Development [r12] arter97 kernel for OnePlus 9 series

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Kickazz080

Member
May 10, 2014
27
4
Hello beautiful people, I installed arter97 r2 a few weeks ago and I'm noticing frequent force closes with FB, IG or twitter, the phone getting hot randomly without even doing anything and some bluetooth issues. Forces me to reboot a few times a day... now I want to fully revert the phone to stock without bricking. Can anyone give me the safest method of doing so? Like, arter fixed my framedrops and heat generation during gaming, so thats really nice, but for every day use, its horrible for me... can anyone recommend anything?
 

Adelino80

Member
Dec 22, 2021
26
3
Hello beautiful people, I installed arter97 r2 a few weeks ago and I'm noticing frequent force closes with FB, IG or twitter, the phone getting hot randomly without even doing anything and some bluetooth issues. Forces me to reboot a few times a day... now I want to fully revert the phone to stock without bricking. Can anyone give me the safest method of doing so? Like, arter fixed my framedrops and heat generation during gaming, so thats really nice, but for every day use, its horrible for me... can anyone recommend anything?
If you made backups of your boot and vendor boot partitions and the dbto partition you can flash them via fastboot. Or you can flash the stock rom via TWRP to restore said partitions.
 

arter97

Recognized Developer
Oct 14, 2012
3,806
34,170
24
Seoul
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)
 

arter97

Recognized Developer
Oct 14, 2012
3,806
34,170
24
Seoul
r4 is up.

Unfortunately, another major issue in r3 was discovered.
After removing SimpleLMK, I released r3 expecting that lmkd would work.

OxygenOS's lmkd, however, works a bit differently that required me to add a workaround in the kernel to work properly.

Everyone who uses r3 must switch to r4.

Sorry for the inconvenience, but now I'm 99.9% confident that all major issues are resolved with r4.

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

Kydaix

Member
Feb 10, 2022
35
14
France
OnePlus 9 Pro
r5 is up.

r4 was already stable and r5 is a minor maintenance release.
Some performance improvements with security patch merge.

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
With this new version, my phone starts strangely.
The boot animation freezes, disappears, reappears, and the startup takes a bit longer.
Am I the only one?

- Magisk 24.1
- Android 11/OOS 11.2.10.10.LE15AA

VIDEO HERE.

EDIT: I just made sure that the problem is with the R5 version by reinstalling the R4 version, booting (no problem), then reinstalling the R5 version (problem).
 
Last edited:

DashDashCZ

Senior Member
Oct 19, 2014
137
59
Czech Republic
OnePlus 9 Pro
With this new version, my phone starts strangely.
The boot animation freezes, disappears, reappears, and the startup takes a bit longer.
Am I the only one?

- Magisk 24.1
- Android 11/OOS 11.2.10.10.LE15AA

VIDEO HERE.

EDIT: I just made sure that the problem is with the R5 version by reinstalling the R4 version, booting (no problem), then reinstalling the R5 version (problem).
I don't have this problem.
 

greg491

Member
Apr 4, 2021
7
2
With this new version, my phone starts strangely.
The boot animation freezes, disappears, reappears, and the startup takes a bit longer.
Am I the only one?

- Magisk 24.1
- Android 11/OOS 11.2.10.10.LE15AA

VIDEO HERE.

EDIT: I just made sure that the problem is with the R5 version by reinstalling the R4 version, booting (no problem), then reinstalling the R5 version (problem).
I have this problem as well. It's scary to see it happen. But kernel seems to be working fine. I hope this gets fixed, as I really like the smooth boot animation
 
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arter97

Recognized Developer
Oct 14, 2012
3,806
34,170
24
Seoul
r6 is up.

Turned out a memory leak was present since r1a12.
r6 fixes it but judging from weeks of uptime being fine previously, I think it was a minor memory leak.

Nonetheless, please update.

r6
Fixed a SELinux memory leak that happened since r1a12 (thanks to @Kaz205 for reporting and testing)
Further improved the workaround to fix unwanted doubles presses from the power button
 

greg491

Member
Apr 4, 2021
7
2
The boot animation is still wack in r6. But honestly it's not that bad. As long as it boots I'm fine with it
 

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  • 8
    r20a4 is up.

    Some bug fixes here and there and continued testing for memory management.
    8
    r20a7 is up, and it's a different kind of a testing build.
    The RAM is deliberately limited to 6 GB to test the kernel under more severe memory pressure.

    r20 should be able to cope with extreme memory pressure.
    Multitasking should be somewhat poorer compared to previous releases (obviously), but the key point of this alpha build is to ensure no severe lag appears even under extreme memory pressure.

    Compared to a6, simple LMK is hooked up to MGLRU as well to cope better with OOM scenarios.

    I expect r20a7 to be a bit slower and multitasking to be a bit more limited, but totally usable nontheless.
    If you want to accelerate r20 release, please join in and test r20a7.

    Thanks.
    7
    New alpha build r20a2 is up.

    Due to some memory issues causing major lags, I've decided to revert MGLRU for now and take r20 alpha rounds to debug more memory-related issues.
    Simple LMK by Sultan (kerneltoast) is back to speed up memory debugging.

    Please consider joining the Telegram group and sending feedback/logs.

    Thanks.
    5
    Thanks to some super active testers, I was able to look for what I wanted in r20a7.

    r20b1 is up as a first beta release for r20.
    The memory limit obviously is removed now.

    This version also adds vibration control by flar2, used by other kernels and ROMs.

    If all goes well, I'm planning to mark r20 stable soon.
    4
    r20a5 is up.

    MGLRU is re-enabled with this release.
    Please test how the general performance behaves.
  • 55
    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 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.

    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.

    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
    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
    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
    15
    After using the kernel myself and daily driving for few days and monitoring how the kernel behaves, I now feel comfortable to mark it stable.

    r1 is released.

    The original post is re-written to feature what's special with this kernel.
    Please take your time and re-read the original post.
    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)