LWN: Comments on "Realtime preemption locking core merged"

Realtime preemption locking core merged

lordgilman — Thu, 02 Sep 2021 01:44:39 +0000

With the merging of the realtime patch set Linux is now complete. Thanks to everyone who participated.

Realtime preemption locking core merged

tglx — Wed, 01 Sep 2021 20:01:45 +0000

The remaining larger pieces are:

- memory management: The bulk of those changes sits in the akpm tree and hopefully makes 5.15-rc1

- printk: Another batch is destined for 5.15-rc1, but we still have a few steps to overcome there. Most of the technical issues have been solved, but there are quite some details to sort

- fs/namespace: The last trylock loop which causes headache. A few attempts have been made before and we're still twisting our brains around it

The rest is the tail of small changes here and there, but nothing fundamental anymore.

Spectacular!

clump — Wed, 01 Sep 2021 18:13:24 +0000

Realtime really helps when recording audio with Linux. The stock kernel is usually quite good but you can often get better latency with realtime kernels. Hopefully this makes life easier for mainstream Linux distributions.

Phoronix info

david.a.wheeler — Tue, 31 Aug 2021 23:16:07 +0000

Phoronix has a little additional information here:

https://www.phoronix.com/scan.php?page=news_item&px=P...

Realtime preemption locking core merged

fhuberts — Tue, 31 Aug 2021 18:36:25 +0000

That's a lot of typos :-(
Too hyped I guess.

Realtime preemption locking core merged

fhuberts — Tue, 31 Aug 2021 18:34:57 +0000

Insanely awesome work!
And even more awesome that the developers stuck with it for so long.

This is absolutely a huge milestone, even though we're not there yet, we so very close now!

This is going to have a major impact if distribution are going to provide RT kernels soon: interactivity of desktops, audio/video workstation, real-time data processing applications. There are so many use-case that can benefit from this!

Spectacular!

david.a.wheeler — Tue, 31 Aug 2021 17:26:13 +0000

This is great news! There are a lot of situations where you need a real-time OS, yet you're able to accept the hardware requirements (such as memory size) of a kernel like Linux. This will open up the Linux kernel to many more potential uses.

I presume there's going to be more to do to make this "useful" to many. I hope there will be an LWN.net article about what are the next important things to do for real-time on Linux :-).

Realtime preemption locking core merged

q_q_p_p — Tue, 31 Aug 2021 17:15:14 +0000

This preemption model is not available on any of the archs yet, right ? I wanted to try it, but it's not shown in the menuconfig and it seems no arch sets ARCH_SUPPORTS_RT=y

Realtime preemption locking core merged

smurf — Tue, 31 Aug 2021 16:08:26 +0000

Nice. So what's left in the realtime stack? Any interesting remaining problems, or just a heap of tidbits to clean up?

Realtime preemption locking core merged

jcm — Tue, 31 Aug 2021 15:56:36 +0000

This is an awesome piece of news. Congrats to everyone!