Development [r20] arter97 kernel for OnePlus 9 series

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samwhiteUK

Senior Member
Jul 1, 2012
166
63
Cambridge
OnePlus 9 Pro
yep, although it took a while to get one (others were getting random reboots sooner than I was) -- in short, when I open my camera, I have about a 1 in 4 chance of getting a reboot, don't know why, but that is the only time I get them. went back to stock bc having my phone reboot when trying to take a video on xmas is something I don't feel like dealing with unfortunately. thing is this kernel is awesome in every way and I wish I could continue using, but that's the deal breaker for me
It was the camera for me too. Hopefully it gets fixed!
 

eugenechiuu

Senior Member
Oct 20, 2011
253
20
Just want to double check. If I would like to update to 11.2.10.10, the safest way woud be to do a local upgrade via a full installation file, re-root via magisk and flash back arter via FKM?
 

eugenechiuu

Senior Member
Oct 20, 2011
253
20
It won't work. You have to restore backup of partitions altered by this kernel.
You can also try other methods mentioned in comments above.


Ah ok, because if I read from the first post, installing a stock ROM with a full OTA restores the said partition. So that method doesn't work anymore huh.

/* Notice */

Only OxygenOS on Android 11 is supported.

This kernel touches vendor_boot and dtbo partitions, meaning you'd need to restore said partitions whenever you're switching to another kernel or stock.
Please make a back-up of these partitions. The installer doesn’t do this automatically for you. Installing the stock ROM with a full OTA restores said partitions as well.
 

l_mike

Senior Member
Jan 6, 2013
254
140
Huawei Watch 2
Xiaomi Mi Pad 4
Ah ok, because if I read from the first post, installing a stock ROM with a full OTA restores the said partition. So that method doesn't work anymore huh.

/* Notice */

Only OxygenOS on Android 11 is supported.

This kernel touches vendor_boot and dtbo partitions, meaning you'd need to restore said partitions whenever you're switching to another kernel or stock.
Please make a back-up of these partitions. The installer doesn’t do this automatically for you. Installing the stock ROM with a full OTA restores said partitions as well.
Thought so too, but it turned out differently ;)
 

thirtythr33

Senior Member
Sep 3, 2011
347
151
New York
OnePlus 6T
OnePlus 9 Pro
It won't work. You have to restore backup of partitions altered by this kernel.
You can also try other methods mentioned in comments above.
this is for anyone that was asking about the easiest way to do this process:

(if you don't have dtbo/vendor_boot/boot img's backed up): go to the telegram group for this kernel, find the user 'ileux' who posted 11.2.9.9AA img's, download all three (he posted an already magisk patched boot img), reboot to fastboot, run:
fastboot flash boot boot.img
fastboot flash dtbo dtbo.img
fastboot flash vendor_boot vendor_boot.img
reboot to oos
then local upgrade 11.2.10.10 (don't reboot when done)
flash twrp.zip from nebrassy's thread in magisk (if you use twrp) - don't reboot
flash magisk to inactive slot
- now reboot
profit
 

l_mike

Senior Member
Jan 6, 2013
254
140
Huawei Watch 2
Xiaomi Mi Pad 4
this is for anyone that was asking about the easiest way to do this process:

(if you don't have dtbo/vendor_boot/boot img's backed up): go to the telegram group for this kernel, find the user 'ileux' who posted 11.2.9.9AA img's, download all three (he posted an already magisk patched boot img), reboot to fastboot, run:
fastboot flash boot boot.img
fastboot flash dtbo dtbo.img
fastboot flash vendor_boot vendor_boot.img
reboot to oos
then local upgrade 11.2.10.10 (don't reboot when done)
flash twrp.zip from nebrassy's thread in magisk (if you use twrp) - don't reboot
flash magisk to inactive slot
- now reboot
profit
I don't think that's the easiest way since you install twrp anyway.
You can install twrp, install the full OTA via twrp, than reflash Magisk and kernel via twrp. All works fine fore me.
 

thirtythr33

Senior Member
Sep 3, 2011
347
151
New York
OnePlus 6T
OnePlus 9 Pro
I don't think that's the easiest way since you install twrp anyway.
You can install twrp, install the full OTA via twrp, than reflash Magisk and kernel via twrp. All works fine fore me.
yeah I get that, but I don't use twrp to flash oos unless I absolutely have to, but that works too. with this method you take care of everything without having to reboot until it's done
 

infamousvincci

Senior Member
Apr 10, 2013
1,477
341
Carson
OnePlus 9
OnePlus 9 Pro
Reading other peoples experience with updating, now I know its not only me that got screwed.

Usually local update overwrites my kernel and root and i just flash magisk on the other side and reboot.

Ill stick with stock kernel for now
 

infamousvincci

Senior Member
Apr 10, 2013
1,477
341
Carson
OnePlus 9
OnePlus 9 Pro
What happened to yours?
Usually i download the whole update (3gb) from oxygen updater and local update using the system and then flash magisk on the other slot (for ota) and then reboots.

But with this kernel, i cant do that. Something prevented me and it keeps failing so i tried to restore my back ups dtbo, vendor, boot and it soft bricked my op9. Black screen at all. Thankfully msm tool saved me and now im just gonna run 10.10 rooted with stock kernel.
 

eugenechiuu

Senior Member
Oct 20, 2011
253
20
Usually i download the whole update (3gb) from oxygen updater and local update using the system and then flash magisk on the other slot (for ota) and then reboots.

But with this kernel, i cant do that. Something prevented me and it keeps failing so i tried to restore my back ups dtbo, vendor, boot and it soft bricked my op9. Black screen at all. Thankfully msm tool saved me and now im just gonna run 10.10 rooted with stock kernel.
Oh man sorry to hear that, I gotta do a proper backup then before attempting to restore back up and update hmm.
 

eugenechiuu

Senior Member
Oct 20, 2011
253
20
this is for anyone that was asking about the easiest way to do this process:

(if you don't have dtbo/vendor_boot/boot img's backed up): go to the telegram group for this kernel, find the user 'ileux' who posted 11.2.9.9AA img's, download all three (he posted an already magisk patched boot img), reboot to fastboot, run:
fastboot flash boot boot.img
fastboot flash dtbo dtbo.img
fastboot flash vendor_boot vendor_boot.img
reboot to oos
then local upgrade 11.2.10.10 (don't reboot when done)
flash twrp.zip from nebrassy's thread in magisk (if you use twrp) - don't reboot
flash magisk to inactive slot
- now reboot
profit
So I tried local upgrade straight and it failed like how everyone else mentioned.

Managed to use the backup boot/dtbo/vendor boot images from the previous Omega kernel I was using. Flashed that, booted up and local upgrade works again, followed these steps and am back to rooted stock rom again.

Will observe using stock kernel for a bit and see whether they fixed any issues from previous stock or not.
 
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Samuel Holland

Senior Member
Jun 26, 2013
598
301
lake charles
OnePlus 9 Pro
I know this may not be supported officially in regards to the few posts above, but I personally flashed the last OTA in TWRP. Not sure if I had to but then I flashed TWRP retention script(magisk), kernel, and magisk. Everything seems okay so far and was a lot easier then the usual process. 🙂👍
 

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  • 12
    After a lot of test builds, I'm now marking r20 stable.

    Please re-read the OP for most up-to-date changes.

    Custom ROMs started to rebase their kernel to OxygenOS 12. Those ROMs are not supported, please keep that in mind.

    r20
    Backported MGLRU (a major change)
    Fixed full system crash on some custom ROMs (by LibXZR)
    Added a few memory patches to improve responsiveness (by kerneltoast)
    Fixed page allocation failures introduced from mainline
    SimpleLMK re-enabled after fixing soft random reboots
    Fixed excessive RMNET_DFC wakelock
    Fixed OnePlus charging code to handle worker failure
    Backported updated arm64 memory functions for better performance
    Disabled REFCOUNT_FULL to optimize performance over security
    Tuned swap/zram configurations
    Disabled zram writeback to avoid lags on long uptime
    Optimized pstore for better performance
    Added haptic level adjustment by flar2
    Reduced memory usage by matching CONFIG_CMA_AREAS to minimum required
    Re-enabled arm64 erratum that was previously disabled by mistake
    Fixed rare random reboots (zsmalloc patch by kerneltoast)
    Backported more BFQ commits from mainline
    Backported mm/mremap fix from mainline
    Now built with the latest Clang 14.0.7
    Device-tree updated to LA.UM.9.14.r1-19300-LAHAINA.QSSI13.0
    LA.UM.10.9.1.r1-02800-QCS610.0 merged
    LA.UM.9.16.r1-11000-MANNAR.0 merged
    Latest f2fs from Linux v5.19 merged
    Linux v5.4.197 merged
    Wi-Fi drivers updated to 2.0.8.29W
    Latest exFAT from Linux v5.19 merged
    Latest LRNG v45 merged
    2022-06-05 security patch merged
    8
    New beta release is up: r21b2.

    A few minor bugs have been fixed, but the new major change is the removal of BFQ in favor of Samsung's SSG I/O scheduler.

    Qualcomm has been using BFQ I/O scheduler for a while now, but its code complexity is quite huge, reaching 10K lines of code.
    This unfortunately, translates to more CPU overhead.

    With r21b1, BFQ is removed in favor of Samsung's in-house I/O scheduler: SSG.

    SSG is simple enough (only 1.1K lines of code) while still having some Android-specific optimizations such as background/foreground separation.

    I/O scheduler is a very complicated topic and synthetic benchmarks will not be able to capture the practical effects of one, hence the beta release.
    If you notice anything outside of ordinary (e.g., game stuttering, music dropping out, or major lags when updating apps from Google Play compared to r20), please report back.

    If all turns out fine, we can expect some battery improvements.

    r21b1 had the background profile set incorrectly. Please update.
    6
    r20b2 is up and I'm hoping it's the last beta for the r20 series.

    Some new CAF tag merges, LRNG v45 merge, v5.4.197 merge, latest f2fs merge, etc.

    Notable change perhaps is the removal of zram writeback.
    zram writeback was enabled to offload parts of memory to the UFS when it's unused for a long time, but it seems that it can contribute to lags overtime.

    It's been disabled for now.
    3
    Does not work. Only fastboot mode after flashing r20b2, tried it myself.
    Well, don't know what did people expect when it was stated by the DEV that OOS12 is not supported and never will be.
    2
    Sorry but i don't know if i understood. Do you have a OnePlus 9 and are using a custom rom and kernel from XDA?
    I'm on OnePlus 9 Pro unlocked from OnePlus. I am running latest version of this kernel on top of Derpfest custom ROM. Derp is not being maintained any longer.
    I played Diablo this morning for like three hours straight without a single issue. I use some magisk modules like universal GMS doze but not sure if it will make a difference for heat.
    I recommend getting all your MSM tool setup with drivers installed where your PC can see your phone in Fastboot and adb if you plan on going the custom route, that way if something goes wrong you can restore your device.
    Me personally, this phone has been pretty incredible besides a few issues like not recognizing my DAC.
    The phone does get warm, but I haven't had any issues with it overheating. I really have enjoyed the Diablo immortal so far.
    I would definitely recommend this kernel though after you make backups to the three partitions for A & B slots which would be six partitions total backed up. That way if you need to go back, you can restore.
    I hope this can help, I don't want to clutter the thread, but just wanted to tell you that for me, I wouldn't go back for nothing. We are really fortunate to have such talented devs sharing their work making LemonadeP_#1.
  • 56
    arter97-xda.png



    arter97 kernel for OnePlus 9 series running OxygenOS

    /* Features */

    Supports OnePlus 9 series
    Fully rebased kernel without unnecessary OnePlus code
    Latest CAF msm-5.4 kernel fully merged
    Latest Linux v5.4 subversion merged
    Latest Google’s security fix merged
    BBR as the default TCP network congestion control
    Features the latest WireGuard
    Modules support disabled for lighter kernel
    Latest Wi-Fi drivers from Qualcomm with customized config
    Built with Clang 13 and ThinLTO
    Power optimizations
    Memory management optimizations
    Latest SELinux subsystem backported from mainline
    Latest f2fs backported from mainline
    Latest BFQ I/O scheduler backported from mainline
    mmap/mremap backported from mainline for a major performance boost
    Touchscreen optimizations for lower latency
    Uses LRNG for better performance

    /* Details */

    - Fully rebased kernel without unnecessary OnePlus code -



    This kernel is not based on the stock OxygenOS kernel source provided by OnePlus. Instead, it’s based on the latest and greatest Qualcomm has to offer. Only the necessary parts from the OnePlus kernel have been cherry-picked, such as OnePlus 9 specific device drivers.

    This effectively kills all kernel modifications/optimizations from OnePlus, including the infamous app throttler.
    Due to the completely different base, this kernel will behave drastically different from other kernels, in both good and bad ways.


    - Power optimizations -


    This kernel makes some conscious decisions for reducing power consumption.

    First, the stock OnePlus configuration forces display-related processes to use the big cores exclusively.
    This configuration brings a huge power regression since it makes every frame dispatch to wake up and use the power-hungry cores.

    This kernel resets this profile to use the configuration Google recommends, which is to use the LITTLE cores exclusively instead. (Reverted in r2 as it seems like that little cores aren't enough to drive 120 Hz fluidly.)
    This kernel allows these processes to use little and middle cores (0-6), depending on the load.

    Second, this kernel disables wakelocks upon Wi-Fi’s RX unicast packet transmissions. qcom_rx_wakelock is one of the major culprits to increased idle power consumption. Although its total wakelock time is quite low, it's catched very frequently and prevents the system from entering suspend repeatedly.

    As dropping unicast or local ARP packets doesn’t pose practical issues on Android, this kernel disables qcom_rx_wakelock.

    Third, this kernel reduces the duration of the Bluetooth ISR wakelock from 2 seconds to 100ms. This was done from an observation that the average userspace response time from ISR is less than 10ms.
    My kernels have been doing this for years and no Bluetooth-related issues were reported.

    Fourth, the vibrator driver used in this kernel no longer controls the cpuidle driver. The stock kernel disables the cpuidle whenever the vibrator is used. This kernel disables it as the vibrator is not that sensitive to deadline misses.

    There are other small improvements throughout the kernel tree as well.


    - Memory management optimizations -


    This kernel marks the first Linux v5.4 based Android kernel to have MGLRU backported.

    MGLRU is a big deal in everything Linux related, especially for Android.
    Esper have a great article on what is MGLRU in a nutshell: https://blog.esper.io/android-dessert-bites-22-linux-memory-management-38419756/

    TL;DR:
    According to Google’s fleetwide profiling, multi-generational LRU yields an “overall 40% decrease in kswapd [the kernel daemon that manages virtual memory] CPU usage,” an “85% decrease in the number of low-memory kills at the 75th percentile,” and an “18% decrease in app launch times at the 50th percentile.”

    This kernel also disables LMKD and uses an in-kernel solution called SimpleLMK, made by kerneltoast. You can track how often SimpleLMK kicks in by monitoring:
    Code:
    /sys/module/lowmemorykiller/parameters/lmk_count

    This kernel also changes a lot related to swap and zram.

    The swap-related code has been backported from Linux v5.9 (link1, link2) to efficiently support fast swap device and allow swappiness over 100. This kernel currently sets swappiness to 160 on < 6GB of RAM, 120 on 8GB and 90 on 12GB.

    zram has been also backported from mainline Linux and further tweaked to use block device writeback. This is equivalent to the recent “RAM Plus” feature that companies have been marketing that uses the internal storage to extend RAM.

    This kernel uses zram writeback to offload idle pages (i.e., really, really unused RAM) to the internal storage. As it's extremely slow to bring pages back from UFS, writeback code works quite conservatively. It'll start to writeback pages that haven't been used for a day or two. It makes use of the hidden 2GB “last_parti” partition from the UFS storage.

    Along with zram writeback,
    this kernel also enables deduplication with xxHash. Each page stored in zram is checked for deduplication to further save memory. With these 2 features combined, RAM reaching 1GB is additionally saved, but your mileage may vary.

    zram writeback is temporarily disabled to avoid lags on long uptime with r20.

    The post boot script used in the stock ROM is also overridden and it sets the readahead to 128KB. As I/O workload under Android is mostly random, high readahead doesn’t help and only increases memory thrashing.

    This kernel also incorporates a lot of patches to reduce/optimize memory allocations used throughout the entire kernel.

    mmap/mremap code was also backported from Linux v5.10 to optimize ART (see here for more info).


    - Latest subsystems -


    This kernel backports the SELinux subsystem from mainline Linux. This includes caching improvements that drastically reduces time spent on lookups. 10K lines of code has been changed.

    This kernel also backports f2fs (Flash-Friendly File System) from mainline Linux. This includes bug fixes and performance improvements such as shorter discard latency, more optimized GC logic for Android, and checkpoint merging.

    BFQ I/O scheduler has also been backported from mainline Linux for better I/O performance.


    - LRNG -


    This kernel ditches the traditional RNG driver from the Linux kernel in favor of LRNG. See here and here for more info.

    A rudimentary throughput benchmark shows an improvement of 10.5% (keep in mind that this is only one aspect of an RNG metric).


    /* Notice */

    OxygenOS 12 is unsupported.
    Non-OxygenOS custom ROMs are supported, but your mileage may vary wildly. Most notably, gesture orientations on some ROMs may be inverted.
    Custom ROMs that uses OxygenOS 12 kernel, including LineageOS 19.1, are not supported.

    This kernel touches vendor_boot and dtbo partitions, meaning you'd need to restore said partitions whenever you're switching to another kernel or stock.
    Please make a back-up of these partitions. The installer doesn’t do this automatically for you. Installing the stock ROM with a full OTA restores said partitions as well.

    /* Disclaimer */

    Your warranty is now void.
    I am not responsible for bricked devices, dead SD cards,
    thermonuclear war, or you getting fired because the alarm app failed. Please
    do some research if you have any concerns about features included in this kernel
    before flashing it! YOU are choosing to make these modifications, and if
    you point the finger at me for messing up your device, I will laugh at you. Hard. A lot.

    /* Thanks to */

    Vishalcj17
    kristofpetho
    kdrag0n
    kerneltoast (SultanXDA)

    /* Instructions */

    1. Read the above. Please.
    2. Flash the zip file from FK Kernel Manager. Any other installation methods are untested.

    /* Downloads and links */

    arter97.com
    Kernel source
    Telegram chat link
    18
    r2 is up, and it's a big release.

    Changelog is quite self-explanatory.

    r2
    Display-related processes are now allowed to use the middle cores as well for better smoothness
    Enabled more mremap() performance improvement that was missing from r1
    LA.UM.9.14.r1-18400-LAHAINA.0 merged
    LA.UM.9.16.r1-08100-MANNAR.0 merged
    LA.UM.10.9.1.r1-00300-QCS610.0 merged (contains a lot of new improvements including power optimizations)
    Linux v5.4.159 merged
    Wi-Fi drivers updated to 2.0.8.25M
    2021-11-06 security patch merged
    Watermark boosting disabled to fix aggressive app killings (by Sultan)
    Workaround added to fix unwanted doubles presses from the power button
    18
    A major new testing release is up.

    Changes made in this round is big enough that I've decided to name it r20.

    While the build has been stable for me, I'm marking this an alpha as a lot changed.

    r20a1 marks the first Linux v5.4 based kernel to have MGLRU backported.

    MGLRU is a big deal in everything Linux related, especially for Android.
    Esper have a great article on what is MGLRU in a nutshell: https://blog.esper.io/android-dessert-bites-22-linux-memory-management-38419756/

    TL;DR:
    According to Google’s fleetwide profiling, multi-generational LRU yields an “overall 40% decrease in kswapd [the kernel daemon that manages virtual memory] CPU usage,” an “85% decrease in the number of low-memory kills at the 75th percentile,” and an “18% decrease in app launch times at the 50th percentile.”

    Personally, I've noticed a sharp decrease in swap usage and improvements in general performance.

    Besides MGLRU, there are other numerous patches that are worth noting.

    I've brought back updated arm64 routines that were once tried in a beta release but removed later due to random kernel panics (mostly notable from Netflix). The mainline Linux kernel have gotten new updates since then, so r20a1 includes that.
    Also, some memory patches made by Sultan are also picked, and I've confirmed that those also help improving responsiveness.

    With all these memory stuffs going on, I've also changed swap/zram's parameters. You'll notice a difference in how many apps you can keep open, etc.

    The excessive RMNET_DFC wakelock that annoyed some users are now also gone by incorporating a fix from Snapdragon 8 Gen 1.

    All in all, this is indeed a pretty big release.
    I'm expecting mixed feedback, so please let me know how the new kernel behaves.

    /* Full changelog */

    Backported MGLRU
    Fixed full system crash on some custom ROMs (by LibXZR)
    Added a few memory patches to improve responsiveness (by Sultan)
    Tuned swap/zram configurations
    Backported updated arm64 memory functions for better performance
    Fixed excessive RMNET_DFC wakelock
    Fixed OnePlus charging code to handle worker failure
    Backported more BFQ commits from mainline
    Backported mm/mremap fix from mainline
    Latest WireGuard merged
    LA.UM.9.14.r1-19400-LAHAINA.QSSI13.0 merged
    Linux v5.4.190 merged
    Wi-Fi drivers updated to 2.0.8.28K
    2022-04-05 security patch merged
    Latest f2fs from Linux v5.18 merged
    Now built with the latest Clang 14.0.5
    Device-tree updated to LA.UM.9.14.r1-19300-LAHAINA.QSSI13.0
    15
    /* Changelog */

    r20

    Backported MGLRU (a major change)
    Fixed full system crash on some custom ROMs (by LibXZR)
    Added a few memory patches to improve responsiveness (by kerneltoast)
    Fixed page allocation failures introduced from mainline
    SimpleLMK re-enabled after fixing soft random reboots
    Fixed excessive RMNET_DFC wakelock
    Fixed OnePlus charging code to handle worker failure
    Backported updated arm64 memory functions for better performance
    Disabled REFCOUNT_FULL to optimize performance over security
    Tuned swap/zram configurations
    Disabled zram writeback to avoid lags on long uptime
    Optimized pstore for better performance
    Added haptic level adjustment by flar2
    Reduced memory usage by matching CONFIG_CMA_AREAS to minimum required
    Re-enabled arm64 erratum that was previously disabled by mistake
    Fixed rare random reboots (zsmalloc patch by kerneltoast)
    Backported more BFQ commits from mainline
    Backported mm/mremap fix from mainline
    Now built with the latest Clang 14.0.7
    Device-tree updated to LA.UM.9.14.r1-19300-LAHAINA.QSSI13.0
    LA.UM.10.9.1.r1-02800-QCS610.0 merged
    LA.UM.9.16.r1-11000-MANNAR.0 merged
    Latest f2fs from Linux v5.19 merged
    Linux v5.4.197 merged
    Wi-Fi drivers updated to 2.0.8.29W
    Latest exFAT from Linux v5.19 merged
    Latest LRNG v45 merged
    2022-06-05 security patch merged

    r12
    Fingerprint code merged with latest the LineageOS
    90 Hz timing removed for custom ROMs to avoid noticeable gamma shifts
    Now built with the latest Clang 13.0.3
    Linux v5.4.186 merged
    Latest exFAT from Linux v5.18 merged
    LA.UM.9.14.r1-19300-LAHAINA.QSSI13.0 merged
    Wi-Fi drivers updated to 2.0.8.27T

    r11
    Added support for non-OxygenOS, custom ROMs (screen-off gesture orientations may be inverted)
    Added a workaround to prevent soft random reboots due to memory management
    Fixed a fingerprint-related memory-leak from OnePlus display source code
    Merged a few f2fs patches to improve responsiveness
    Backported more BFQ commits from mainline
    Backported mm/mremap fix from mainline
    Latest WireGuard merged
    LA.UM.9.16.r2-03700-MANNAR.0 merged
    Linux v5.4.184 merged
    Wi-Fi drivers updated to 2.0.8.27S
    2022-03-05 security patch merged

    r10
    Bug-fix, stable release

    r8
    Fixed r7's memory optimizations
    Merged latest exFAT

    r7
    Fixed a SELinux memory leak that happened since r1a12 (thanks to @Kaz205 for reporting and testing)
    Merged some memory operation optimizations
    Further improved the workaround to fix unwanted doubles presses from the power button

    r5
    LA.UM.9.16.r2-03500-MANNAR.0 merged
    Linux v5.4.179 merged
    Wi-Fi drivers updated to 2.0.8.26Z
    2022-02-05 security patch merged
    Backported UNIX socket latency optimization from Linux v5.17

    r4
    Fixed lmkd not working, resulting in freezes
    Minor performance and power optimizations
    Linux v5.4.175 merged

    r3
    SimpleLMK disabled for now to fix random soft reboots
    Fixed random app crashes and freezes due to op_cgroup
    Bluetooth drivers re-worked to fix Bluetooth-related issues
    USB malfunctions fixed (dwc3)
    LA.UM.9.14.r1-18900-LAHAINA.0 merged
    LA.UM.10.9.1.r1-00800-QCS610.0 merged
    Linux v5.4.174 merged
    Wi-Fi drivers updated to 2.0.8.26T
    2022-01-05 security patch merged
    Latest WireGuard merged
    Latest f2fs from Linux v5.17 merged
    Latest LRNG v43 merged
    Read-write semaphore backported from Linux v5.16 to improve smoothness under heavy I/O
    Now built with the latest Clang 13.0.2
    Disabled SLUB per-CPU partial caches for better latency (by Sultan)

    r2
    Display-related processes are now allowed to use the middle cores as well for better smoothness
    Enabled more mremap() performance improvement that was missing from r1
    LA.UM.9.14.r1-18400-LAHAINA.0 merged
    LA.UM.9.16.r1-08100-MANNAR.0 merged
    LA.UM.10.9.1.r1-00300-QCS610.0 merged (contains a lot of new improvements including power optimizations)
    Linux v5.4.159 merged
    Wi-Fi drivers updated to 2.0.8.25M
    2021-11-06 security patch merged
    Watermark boosting disabled to fix aggressive app killings (by Sultan)
    Workaround added to fix unwanted doubles presses from the power button

    r1
    First stable release
    15
    After months of tests, r3 is up and it's a major release that should fixes all major bugs from previous versions and improve performance.


    It turned out that using SimpleLMK causes random soft reboots due to page allocation failures.
    This kernel reverts back to using the stock lmkd until this issue is sorted out.
    You may experience a slight decrease in how many apps you can leave in the background.

    Also, random app crashes and freezes are fixed too.
    This was specific to OxygenOS, which freezes apps with cgroup and expects the kernel to un-freeze them, but with my kernel lacking that feature from OnePlus, using my kernel led to app crashes and freezes.
    This was fixed by forcefully disabling that feature from the kernel.

    Some Bluetooth and USB stuffs were also fixed with this release.


    Bug fixes alone make this a noteworthy release, but it also comes with nice performance improvements.

    With the Qualcomm HDK, I've managed to debug why using Clang 13 leads to boot failures.
    r3 has that issue sorted out and now the kernel uses the latest Clang 13.0.2 instead of 12.

    Read-write semaphore backported from Linux v5.16 will also give some nice latency improvements under heavy I/O.
    These patches are actively being talked in the f2fs mailing list for backporting to older Android devices.

    From Sultan (kerneltoast), r3 also has SLUB per-CPU partial caches disabled for better latency.


    r3
    SimpleLMK disabled for now to fix random soft reboots
    Fixed random app crashes and freezes due to op_cgroup
    Bluetooth drivers re-worked to fix Bluetooth-related issues
    USB malfunctions fixed (dwc3)
    LA.UM.9.14.r1-18900-LAHAINA.0 merged
    LA.UM.10.9.1.r1-00800-QCS610.0 merged
    Linux v5.4.174 merged
    Wi-Fi drivers updated to 2.0.8.26T
    2022-01-05 security patch merged
    Latest WireGuard merged
    Latest f2fs from Linux v5.17 merged
    Latest LRNG v43 merged
    Read-write semaphore backported from Linux v5.16 to improve smoothness under heavy I/O
    Now built with the latest Clang 13.0.2
    Disabled SLUB per-CPU partial caches for better latency (by Sultan)