Linux 5.9-rc6
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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
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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.
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Kernel prepatch 5.9-rc6
The 5.9-rc6 kernel prepatch is out.
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