[WIP] Crimson Kernel [EAS] [8.1.0/9.0]

[sys01]

Hi everyone
As title shows, this is a WIP project
(I don't own the device, all builds are blind!)

What is EAS?
Energy Aware Scheduling (EAS) is an enhancement to Linux power management, unifying CPU power control under the Linux kernel. EAS extends the Linux kernel scheduler to make it fully aware of the power/performance capabilities of the CPUs in the system, to optimize energy consumption for advanced multi-core SoCs including big.LITTLE. With EAS, the Linux kernel will use the task load and a CPU ‘Energy Model’ to control task placement to select the optimal CPU to run on.

Google thinks, EAS is the way to go for the future. With this kernel you can get pixel (2) experience even before the pixel (2) is released.

Interesting links for further research:
https://www.xda-developers.com/google-pixel-fastest-android-phone-eas/
https://developer.arm.com/open-source/energy-aware-scheduling

Features
- Full EAS 1.3 implementation (based on EAS Project and LineageOS official kernel)
- Works on HMP ROMS too (you need to use sched/schedutil, HMP stuff are removed from kernel, otherwise you'll face freqs stuck at 100%)
- STune Boost for better battery and performance
- F2FS supported
- Tweaks and changes under the hood

Feel free to try and report your feedback (and logs too)

Download here

Installation
- Reboot to TWRP
- Backup your current boot.img
- Flash the kernel
- Reboot!

Sources here

Credits
@OrdenKrieger
@jcadduono
@joshuous (EAS Project)
And everyone worked for this device and LineageOS bring-up

 

[sys01]

Changelog

04/11
- Initial release

07/11
- Completely rebased over the latest CAF Oreo Tag (LA.UM.6.6, it *should* work on Pie, but not guaranteed!)
- 3.18.124
- Completely re-done EAS
- New LMK for better RAM managment
- Android upstream for AIO (check if MTP works better or worse than before)
- Better battery and performance

 

[sklaes]

EAS - Energy Aware Scheduling
WIP - Work in Progress
HMP - Heterogeneous Multi-Processing
HAL - Hardware abstraction layer

Do you plan to update the kernel on a regular base?

 

[sys01]

EAS - Energy Aware Scheduling
WIP - Work in Progress
HMP - Heterogeneous Multi-Processing
HAL - Hardware abstraction layer

Do you plan to update the kernel on a regular base?

When there are major changes to be applied - then yes
Otherwise makes no sense to push update with little to no changes at all

You tested it?

 

[Gases]

Currently testing it on LOS16. Boots just fine, I'm charging the phone to 100% now to give it a go and I'll be back with some feedback tomorrow. So far everything I've tested works fine.

 

[sklaes]

Not jet, but EAS sounds interesting

Update: installed - currently testing

 

[AnonVendetta]

@sys01: You've said that it works on ROMs based on LineageOS. But does it work on ROMs that are based on AOSP? Is F2FS supported for data and cache partitions?

Thanks!

---------- Post added at 07:47 AM ---------- Previous post was at 07:46 AM ----------

[/COLOR @sys01: You've said that it works on ROMs based on LineageOS. But does it work on ROMs that are based on AOSP? Is F2FS supported for data and cache partitions?

Thanks!

 

[Predatorhaze]

i use this now on dotos oreo with f2fs data.But on interactive the cpu freq stays on max,whatsup with this?

 

[AnonVendetta]

@Predatorhaze: So, you say this kernel works with F2FS data on DotOS Oreo? I literally just tried that a few days ago, but with Hellsgate/Schwifty kernels, no go. But maybe I'll try again now. Thanks for the heads up!

 

[sys01]

i use this now on dotos oreo with f2fs data.But on interactive the cpu freq stays on max,whatsup with this?

This is an EAS kernel, you need to use sched/schedutil (interactive gov won't work anymore)

 

[sys01]

@sys01: You've said that it works on ROMs based on LineageOS. But does it work on ROMs that are based on AOSP? Is F2FS supported for data and cache partitions?

Thanks!

---------- Post added at 07:47 AM ---------- Previous post was at 07:46 AM ----------

[/COLOR @sys01: You've said that it works on ROMs based on LineageOS. But does it work on ROMs that are based on AOSP? Is F2FS supported for data and cache partitions?

Thanks!

F2FS is supported, I'll update the thread to explain that better

 

[Predatorhaze]

@Predatorhaze: So, you say this kernel works with F2FS data on DotOS Oreo? I literally just tried that a few days ago, but with Hellsgate/Schwifty kernels, no go. But maybe I'll try again now. Thanks for the heads up!

i have data in f2fs,and yes it boots and everything works till now.
Only is that dolby atmos dont work anymore,dont know why.On previous build with ext4 it worked.

I was confused because the freq on interactive,but already read a answer and that is due its eas kernel.
good we have eas now,i use helix engine also

if anyone got a working dolby atmos,pls let me know

 

[Predatorhaze]

This is an EAS kernel, you need to use sched/schedutil (interactive gov won't work anymore)

ok.untill now everything seems stable.
can you set schedutil as default on next update? and you think about adding kcal feature (saturations etc) and some wakeblocks?
running on dotos 2.5 oreo,magisk 17.3,crimson kernel,f2fs data partition and los universal v2 bootstack

 

[ChrisFeiveel84]

an update to the current lineage OS kernel would be great since September has changed a lot on the go kernel

Your kernel works with AOSP Basis Rom
(have your kernel briefly tested with the havoc 2.0 Rom)

 

[levp]

Running this right now on LOS 15, for the entire day, without any issues that I can see. :good:
Used EX Kernel Manager to set governors.

 

[Gases]

The kernel runs pretty well on Pie, but I think it's pretty aggressively throttled. Once the temp gets to 40°C the LITTLE cores get set to 960 MHz and the big cores to around the same. It's also kind of sluggish when the phone is taken out of deep sleep, and scrolling isn't that great. However, deep sleep works wonders. The discharge rate with screen off is ~0.3% per hour.

Oh, and it may just be me, but playing audio thtough the speakers makes the phone temp get pretty high, which again makes it get throttled and really slow.

 

[sys01]

The kernel runs pretty well on Pie, but I think it's pretty aggressively throttled. Once the temp gets to 40°C the LITTLE cores get set to 960 MHz and the big cores to around the same. It's also kind of sluggish when the phone is taken out of deep sleep, and scrolling isn't that great. However, deep sleep works wonders. The discharge rate with screen off is ~0.3% per hour.

Oh, and it may just be me, but playing audio thtough the speakers makes the phone temp get pretty high, which again makes it get throttled and really slow.

New version coming soon, hopefully this time around should be way more smooth and stable
Also, EAS takes time to make it perfect, but soon or later it will!

 

[wannaskoo]

Thank you for your work. This kernel is great and really shows the benefits of EAS on an older SOC like the S820. Sure, it needs polishing, but it's a great start

 

[Gases]

New version coming soon, hopefully this time around should be way more smooth and stable
Also, EAS takes time to make it perfect, but soon or later it will!

For sure, not complaining at all! Just wanted to give some honest feedback in case you wanted to keep tweaking it

 

[nsane]

New version coming soon, hopefully this time around should be way more smooth and stable
Also, EAS takes time to make it perfect, but soon or later it will!

Thank you very much! Great work