so there's other memory/fragmentation to consider.

        1 reply 0 retweets 0 likes
      3. Bobby Powers‏ @lilbobbypowers 22 Feb 2019
        • Report Tweet
        Replying to @ph_hofer @dvyukov

        In our evaluation we use cgroups to measure amount of kernel memory allocated on behalf of the process - even with this still a win!

        0 replies 0 retweets 2 likes
      4. End of conversation
      1. Sandro Manke (闪山)‏ @2dbrain 22 Feb 2019
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        Replying to @dvyukov @copyconstruct

        Yeah that paper is rather nice :)

        0 replies 0 retweets 1 like
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      1. ;pHil /n_n‏ @inpHilltr8r 17 Feb 2019
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        Replying to @dvyukov @bkaradzic

        can't quite put my finger on why my gut thinks this is a bad solution to a well understood problem something something page tables something

        0 replies 0 retweets 0 likes
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      1. Carlo Alberto Ferraris‏ @CAFxX 17 Feb 2019
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        Replying to @dvyukov @davecheney

        Agreed that's really smart. I'm just worried about the security implications. Maybe memory tagging will help?

        0 replies 0 retweets 0 likes
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