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Linux 5.9-rc6

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Linux

  • Linux 5.9-rc6
    Another week, another rc, and things look fairly normal: the diffstat
    looks fairly flat (implying small changes) and we don't have any
    unusual amount of activity.
    
    The one thing that does show up in the diffstat is the softscroll
    removal (both fbcon and vgacon), and there are people who want to save
    that, but we'll see if some maintainer steps up. I'm not willing to
    resurrect it in the broken form it was in, so I doubt that will happen
    in 5.9, but we'll see what happens.
    
    The other stats also look normal: about 60% of the patch is drivers
    (and yes, the softscroll is a noticeable part, but not overwhelmingly
    so - there's sound, gpu, mtd, i2c, usb etc). And the usual arch
    updates, along with some vm fixes (including the fix for the
    performance regression noted last rc) and perf tooling updates.
    
    We also have a (test regression (not the performance one) in the VM
    that we know about - the test that triggers this was admittedly buggy,
    but if the test was buggy it is quite possible that real uses are
    buggy too. We don't actually have any known case of any such real user
    breakage, but we do have a nice fix for the test regression that is
    very  much the RightThing(tm) to do in the long run, so that has been
    actively discussed.
    
    We know what the fix looks like, and a few initial patches have been
    floating around, but a final patch doesn't exist yet, and depending on
    how that goes this might be something that pushes out the final 5.9 by
    a week. We'll see.
    
    So there's still some development going on, but honestly, that VM case
    is a very odd corner case that normal users should never hit, so it
    should not keep anybody from testing this in the meantime.
    
    Holler if you see anything odd,
    
                      Linus
    
  • Linux 5.9-rc6 Released With Soft Scrollback Removed, Performance Regression Fixed

    The sixth weekly release candidate to Linux 5.9 is now available with at least two notable changes in particular.

    Prominent in Linux 5.9-rc6 is the fix for the previously reported performance regression hitting 5.9. In case you missed it from the end of last week, see the article on controlling page lock unfairness as part of addressing the performance regression. That code is now in Linux 5.9-rc6 and the performance is back on track with Linux 5.8 while I will have out more benchmark numbers soon on the revised Linux 5.8 vs. 5.9 performance state.

  • Kernel prepatch 5.9-rc6

    The 5.9-rc6 kernel prepatch is out.

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