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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. JF Bastien‏ @jfbastien 1 Aug 2016
      Replying to @RichFelker

      I'd ask @paulmckrcu

      1 reply 0 retweets 0 likes
    2. Paul E. McKenney‏ @paulmckrcu 2 Aug 2016
      Replying to @jfbastien @RichFelker

      We tried something like that some years back for realtime, but gave up on it due to deadlocks, IIRC.

      1 reply 0 retweets 1 like
    3. Rich Felker‏ @RichFelker 2 Aug 2016
      Replying to @paulmckrcu @jfbastien

      That's unfortunate. The "copy" part of RCU seems to make the whole kernel OOM-unsafe and prob. frag-unsafe for nommu.

      2 replies 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 2 Aug 2016
      Replying to @RichFelker @paulmckrcu @jfbastien

      TREE_RCU "..is designed for very large SMP system with hundreds or thousands of CPUs...also scales down nicely.." No.

      1 reply 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 2 Aug 2016
      Replying to @RichFelker @paulmckrcu @jfbastien

      Why does everybody love breaking the important real-world case (1-8 cores) for the sake of HPC wackiness? :-(

      1 reply 0 retweets 0 likes
    6. Paul E. McKenney‏ @paulmckrcu 2 Aug 2016
      Replying to @RichFelker @jfbastien

      Lots of important real-world cases with a wide range of CPUs. You are doing mobile or some such?

      1 reply 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker 2 Aug 2016
      Replying to @paulmckrcu @jfbastien

      Mobile and embedded. But even for reasonable desktop and server use locks are better.

      2 replies 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 2 Aug 2016
      Replying to @RichFelker @paulmckrcu @jfbastien

      But I don't think this is solvable in Linux. The code using the RCU api actually does the alloc/free operations...

      2 replies 0 retweets 0 likes
    9. Paul E. McKenney‏ @paulmckrcu 2 Aug 2016
      Replying to @RichFelker @jfbastien

      Any chance of a clear statement of what you believe the problem to be? :-)

      1 reply 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker 2 Aug 2016
      Replying to @paulmckrcu @jfbastien

      Aside from overall complexity cost, the fact that RCU users have to alloc/free data that otherwise would be perm.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 2 Aug 2016
      Replying to @RichFelker @paulmckrcu @jfbastien

      This makes it near-impossible to guard against catastrophic failure on OOM (needs difficult & costly accounting).

      8:35 AM - 2 Aug 2016
      1 reply 0 retweets 0 likes
        1. Paul E. McKenney‏ @paulmckrcu 2 Aug 2016
          Replying to @RichFelker @jfbastien

          The stall warning you encountered is part of that accounting.

          1 reply 0 retweets 0 likes
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