\o/ Linus merged the bulk of the #PREEMPT_RT locking infrastructure for proper #realtime support to #Linux mainline, which thus will be a part of #kernel 5.15: git.kernel.org/torvalds/c/e5e…

Congrats to Thomas and everyone involved!

To quote: ```[…] The underlying concepts…
…of this code have been in use in PREEMPT_RT for way more than a decade. The code has been refactored several times over the years and this final incarnation has been optimized once again to be as non-intrusive as possible, i.e. the RT specific parts are mostly isolated. […]```
Reminder: that's "bulk of the locking infra", which is a big part of what's currently in #PREEMPT_RT, but other things remain there. IOW: It's a really big step for #REALTIME support in mainline, but not the last. More info expected in a status update this month on @linuxplumbers
@linuxplumbers What's still left in the #PREEMPT_RT (aka #Realtime for the #Linux #kernel) patchset can be seen here: git.kernel.org/pub/scm/linux/… (ignore ~72 locking patches now merged)

It among others includes a 35 patches series from @tehcaster to make SLUB RT compatible: lore.kernel.org/lkml/202108231…
The jury is still out, but it's in the cards the patch-set to make SLUB compatible to #PREEMPT_RT will make it into #kernel 5.15 as well:

Side note: details on the RT locking infra now merged into #Linux mainline can be found here: lwn.net/Articles/86611…

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More from @kernellogger

21 Oct 20
I need 4 tweets for the highlights in main #network merge for #Linux 5.10:

* #BPF programs can be shipped with the #kernel and loaded on boot via the User Mode Driver mechan. git.kernel.org/torvalds/c/0bc…

* sleepable BPF programs
git.kernel.org/torvalds/c/104…
lwn.net/Articles/82541…

(1/4)
* BPF Type Format (BTF) support for type and enum discovery & support for using BTF within the kernel itself
git.kernel.org/torvalds/c/98b…

* add and consume TCP header options in BPF programs, allowing easy experim. and deployment-specific TCP option use
git.kernel.org/torvalds/c/0bc…

(2/4)
* redirect_neigh() BPF packet redirect helper, allowing to limit stack traversal in common container configs; Daniel reports ~10Gbps => ~15Gbps performance gain
git.kernel.org/torvalds/c/b4a…

* BPF programs can call map_update_elem on sockmaps
git.kernel.org/torvalds/c/3c4…

(3/4)
Read 4 tweets

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