Development [Kernel][04.05.2023][Android 13.0.0 Stable]Kirisakura_Raviantah 1.0.4 for Pixel 7/Pro aka "Pantah"

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Freak07

Freak07

Recognized Developer / Recognized Contributor
Jan 2, 2011
6,243
21,793
Update to 1.2.3

Hey guys and girls,

So here´s the next release. Thanks for @woundman for taking the time and providing logs regarding the freeze issue.
It seems like the updated GPU driver from QPR Beta is causing issues for some.
This release has those changes to the GPU driver reverted and has it reset back to the stable state.

Since it´s only been a few days that 1.2.2 with a few bigger changes was released including January changes, here a link to the changelog of 1.2.2.

Please note: The kernel is made for stable A13 firmware, not beta.

I wish everyone a nice day.


Changelog:

- Linux-Stable bumped to 5.10.162
- reset gpu driver back to stable state



Download:
Attached to release post as AFH is currently down.
I´ll push to AFH once it´s back up.

Make sure to update or keep the powerhint module installed via Magisk Manager!


If you´re coming from another kernel restore stock boot.img, dtbo.img, vendor_kernel_boot.img and vendor_dlkm.img before flashing. Thank you.

Make sure to meet the requirements and read the OP as well as the FAQ before flashing.

I wish everybody a great day/evening!
Have fun, enjoy the kernel and your phone.



If you like my work please consider a donation.
Donations are not mandatory but very welcome.
If you like my work and want to buy me a coffee/green tea: http://paypal.me/freak07
 

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M

m3ath

Senior Member
Nov 3, 2016
132
21
Huawei MatePad Pro
Google Pixel 7
Freak07 said:
thanks @woundman that looks like it could turn out useful.

It seems there´s a problem with the GPU driver.
I guess the updated GPU driver from QPR2 Beta might not be 100% stable in the end.

I´ll try to find time to get a new build with those changes reverted.
Click to expand...
Click to collapse
You are the best, thank you so much for your great work. I have been facing this issue since the December update, but the March beta update solved the problem on my own
But you know the cause of the problem
 
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cultofluna

cultofluna

Senior Member
Nov 25, 2015
4,105
2,085
Google Pixel 6 Pro
Google Pixel 7
Freak07 said:
Update to 1.2.3

Hey guys and girls,

So here´s the next release. Thanks for @woundman for taking the time and providing logs regarding the freeze issue.
It seems like the updated GPU driver from QPR Beta is causing issues for some.
This release has those changes to the GPU driver reverted and has it reset back to the stable state.

Since it´s only been a few days that 1.2.2 with a few bigger changes was released including January changes, here a link to the changelog of 1.2.2.

Please note: The kernel is made for stable A13 firmware, not beta.

I wish everyone a nice day.


Changelog:

- Linux-Stable bumped to 5.10.162
- reset gpu driver back to stable state



Download:
Attached to release post as AFH is currently down.
I´ll push to AFH once it´s back up.

Make sure to update or keep the powerhint module installed via Magisk Manager!


If you´re coming from another kernel restore stock boot.img, dtbo.img, vendor_kernel_boot.img and vendor_dlkm.img before flashing. Thank you.

Make sure to meet the requirements and read the OP as well as the FAQ before flashing.

I wish everybody a great day/evening!
Have fun, enjoy the kernel and your phone.



If you like my work please consider a donation.
Donations are not mandatory but very welcome.
If you like my work and want to buy me a coffee/green tea: http://paypal.me/freak07
Click to expand...
Click to collapse
Thanks for the update.,
Also users on stock December or January patch getting random freezes restarts...

I've noticed that on stock November were no issues...
problems started after Google has merged QPR on December stable
 
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Freak07

Freak07

Recognized Developer / Recognized Contributor
Jan 2, 2011
6,243
21,793
m3ath said:
You are the best, thank you so much for your great work. I have been facing this issue since the December update, but the March beta update solved the problem on my own
But you know the cause of the problem
Click to expand...
Click to collapse
cultofluna said:
Thanks for the update.,
Also users on stock December or January patch getting random freezes restarts...

I've noticed that on stock November were no issues...
problems started after Google has merged QPR on December stable
Click to expand...
Click to collapse
Yes indeed, it happens on stock too as was report earlier.

Sounds like there are probably more problems, not just a single one.
That makes debugging way harder and also identifying for users. :)

At least the one @woundman provided a log for should be not happening any longer.

Thanks for providing the information :)
 
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G

Ghisy

Senior Member
Mar 27, 2010
2,044
872
HTC Desire
Google Nexus 4
For what it's worth, I used to have random reboots on the November firmware and Kirisakura. Since the Pixel drop December update, it's been fine so far! 🤞

The updated CPU driver seemed to work fine for me as well but I still updated to the latest release. YMMV I guess.
 
D

djcsurf

Senior Member
Jan 9, 2011
2,025
443
Kent
I'm not sure if it's related to Jan update or v1.2.3 of kernel but the phone does not connect to car stereo now via Bluetooth, initially if gives pairing code but does not connect. Before I updated firmware & kernel all was fine.
 
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Lughnasadh

Lughnasadh

Senior Member
Mar 23, 2015
5,173
6,061
Google Nexus 5
Huawei Nexus 6P
djcsurf said:
I'm not sure if it's related to Jan update or v1.2.3 of kernel but the phone does not connect to car stereo now via Bluetooth, initially if gives pairing code but does not connect. Before I updated firmware & kernel all was fine.
Click to expand...
Click to collapse
Many people who updated to the January security update are reporting this, so not kernel related.

9to5google.com

Google Pixel owners seeing Bluetooth and Android Auto issues following January update

The January 2023 update for Google Pixel phones appears to be causing issues with Bluetooth and Android Auto in cars.
9to5google.com 9to5google.com
 
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Freak07

Freak07

Recognized Developer / Recognized Contributor
Jan 2, 2011
6,243
21,793
djcsurf said:
Sorry one more question, if I revert back to December firmware will v1.2.3 be ok or back down to v1.2.1?
Click to expand...
Click to collapse
based on the changes I think 1.2.3 should also work for december stable firmware.

Just a bit of a note, downgrading from a higher security patch to a lower one will most probably need a wipe as well. I haven´t done this in a long time, but I´m fairly sure that´s still the case.
 
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D

djcsurf

Senior Member
Jan 9, 2011
2,025
443
Kent
Freak07 said:
based on the changes I think 1.2.3 should also work for december stable firmware.

Just a bit of a note, downgrading from a higher security patch to a lower one will most probably need a wipe as well. I haven´t done this in a long time, but I´m fairly sure that´s still the case.
Click to expand...
Click to collapse
I did ask about flashing back in PF thread (it might work). Thanks for letting me know about 1.2.3 much appreciated.
 
Duhjoker

Duhjoker

Senior Member
Jul 13, 2019
296
175
where palm trees grow
Google Pixel 3a
Google Pixel 7
so i have been able to compile the kernel now with out error. i then made my commits and flashed but got nothing and there isnt a fastbootd. but i was able to reflash the stock vendor_kernel_boot back.

so i decided to to just build and test without changes and the same. just tries to reboot over and over again til it goes back to fastboot and still no fastbootd.

if you want to see my source you can check here

github.com

GitHub - Biohazardousrom/android_kernel_google_gs201 at QPR1

Contribute to Biohazardousrom/android_kernel_google_gs201 development by creating an account on GitHub.
github.com github.com

sorry to keep bothering you here but dont know who else to ask but kernel devs and i really appreciate the help advise and work you do
 
S

Schroeder09

Senior Member
Nov 6, 2017
1,152
227
Google Pixel 7 Pro
Flashed the latest 1.2.3 on my p7p. I was having a momentary line flash across the top ⅓ of the screen. The flash was momentary and nearly imperceivable. I even had Amazon send me another phone over it. I thought it was indicative of a failing GPU, so this really interested me. Since getting the new phone I have discovered that it does it too! That being said I've deduced that there has to be a software issue. Both phones were setup the same and running your kernel. There was one person on telegram who was somehow able to get a screenshot of the glitch and asked if anyone else has had the issue! I responded to them in a DM, told them I had, and asked if they had any of the custom software that I have. They never replied. Regardless, this was really interesting given the fact I thought I might have a GPU issue. Thanks.
 
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cultofluna

cultofluna

Senior Member
Nov 25, 2015
4,105
2,085
Google Pixel 6 Pro
Google Pixel 7
Schroeder09 said:
Flashed the latest 1.2.3 on my p7p. I was having a momentary line flash across the top ⅓ of the screen. The flash was momentary and nearly imperceivable. I even had Amazon send me another phone over it. I thought it was indicative of a failing GPU, so this really interested me. Since getting the new phone I have discovered that it does it too! That being said I've deduced that there has to be a software issue. Both phones were setup the same and running your kernel. There was one person on telegram who was somehow able to get a screenshot of the glitch and asked if anyone else has had the issue! I responded to them in a DM, told them I had, and asked if they had any of the custom software that I have. They never replied. Regardless, this was really interesting given the fact I thought I might have a GPU issue. Thanks.
Click to expand...
Click to collapse

Schroeder09 said:
Flashed the latest 1.2.3 on my p7p. I was having a momentary line flash across the top ⅓ of the screen. The flash was momentary and nearly imperceivable. I even had Amazon send me another phone over it. I thought it was indicative of a failing GPU, so this really interested me. Since getting the new phone I have discovered that it does it too! That being said I've deduced that there has to be a software issue. Both phones were setup the same and running your kernel. There was one person on telegram who was somehow able to get a screenshot of the glitch and asked if anyone else has had the issue! I responded to them in a DM, told them I had, and asked if they had any of the custom software that I have. They never replied. Regardless, this was really interesting given the fact I thought I might have a GPU issue. Thanks.
Click to expand...
Click to collapse
I have exactly the same issue
 
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  • 7
    TotallyAnxious
    TotallyAnxious
    dd805bb said:
    I remember when Samsungs were first rooted with magisk, some models needed this because the log space would fill up. On pixels not so much. The log space doesn't run out. I believe most those are also not maintained anymore because they don't need them anymore. Magisk has been updated so much since a few years ago. Unless your running on debug, you don't need to worry about logs. That is the way to actually fix your phone if you have issues. Looking at the logs. The other guy is right, don't use this module at all. Or anything like it.
    Click to expand...
    Click to collapse
    *girl

    I thought a dog dressed as a queen would make it obvious lol guess not.
    View
    4
    TotallyAnxious
    TotallyAnxious
    xSoydere said:
    Can you recommend a better one? Or they arent needed at all?
    Click to expand...
    Click to collapse
    I wouldn't use any module like this.
    View
    2
    D
    dd805bb
    TotallyAnxious said:
    *girl

    I thought a dog dressed as a queen would make it obvious lol guess not.
    Click to expand...
    Click to collapse
    My apologies. I assumed you were a male. My bad. I didn't mean any offense.

    Your reply I reread a few times then got it. Lol. You are correct either way.
    View
    2
    TotallyAnxious
    TotallyAnxious
    I wouldn't use it.
    View
    1
    Slim2none4u
    Slim2none4u
    aleksgiab said:
    In Hentai Rom does the kernel come in?
    Click to expand...
    Click to collapse
    From OP:
    "- this kernel is tested on stock google firmware. If you want to use it on custom roms you´re kind of on your own as I can´t account and give support for any changes custom roms apply that could render the kernel incompatible. (e.g. if you´re custom rom is still on the previous months update, there may be issues flashing an updated kernel for the next month on top or custom roms requiring specific kernel changes to work correctly )"
    View
  • 19
    Freak07
    Freak07
    Yeedatoy said:
    The gains from disabling fsync are massive on every device I've owned capable of having it disabled.
    Click to expand...
    Click to collapse
    "Massive" as in benchmarks. Small in non benchmark scenarios, scoped storage eats up those gains for a lot of apps too.
    Opposing are the risk of data loss, the greater risk of data corruption.
    Yeedatoy said:
    It's my understanding that the whole data loss thing is an event that PCs are sensitive to, at least often enough to where it's been reported to the point where it's spread this far throughout the internet. I've had countless reboots unexpectedly from other issues, experiments, dead batteries etc...over the last 8 years without ever experiencing data corruption...in fact the only issues with unexpected corruption I've had have been due to Google's mutilated updates. Lol. Seriously though.
    Click to expand...
    Click to collapse
    Because Android keeps fsync strictly enabled for very good reasons and it´s harder to disable than on PC. Only a very small number of users actually unlock their phones, and an even smaller number play with fsync.
    I´ve seen cases of corrupted phones because fsync was disabled on a crash. I don´t want this happen when running my kernel.

    You´re understanding is wrong. Android is as sensitive (more sensitive due to android being android) to data loss/corruption in case of a crash as PCs are.
    If you disabled fsync and never faced data loss/corruption on corruption you were just "lucky", the same can happen for anyone else in the other "unlucky" direction.

    Same as with the GPU stuff below. If you´re fine with those consequences that´s one thing, but posting in an advertising manner when there are a lot of users not fully aware of the risks is another. Especially if the risks are downplayed, because one never faced an issue. This gives a wrong impression for many users not familiar with those things.

    Yeedatoy said:
    It's also my understanding that fsync doesn't have to always be off. If dynamic fsync is introduced, it automatically switches back on when the screen turns off. I'm not arguing or trying to persuade you to do anything that you don't feel comfortable with, but it is honestly the only reason I stopped using this kernel. If anything, I'm just giving my 2 cents in case it interests you enough to look into it a bit more. Thank you for all of your amazing work.
    Click to expand...
    Click to collapse
    Yes, there´s the possibility of "dynamic" fsync. That means you might only lose data from when your screen was last enabled and fsync will happen when the screen is off in the best case.
    This does not prevent the possibility of data corruption at all when the phone crashes while the screen is on.

    It´s not about being comfortable.
    Some options are just not worth the risk, given the real world gains. Especially since there are snippets around the internet and XDA (like the part in your post above) that completely understate the risk of disabling fsync.
    It´ll appear as a simple option in kernel manager apps once added, accessible to everyone including those not aware of the risk. I can change the sysfs endpoint so it´s a bit more hidden, but again there´s no benefit in adding the option in the first place.

    You might run the kernel that supports disabling fsync just fine, device crashes or shuts down unclean, corruption happens without you even noticing it for a week or longer.
    Then switch back to stock or any other kernel and slowly begin to face random issues after a week or two due to that corruption.
    I know XDA is partly about providing options to the user. At least it is for me. But some things are better be left alone. That´s why I´d appreciate if this option is never provided in any kernel.

    Yeedatoy said:
    One last thing...I installed a few Samsung specific, rather Exynos specific kernel managers after digging through the galaxy threads and they expose some more options on our devices such as MIPS Dynamic voltage min/max, and IRQ control. I'm still trying to learn more about Exynos crap because it's foreign to me, so I'm wondering if this could be advantageous.
    Click to expand...
    Click to collapse
    If you find anything interesting about the exynos roots let me know. :)
    Some of the exynos parts are just there and not actually enabled, because the firmware disables or just simply has no support for certain exynos parts, because google doesn´t use it.

    Yeedatoy said:
    I knew benchmarks are a controversial topic but I've always liked to pull every bit of performance out of everything I've owned, whether it be a phone, car, my shlong ( couldn't resist) and I've already been able to shut those annoying **** talking Xiaomi Mi10 ultra guys up by dominating 100% of their devices on 3d mark while still not having to charge my phone for 24 hours or keep a fire nearby
    Click to expand...
    Click to collapse
    There´s not much controversy about benchmarks for me. Benchmarks are simply tools for testing very specific scenarios.
    You like to chase high benchmark scores, which is completely fine with me.
    Benchmark scores may translate to improvements in real world usage, but must not which is most often the case.


    As for the GPU topic:
    I´ve seen enough dead devices due to playing with the GPU freqs/voltages too. It happens rarely, but when it happens there´s a dead phone with a fried mobo. Not worth it either.
    If you´re fine with those consequences that´s one thing, but posting in an advertising manner when there are a lot of users not fully aware of the risks is another.

    Not_Purgatory said:
    Dynamic fsync (the fsync replacement driver faux123 wrote a long time ago) is pretty much dead and causes nothing else than crashes and random reboots on modern / newer versions of the Android adapted Linux kernel.

    Maybe what you mean is replacing the default fsync with asynchronous fsync instead?
    Click to expand...
    Click to collapse
    Additionally to that filesystems are a lot further than 5-10 years ago, where this idea originates from.
    As I´m aware asynchronous fsync improves when copying extremely large numbers of files (rather what happens on servers). I wonder how often that happens on regular usage in Android.

    It´s not worth adapting that dynamic fsync driver, because most kernel devs value file system integrity higher than boosted benchmark scores or small real world improvements.





    As everybody can see this became quite a lengthy post, but this topic really matters to me.
    I once suffered filesystem corruption due to a buggy f2fs patch and it was ugly. I never wish that to happen to anyone!
    View
    7
    TotallyAnxious
    TotallyAnxious
    dd805bb said:
    I remember when Samsungs were first rooted with magisk, some models needed this because the log space would fill up. On pixels not so much. The log space doesn't run out. I believe most those are also not maintained anymore because they don't need them anymore. Magisk has been updated so much since a few years ago. Unless your running on debug, you don't need to worry about logs. That is the way to actually fix your phone if you have issues. Looking at the logs. The other guy is right, don't use this module at all. Or anything like it.
    Click to expand...
    Click to collapse
    *girl

    I thought a dog dressed as a queen would make it obvious lol guess not.
    View
    6
    schmeggy929
    schmeggy929
    aleksgiab said:
    In originale rom root how do we install the specific kernel??
    Click to expand...
    Click to collapse
    By reading the instructions in the first post of this thread.
    View
    5
    F
    ffuser1
    xxqxpxx said:
    Would this fix the overheating problem?
    Click to expand...
    Click to collapse
    you need to give a lot more detail as to what you're talking about. overheating is likely related to your own personal use and background app activities. or give any details for troubleshooting
    View
    4
    Yeedatoy
    Yeedatoy
    The gains from disabling fsync are massive on every device I've owned capable of having it disabled. It's my understanding that the whole data loss thing is an event that PCs are sensitive to, at least often enough to where it's been reported to the point where it's spread this far throughout the internet. I've had countless reboots unexpectedly from other issues, experiments, dead batteries etc...over the last 8 years without ever experiencing data corruption...in fact the only issues with unexpected corruption I've had have been due to Google's mutilated updates. Lol. Seriously though.

    It's also my understanding that fsync doesn't have to always be off. If dynamic fsync is introduced, it automatically switches back on when the screen turns off. I'm not arguing or trying to persuade you to do anything that you don't feel comfortable with, but it is honestly the only reason I stopped using this kernel. If anything, I'm just giving my 2 cents in case it interests you enough to look into it a bit more. Thank you for all of your amazing work.

    One last thing...I installed a few Samsung specific, rather Exynos specific kernel managers after digging through the galaxy threads and they expose some more options on our devices such as MIPS Dynamic voltage min/max, and IRQ control. I'm still trying to learn more about Exynos crap because it's foreign to me, so I'm wondering if this could be advantageous. I knew benchmarks are a controversial topic but I've always liked to pull every bit of performance out of everything I've owned, whether it be a phone, car, my shlong ( couldn't resist) and I've already been able to shut those annoying **** talking Xiaomi Mi10 ultra guys up by dominating 100% of their devices on 3d mark while still not having to charge my phone for 24 hours or keep a fire nearby
    View
  • 83
    Freak07
    Freak07
    Kirisakura-Kernel for the Pixel 7/Pro

    Hello everyone,

    To keep it short: Here is Kirisakura - Kernel for the Google Pixel 7 Pro aka Cheetah and the Pixel 7 aka Panther, together Pantah.
    I would appreciate if everybody that flashes the kernel, reads at least once through this opening post and the following ones.

    The kernel aims to keep most of the subsystems updated, way ahead of the stock kernel, thereby improving security, stability and performance!
    This includes Linux-Stable, F2FS-Stable and kernel/common!
    If that got you curious, have a read about linux-stable and why it is important here. The stable-process is not the same for every subsystem, but the general idea, rule of thumb and benefits are applicable for other subsystems as well.
    By merging linux-stable regularly we get most security updates months ahead of the stock kernel and also before they even end up in the android security bulletin.


    The kernel includes a lot of improvements and contributions from other developers as well. Without those contributtion this kernel would not exist as it is.
    A big part of improvements originate from @arter97´s, @kdrag0n´s and @Sultanxda´s work. Many others contributed in some way or another to this kernel.
    A big thanks to all of them at this place!

    Now lets continue with a list of features in the next paragraph!

    Features:
    Main Features:
    - Based on latest A13 kernel sources from Google, Kernel is made for Android 13 Stable
    - Linux-Stable-Upstream included to 5.10.179
    - Compiled with prebuilt Google clang 17.0.1
    - Backport entire RCU subsystem to linux 6.0
    - Lazy RCU which should result in power-savings while the device is lightly-loaded or idling, more information here
    - Backport Maple tree from Linux 6.1
    - Per VMA-locks in conjunction with Maple Tree RCU-Mode (improve app launch time, this feature in general benefits greatly from lazy rcu!)
    - Dynamic Energy Models depending on device state
    - make TEO-Cpuidle util-aware (improves latency, performance and decreases energy consumption for certain workloads, more information here)
    - improve CPU throttling behaviour
    - improvements to uclamp, prevent capacity inversion (reduce missed frames)
    - greatly speed up camera launch time!
    - merged kernel/common (improvements to android-common-kernel straight from google)
    - MM subsystem reworked (more info and some patchsets linked in this post)
    - Multi-gen LRU backported/reworked and enabled (more info here, here as well and here) to improve mm and reduce cpu cycles, latest V15 state
    - pelt multiplier tied into powerhal to speed up scheduler during interaction (more info here)
    - prevent frequency spikes caused by small transient tasks when the device is idle(more info here)
    - tie mechanism to prevent frequency spikes caused by small tasks also into powerhal
    - scheduler improvements for RT (realtime) tasks
    - introduce and setup PMU limiter (prevents CPU from spiking to max when it isn´t needed, based on PMU reads, more information here)
    - improve camera performance by tuning the powerhal during recording
    - bias tasks of rt, sf and ta groups to prefer high capacity cpus during app launches, interactions
    - improve app launches via powerhal
    - restrict maximum CPU-Freqs during screen off/ idle to 1.4GHZ for all clusters to save power
    - introduce unfair f2fs rwsems to prevent writer starvation and improve IO perf under heavy load
    - fuse: give wakeup hints to scheduler to speed up compress/decompress in internal storage (details)
    - enable RCU_BOOST (details here), also fix RCU_BOOST behaviour
    - F2FS-Stable updated
    - merge and enable f2fs block_age-based extent cache (improve the accuracy for data temperature classification, reduce the garbage collection overhead after long-term data updates)
    - TCP backports from mainline
    - SSG IO scheduler for reduced overhead and less CPU cycles (more lightweight and android optimized)
    - scheduler backports from linux-main
    - mm updates from linux-main
    - locking updates frm linux-main
    - improve memory performance by tweaking google´s eh zram implementation
    - fix sysfs endpoint for googles eh zram
    - affine IRQS to CPU 7 during camera usage for improved performance as it tends to overload the little cores
    - use bbr as default TCP congestion algorithm (fasted algo according to this excellent research from @kdrag0n found here )
    - include bbrv2 from google, more info here
    - Enable support for TTL spoofing
    - important patches from kernel/common for 5.10 (here are more details)
    - increase priority of GPU work
    - several updates from QPR beta, and a few from Pixel 6 that googles missed to include in the pixel 7 kernel
    - improve thermals
    - change compaction proactiveness based on device state for improveed memory management
    - improve ZRAM usage
    - flashing the kernel will preserve root


    CleanSlate Features
    - CleanSlate Features from @tbalden, big applause here! (s2s, notification booster, battery saver, flashlight notifications. Please note: cleanslate features that work otherwise with rooted devices like kadaway (adblocking) are not implemented on this kernel since I´m running rooted)
    - Check the CleanSlate thread for more information about those features
    - The CleanSlate thread also contains the apps that allows you to control those features!
    - If you consider those features useful, maybe consider purchasing the apps in the PlayStore or a small donation to @tbalden, he deserves it! Don´t forget to switch to beta channel for those apps, as this is needed for device running A13!


    Various Optimizations:
    - update several drivers to use power efficient workingqueues (for example wlan driver)
    - f2fs: reduce timeout for uncongestion
    - f2fs: Demote GC thread to idle scheduler class
    - f2fs: set ioprio of GC kthread to idle
    - tcp: enable advanced tcp, give user more options for tcp alorithm
    - mm: vmstat: use power efficient workingqueues
    Wakelock Blocker:
    - advanced wakelock blocker with the ability to block kernel wakelocks (dangerous, use with caution, please read this for further info). You should only block kernel wakelocks in case you face uncontrollable scenarios, like company wifi causing a wakelock to be active 100% of the time! Blocking kernel wakelocks to "improve" battery life almost always backfires and causes issues!


    Powerhint Module:
    - restrict little cluster to 1,4ghz mid cluster to 1,4ghz and big cluster to 1,4ghz during screen off, to reduce battery usage for example during music playback
    - only use little cores during screen off/device suspend
    - account for scheduler and other changes done to the kernel
    - boost memory interface controller during interaction (decreased missed frames, improved soc efficiency according to google docs)
    - tie pelt multiplier into the powerhal (more info here)
    - prevent frequency spikes caused by small transient tasks during idle operation (more info here)
    - boost scheduler using the pelt multiplier during fingerprint unlock operation
    - setup and control PMU limiter via powerhal (more info here)
    - switch between default and custom idle energy model on device is being interacted with / device idle.
    - reduce missed frames during scrolling/device interaction by adjusting uclamp boosts
    - dynamically adjust target load for memory interface during interaction.
    - remove dynamic GPU policy change as it´s causing instability and is unneeded due to GVFS period
    - implement handling during video recording of CPU like Google did on QPR A13
    - more small improvements

    DOWNLOAD:
    Downloads are attached to the release posts linked below in the changelog section.

    Please note that androidfilehost is currently not working properly.
    Link to AFH:
    Deprecated afh download, still here for old releases:


    Changelog:
    Android 13.0.0 Stable (not QPR beta!)
    1.0.0 Initial Release | Mirror for Download in case AFH is not working
    1.1.0 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-87743627
    1.2.0 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-87822161
    1.2.1 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-87878321
    1.2.2 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-87944505
    1.2.3 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-87960183
    1.2.4 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-88108123
    1.3.0 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-88286027
    Raviantah_1.0.0 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-88316285
    Raviantah_1.0.1 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-88323527
    Raviantah_1.0.2 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-88399915
    Raviantah_1.0.4 https://forum.xda-developers.com/t/...-pixel-7-pro-aka-pantah.4509795/post-88497279




    Requirements

    - vbmeta flags for verity/verification disabled (this requires a wipe if you´re coming from stock with those flags enabled), check the FAQ for information on how to do this
    - unlocked Bootloader
    - USB-Debugging in developer options enabled
    - latest adb and fastboot binaries
    - working adb and fastboot environment so you can flash back to stock in case something goes wrong
    - working magisk environment (a device rooted with latest magisk, use stable in case you want to be absolutely safe)
    - IMPORTANT: Unrelated to the kernel, but update both slots of your phone to A13 before you flash anything to your device!
    - it´s handy to have a backup and a way to return back to stock (check the faq for that)
    - make sure to download the correct kernel version for your firmware. (you can´t flash a kernel made for stable firmware on a QPR beta or dev preview and expect there to be no isses, the release posts mention which firmware the respective kernel releases are compiled for)
    - this kernel is tested on stock google firmware. If you want to use it on custom roms you´re kind of on your own as I can´t account and give support for any changes custom roms apply that could render the kernel incompatible. (e.g. if you´re custom rom is still on the previous months update, there may be issues flashing an updated kernel for the next month on top or custom roms requiring specific kernel changes to work correctly )
    - it´s always best to start on stock images and don´t have another custom kernel flashed when flashing this kernel for the first time. consecutive flashes can just be installed on top, if not I´ll mention it in the release post
    - read the first and second post, there's a lot of valuable information


    How to flash the Kernel:
    1a. Make sure you tick all the requirements above
    1b. Make sure to flash the release made for your firmware! Usually the release post contains information on that
    1. Download the kernel.zip (unified for both devices) and the correct powerhint module depending on your device (Pixel 7 = panther || Pixel 7 Pro = cheetah)
    2. Flash the powerhint module via magisk manager as you would any other magisk module! Make sure to flash the latest one. It will be mentioned in the release post if there´s an update.
    3. Flash the kernel.zip via EXKM, FKM or kernel flasher. Root will be preserved.
    4. Reboot and profit.


    Donations:
    Donations are not mandatory but very welcome if you want to support development or just buy me a coffee/tea/beer :)
    If you like my work: http://paypal.me/freak07

    Credits:
    @osm0sis for all his work on AK3.
    @tbalden for being the best HTC, Pixel, OnePlus and Asus wingman!
    @capntrips for all his work on the pixels, avb, hashtree patcher, the counsel and the kernel flasher!
    @LeeDroid and @mwilky for their awesome roms and work I used on multiple devices!
    @Captain_Throwback for all the mentoring and guidance!
    @Eliminater74 for bringing me into the game and the Inspiration
    @nathanchance for his upstream guidance and assistance
    @RenderBroken for helping me out
    @flar2 for all his work
    @joshuous for all the help he provided to me in the past!
    @arter97 for giving me advice
    @kdrag0n for his help and advices!
    @topjohnwu for magisk and his entire work!


    Source Code: https://github.com/freak07
    View
    51
    Freak07
    Freak07
    Update to 1.2.4

    Hey guys and girls,

    So here´s the next release. February source did basically not contain anything new for this kernel (as all patches were already included since months due to merging linux-stable and kernel/common in advance) except a stability and a security fix for the GPU driver (which is vendor specific so of course not impacted by linux-stable etc).
    Nonetheless this is a very big release with large underlying changes.
    Short explanation follows below.

    Please note that this release is not for the QPR Beta firmware, but the stable android 13 firmware!
    Make sure to update/flash the new powerhint module attached to this post via magisk manager as it´s been updated!

    Maple Tree / Per VMA-locks via Maple Tree in RCU-Mode
    Linux 6.1 finally merged the Maple Tree patchset. I had my eyes on that patchset for quite a while now. I backported it a few months ago (back in november iirc) but at that time I still ran into a few problems with it so it never made it into a release on XDA.
    However after discovering work done on per vma-locks, which builds directly on the benefits that maple-tree provides interest was sparked again. Decided to pull it in again and fix the remaining issues.
    If you´re interested in details read the linked topics.
    Basically those patches reduce app launch time as well as lock contention. Additionally per vma-locks directly utilizes lazy-rcu, which was backported in 1.1.0. Usually I´m very hesitant when it comes to kernel changes actually translating to real world power consumption improvements, but lazy-rcu is one of the few patchsets that translate to a small improvement for everyone regardless of the usage.
    So the new per VMA-lock patchset directly benefits from the previous backport of lazy-rcu.
    App launch times in ms for cold launching slack app with and without the Per-VMA lock patchset:
    1675766626796.png


    F2FS block_age-based extent cache
    Latest f2fs-stable update contained an interesting new feature called block_age-based extent cache. It´s another optimization done in hindsight to android needs. It´s always nice to see different OEMs (in this regards xiaomi) cooperating and improving android as a whole and not just keep those patches to themselves. Since it´s pushed to f2fs-stable it will sooner or later (probably rather later as trickling through until it ends up on actual production devices always takes a lot of time) find its way to the majority of android devices.
    The features allows to record data block update frequency of the extent per inode, in order to provide better temperature hints for data block allocation thereby improving the accuracy for data temperature classification and reducing the garbage collection overhead after long-term data updates.

    Memory Interface Controller Boosting
    Boost Memory Interface Controller slightly to a fixed min_freq value during interaction, instead of relying solely on the governor taking the decision as it doesn´t ramp up fast enough during interaction in some cases.
    Research of exynos/tensor characteristic shows that the SOC does not perform optimally when cpu freqs ramp up quickly (during interaction, scrolling, touch the screen) and memory interface controller not following suite quite fast enough. This makes the soc overall perform less efficient. The boost aims to correct this behavior.
    The boost also results in a tiny few less missed frames during interaction as a bonus.


    There are other small improvements as well. Please check my github for those.

    The kernel is made for stable A13 firmware, not beta.

    I wish everyone a nice day.


    Changelog:

    - Linux-Stable bumped to 5.10.167
    - Backport Maple tree from Linux 6.1
    - Per VMA-locks in conjunction with Maple Tree RCU-Mode (this benefits greatly from lazy rcu!)
    - bump f2fs to latest f2f2 stable state
    - merge and enable f2fs block_age-based extent cache (improve the accuracy for data temperature classification, reduce the garbage collection overhead after long-term data updates)
    - improvements to the scheduler from QPR2 Beta 2 and Beta 3
    - improvements to memory management from QPR2 Beta 2
    - improve ZRAM usage
    - boost memory interface controller during interaction (decreased missed frames, improved soc efficiency according to google docs)
    - import security fixes and performance improvments to camera driver from QPR2 Beta
    - fixes/improvements to to memory management
    - security fixes/ improvements from kernel/common
    - other fixes please check github



    Download:
    Attached to release post as AFH is currently down.

    Make sure to update and keep the powerhint module installed via Magisk Manager!


    If you´re coming from another kernel restore stock boot.img, dtbo.img, vendor_kernel_boot.img and vendor_dlkm.img before flashing. Thank you.

    Make sure to meet the requirements and read the OP as well as the FAQ before flashing.

    I wish everybody a great day/evening!
    Have fun, enjoy the kernel and your phone.



    If you like my work please consider a donation.
    Donations are not mandatory but very welcome.
    If you like my work and want to buy me a coffee/green tea: http://paypal.me/freak07
    View
    49
    Freak07
    Freak07
    Update to 1.2.1

    Hey guys and girls,

    So here´s the next release. As already hinted it includes some of the kernel changes from the QPR2 Beta. Please note the kernel is made for the stable firmware! You need to be on December stable firmware release to be able to install and run this kernel properly!
    Make sure to flash both, the kernel.zip and the powerhint magisk module as both are updated.

    Google did some significant updates in that latest qpr2 update, which is great to see.

    The GPU driver is now based on version r38p1. This fixes several vulnerabilities that made the news recently.

    AOC driver and WiFi driver were also updated and most of those improvements ended up in this kernel release as well.
    There were several improvements to memory management done by google, which should result in improved efficiency, improved reclaim and also reduced jank.
    There are a few other nice patches that should improve performance and generally improve system responsiveness. For specifics please check those on github. :)

    Scheduler patches from linux-main are also included.
    The lazy rcu patchset was updated to the latest state that was also recently merged into the linux kernel. (more info about lazy rcu check here)

    Kernel is now compiled with latest 16.0.2 prebuilt Clang from Google.


    There are other small improvements as well. Please check my github for those.


    I wish everyone a nice day.


    Changelog:

    - Linux-Stable bumped to 5.10.159
    - Bump prebuilt clang to latest 16.0.2 from Google
    - include most of the QPR2 improvements so we can enjoy them ahead of time
    - fixes/improvements to to memory management
    - import all improvments from google QPR2 to powerhint module
    - other fixes please check github



    Download:
    Attached to release post as AFH is currently down.
    I´ll push to AFH once it´s back up.

    Make sure to update the powerhint module via Magisk Manager!


    If you´re coming from another kernel restore stock boot.img, dtbo.img, vendor_kernel_boot.img and vendor_dlkm.img before flashing. Thank you.

    Make sure to meet the requirements and read the OP as well as the FAQ before flashing.

    I wish everybody a great day/evening!
    Have fun, enjoy the kernel and your phone.



    If you like my work please consider a donation.
    Donations are not mandatory but very welcome.
    If you like my work and want to buy me a coffee/green tea: http://paypal.me/freak07
    View
    42
    Freak07
    Freak07
    Update to Raviantha 1.0.4

    Hey guys and girls,

    So here´s the next release for stable May firmware! (although technically it should still work on April as there were no changes that weren´t already present.)
    This release is not including the bigger changes I was alluding to during my last post in this thread, but it still includes some big improvements that warrant a new release. :)
    More information below.



    Important:

    Make sure to flash the powerhint module attached to this post via magisk manager if you haven´t already done so.
    Please note that this release is not for the QPR Beta firmware or dev preview, but the stable android 13 firmware!
    Please make use magisk stable if you don´t know your way around bugs and don´t want to actively help debugging magisk development.
    You should download magisk stable only from official magisk release site!
    Latest platform tools have issues flashing super.img, please use platform tools 33.0.3 when updating your firmware

    There are other small improvements as well. Please check my github for those.

    The kernel is made for stable A13 firmware, not beta.

    I wish everyone a nice day.


    Changelog:

    - Linux-Stable bumped to 5.10.179
    - bump clang to 17.0.1 stable
    - bump f2fs-stable to latest
    - loads of improvements, bugfixes etc to memory management from latest linux main
    - improvements to memory management from 6.1 kernel common
    - improvements to MGLRU (check first post for more info about MGLRU)
    - updates/improvements to RCU from latest linux main
    - updates to lazy RCU from latest linux main
    - fixed screen-off max cpufreq restriction (thanks to @elesbb for making me aware)
    - other fixes please check github



    Download:
    Attached to release post as AFH is currently down.

    Make sure to update and keep the powerhint module installed via Magisk Manager!


    If you´re coming from another kernel restore stock boot.img, dtbo.img, vendor_kernel_boot.img and vendor_dlkm.img before flashing. Thank you.

    Make sure to meet the requirements and read the OP as well as the FAQ before flashing.

    I wish everybody a great day/evening!
    Have fun, enjoy the kernel and your phone.



    If you like my work please consider a donation.
    Donations are not mandatory but very welcome.
    If you like my work and want to buy me a coffee/green tea: http://paypal.me/freak07
    View
    41
    Freak07
    Freak07
    Update to 1.1.0

    Hey guys and girls,

    So here´s the next release. I finally feel it´s ready to be publicly released as there was not a single issue encountered over the last two weeks.
    Make sure to flash both, the kernel.zip and the powerhint magisk module!

    The kernel is now at 5.10.155 way ahead of the stock kernel. To further emphasize the importance of this. About 90% of kernel security issues are solved in linux stable.
    5.10.148 and 5.10.149 fixed the CVEs discussed here and here. Those were fixed on kernel common on November 2nd. It might take up to a few months until they trickly down into any officially shipped android kernel!
    The initial 1.0.0 release, had those CVEs fixed already as 5.10.149 was merged.
    What also needs to be kept in mind is that a big part of those security issues are resolved in linux-stable, sometimes months ago, before those patches end up in a monthly security patch. Additionally to that, the security patches on android devices are about 3 months behind the discovery of those vulnerabilities.

    This release features a few major changes, which I want to explain in greater details, so excuse the longer release post. I´d appreciate if everyone takes the time to at least read it. :)

    Introduction of Lazy RCU

    1.1.0 has the entire(!) RCU subsystem updated to latest linux 6.0 kernel state. This also allowed for Lazy RCU to be merged into the kernel, which should result in power-savings while the device is lightly-loaded or idling (which is basically the case all the time a smartphone isn´t being interacted with (nothing touching the screen and no other workload such as video editing is done).
    If you´re interested in details check the slides, which are also linked in the article I linked above.
    A very simplified explanation: RCU functionality can be called 1000s of times a second, batching RCU calls can save power by not calling as often.

    That´s one of the changes I wanted to be tested extensively, as there are a few 10000 lines of code changes.

    Please keep in mind, those are kernel changes and battery life will not be improved magically by huge amounts, due to such a change, even if the change itself is massive.
    Example: If you raise or lower the display brightness by around 10% over an entire day, you´ll see a bigger impact.
    Reading the OP gives you a good idea what this project is about! :)


    Dynamic Energy Model

    Google introduced the possibility to use different Energy Models "on the fly" a while back in the Pixel 6 and Pixel 7 kernel.
    I played around with this during the last few weeks and ironically Google did something similar in the QPR A13 Beta when I checked the firmware dump. Google switches to a different Energy Module while taking Videos. Based on my understanding to control heat better during video recordings.

    However I had another idea, but the mechanism I use to switch the profiles taps into the same system.
    While the device is idle, a different Energy Model is used, compared to when interaction is happening.
    While interaction is happening there are many boosts in play already to bias tasks to get executed as quickly as possible anyway. But switching to a different energy model allows us to basically bias tasks to get even more prominently scheduled to the little and middle cores. Since the mid cores are a78 on p7 and way more energy efficient, this should give as a double positive effect. As during idle state there are no boosts active the scheduler can now freely decide how to use EAS to the best to place the tasks as efficiently as possible.
    The energy module was tuned, so the scheduler prefers little and mid cores during idle. (nothing touching the screen, watching videos, listening to music, reading websites etc.)

    Additionally to this I decided to include the changes Google did on A13 QPR Beta while taking video to also include already in the kernel.

    Powerhal

    Switch between default and idle energy model on device is being interacted with / device idle.
    Reduce missed frames during scrolling/device interaction by adjust uclamp boosts.
    Dynamically adjust target load for memory interface during interaction.
    Remove dynamic GPU policy change as it´s causing instability and is unneeded due to GVFS period
    Implement handling during video recording of CPU like Google did on QPR A13 stable
    Raise minfreqs during screen off to 1,4ghz


    Playback over USB C to 3.5mm Dongles
    Some users were experiencing issues while using usb-c to 3.5mm dongles while running my kernel. After a long time I finally discovered how to reproduce the bug as the logs did not point towards any kernel error. It happens only if default usb configuration in developer options is set to anything else than "no data transfer". If "no data transfer" is selected there´s no issue at all.
    A few commits from linux-stable for the usb dwc3 driver breaks playback when screen is shut off or cycling through the "default usb configuration" settings, which causes the aoc driver that´s responsible for playback to shut down.
    Reverting those commits fixes the issue.

    Thanks to @WhoIsJohnGalt1979 and @Hurt Copain for nagging me about the issue and providing logs, I finally found a way to reproduce the issue so I was able to debug it.

    Given that playback is "glitchy" (a brief audio stutter) on stock kernel as well, when either cycling through different "default usb configuration" settings or turning screen on/off, that driver is generally very wonky. A user told me however that this glitch is solved in QPR Beta. So that´s good to hear if that´s the case.


    Other improvements
    Several other improvements from kernel/common (for higher branches than 5.10) and linux-main were backported to this branch so we can benefit from those improvements. For details please check my git.


    I´d like to write all of this with more detail, but at the moment I lack the time to do so.

    Kernel is compiled for stable A13, not A13 QPR Beta!


    I wish everyone a nice day.


    Changelog:

    - Linux-Stable bumped to 5.10.155
    - Backport entire RCU subsystem to linux 6.0
    - - Lazy RCU which should result in power-savings while the device is lightly-loaded or idling, more information here
    - Dynamic Energy Models depending on device state
    - Fix audio playback stopping for some users when turning screen off (thanks for @WhoIsJohnGalt1979 and @Hurt Copain for nagging me about the issue and providing logs)
    - improve CPU throttling behaviour by backporting a QPR Beta change
    - improvements to MGLRU
    - improvements from linux-mainline for several subsystems
    • scheduler
      • 02595c9fb4ec sched/core: Fix comparison in sched_group_cookie_match()
        407e4ccbb158 sched/fair: Move call to list_last_entry() in detach_tasks
        0ea56a65b686 sched/fair: Cleanup loop_max and loop_break
        0461c9736ec2 sched/fair: Make sure to try to detach at least one movable task
        f2489ca21b11 sched/fair: Cleanup for SIS_PROP
        5a3074a7ac79 sched/fair: Default to false in test_idle_cores()
        bb95868debb0 sched/fair: Remove useless check in select_idle_core()
        50112e040e6a sched/fair: Avoid double search on same cpu
        2457687f35d3 sched/fair: Remove redundant check in select_idle_smt()
    • memory management
      • 6bf69138a12b mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *
        9819fcefb782 mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t *
        997cdba71861 mm: add vma_lookup(), update find_vma_intersection() comments
        eb1eccad20cb mm/page_alloc: fix obsolete comment in deferred_pfn_valid()
        1f30d4f3fb20 mm/page_alloc: remove obsolete gfpflags_normal_context()
        17dd220de848 mm/page_alloc: use costly_order in WARN_ON_ONCE_GFP()
        4d7be8d8d6d4 mm/page_alloc: init local variable buddy_pfn
        521b49f4067c mm/page_alloc: use helper macro SZ_1{K,M}
        9838ea6feaee mm/page_alloc: use local variable zone_idx directly
        d049e3821e8b mm/page_alloc: add missing is_migrate_isolate() check in set_page_guard()
        5dc1c3c60469 mm: remove obsolete pgdat_is_empty()
        55e89c7708e3 mm/page_alloc: fix freeing static percpu memory
        bd801ed8eace mm/page_alloc: add __init annotations to init_mem_debugging_and_hardening()
        ce00e122335e mm/page_alloc: remove obsolete comment in zone_statistics()
        cc20df37215b mm: remove obsolete macro NR_PCP_ORDER_MASK and NR_PCP_ORDER_WIDTH
        97e15d20dd79 mm/page_alloc: make zone_pcp_update() static
        f7425d856d30 mm/page_alloc: ensure kswapd doesn't accidentally go to sleep
        236a9831f7e4 mm: add merging after mremap resize
        bd1537226f30 mm: mremap: fix sign for EFAULT error return value
        4fe39974c254 mm/mremap: avoid unneeded do_munmap call
        3983a53d85a6 mm/mremap:: use vma_lookup() instead of find_vma()
        b832f38c3630 mm, hugepages: add mremap() support for hugepage backed vma
        23aa8d328a4c mm/mremap: allow arch runtime override
        b029910a3ec8 mm/mremap: use pmd/pud_poplulate to update page table entries
        53093a2f034d mm/mremap: don't enable optimized PUD move if page table levels is 2
        c7b8580c66ff mm/mremap: convert huge PUD move to separate helper
        d7e1ce9e582e mm/mremap: fix memory account on do_munmap() failure
        a2a195324435 mm/mremap: use vma_lookup() in vma_to_resize()
        7f87797e053b mm/mremap: don't account pages in vma_to_resize()
        bbebb360b5e2 mm: forbid splitting special mappings
        9fce5b920e9d mremap: check if it's possible to split original vma
        089557da4960 vm_ops: rename .split() callback to .may_split()
        c180d1867972 mremap: don't allow MREMAP_DONTUNMAP on special_mappings and aio
        e7404be1ba61 mm/mremap: for MREMAP_DONTUNMAP check security_vm_enough_memory_mm()
        5bae8c6fbfff mm/mremap: account memory on do_munmap() failure
        281904d82593 mm: refactor of vma_merge()
    • PSI
      • d95535a6cabf sched/psi: Fix periodic aggregation shut off
        73abf1a6b993 psi: dont alloc memory for psi by default
        UPSTREAM: psi: Fix psi state corruption when schedule() races with cgroup move
        df3995427bf1 sched/psi: Remove unused parameter nbytes of psi_trigger_create()
        feb99cdbd69e psi: Fix PSI_MEM_FULL state when tasks are in memstall and doing reclaim
        83fc90cd1a63 psi: Reduce calls to sched_clock() in psi
        f6af1db49cbd psi: Optimize task switch inside shared cgroups
        317f29565dd3 psi: Pressure states are unlikely
        7e17bae683a3 psi: Use ONCPU state tracking machinery to detect reclaim
        118d212fd15e psi: Add PSI_CPU_FULL state
    • more details please check github
    - patches to f2fs
    - increase priority of GPU work
    - binder fix
    - updates from kernel/common to several subsystems
    - tweak powerhal for improved performance/efficiency
    • Switch between default and idle energy model on device is being interacted with / device idle.
    • Reduce missed frames during scrolling/device interaction by adjust uclamp boosts.
    • Dynamically adjust target load for memory interface during interaction.
    • Remove dynamic GPU policy change as it´s causing instability and is unneeded due to GVFS period
    • Implement handling during video recording of CPU like Google did on QPR A13 stable
    • Raise minfreqs during screen off to 1,4ghz


    Download:
    Attached to release post as AFH is currently down.
    I´ll push to AFH once it´s back up.

    Make sure to update the powerhint module via Magisk Manager!


    If you´re coming from another kernel restore stock boot.img, dtbo.img, vendor_kernel_boot.img and vendor_dlkm.img before flashing. Thank you.

    Make sure to meet the requirements and read the OP as well as the FAQ before flashing.

    I wish everybody a great day/evening!
    Have fun, enjoy the kernel and your phone.



    If you like my work please consider a donation.
    Donations are not mandatory but very welcome.
    If you like my work and want to buy me a coffee/green tea: http://paypal.me/freak07
    View

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