Database Develop

[MOD] Disable perflock for stock kernel (2.03.405.3)

Here I put together perflock_disable update package for Legend stock kernel 2.6.29-5f084974. It is ment to disable perflock on every boot. This package consists of perflock_disable module (now licensed under GPL) from SetCPU app and boot script that loads this module.
Background:
Stock Legend's kernel has performance lock turned on. This means that (unless you recompiled your own kernel) CPU frequency scaling is somehow limited. Default limits are set from 480 to 600 MHz while screen is on and to 246 MHz while screen is off. Furthermore ondemand CPU scaling governor is limited from 246 to 600 MHz. This means you can not underclock you Legend with SetCPU unless you use perflock disable option which you have to set manually after every reboot. And here this "update" kicks in.
Requirements:
rooted Legend of course
kernel 2.6.29-5f084974
busybox
run-parts integrated in init.rc script (/etc/init.d)
Big thanks goes to coolbho3000 who now offers this module under GPL so we can use it outside his cool app.

Good post Blayo, wish it had come along earlier.
I hope more kernels will be coming along.

Sorry... how to install this ?
from ROM Manager ?

Learners Lisence said:
Good post Blayo, wish it had come along earlier.
I hope more kernels will be coming along.
Click to expand...
Click to collapse
Well this is for stock kernel. If you have your own kernel, you could have disabled perflok while you were compiling it and you wouldn't needed this module...
Vuska said:
Sorry... how to install this ?
from ROM Manager ?
Click to expand...
Click to collapse
Install it as any other update.zip via recovery mode. But you need run-parts in your init.rc, otherwise the module won't load.
I also compiled cpufreq governor modules (conservative and powersave) for stock kernel if anyone is interested...

But you need run-parts in your init.rc, otherwise the module won't load.
Click to expand...
Click to collapse
How to do this ?

This is beyond the scope of this tread. You can try Chef Central but to be honest, if you don't know what this is or how it is done, then this (Android Development) is perhaps not the right forum for you.

BlaY0 said:
Well this is for stock kernel. If you have your own kernel, you could have disabled perflok while you were compiling it and you wouldn't needed this module...
Click to expand...
Click to collapse
Yes, Blayo. I flashed the 806 kernel by dumfuq a week back. Im quite happy with it so far but would like to experiment with more Legend compatible kernels.
I read around a bit and then decided that underclocking and battery save could be achieved by a overclock kernel designed for 'performance' ....kinda like 'having the cake and eating it too"
Nevertheless, I appreciate the ideas associated with your present and possible future shares.
Thanks

Learners Lisence said:
I read around a bit and then decided that underclocking and battery save could be achieved by a overclock kernel designed for 'performance' ....kinda like 'having the cake and eating it too"
Click to expand...
Click to collapse
Yes of course. Those custom kernels don't have enabled perflock so you can set speed by using SetCPU without loading perflock_disable module.
Well, if I'm frank I have never been fond of overclocking. My goal is just to extend the battery life of these "hungry" devices as much as possible without affecting user experience.
Right now I'm testing conservative governor and have some problems, because SetCPU can't handle switching between governors as it should.
Cheers,

BlaY0 said:
This is beyond the scope of this tread. You can try Chef Central but to be honest, if you don't know what this is or how it is done, then this (Android Development) is perhaps not the right forum for you.
Click to expand...
Click to collapse
I'll try to search about chef central and i am very new in linux OS.
but thank you...
I will learn because i have legend and i like it

Good for you
Chef Central is a subforum her on xda-developers...

Thanks, nice work, i'm send you p.m. with a consulting.

what is the "run-parts integrated in init.rc script (/etc/init.d)" ?
and how about other kernel versions ?

mr.antooan said:
what is the "run-parts integrated in init.rc script (/etc/init.d)" ?
Click to expand...
Click to collapse
A way of running shell scripts at boot time in sequential order...
mr.antooan said:
and how about other kernel versions ?
Click to expand...
Click to collapse
What other kernel versions? Almost any custom kernel does not use perflock hence no need for perflock disable module...

Just to let you know guys... SetCPU 2.0.3 now supports perflock disable set on boot, so there is actually no need for this script any more...

[Q] what's Kernel???

Here's a dumb question... I thought a kernel is incorporated with a certain rom. But when i read thru the dev thread, it sounds like there are different version of kernels and we can install different Kernels to different roms??? What exactly do the Kernels do? What would make the differences? Thanks in advance.

Kernels control the resources and filing system of the phone. Different kernels have different lag fixes, some over clock the processor. Some kernels re-orientate roms so i9000 roms work on the captivate.

He also makes some kick ass chicken. Sorry, couldn't help myself.
http://en.wikipedia.org/wiki/Kernel_(computing)

mcord11758 said:
Kernels control the resources and filing system of the phone. Different kernels have different lag fixes, some over clock the processor. Some kernels re-orientate roms so i9000 roms work on the captivate.
Click to expand...
Click to collapse
So, would you say the kernel makes a rom work on a specific phone ???

minlee85 said:
So, would you say the kernel makes a rom work on a specific phone ???
Click to expand...
Click to collapse
In some cases but they accomplish more then that

minlee85 said:
So, would you say the kernel makes a rom work on a specific phone ???
Click to expand...
Click to collapse
Android relies on Linux version 2.6 for core system services such as security, memory management, process management, network stack, and driver model. The kernel also acts as an abstraction layer between the hardware and the rest of the software stack.

vorkKernel-OC/UV Kernel for CM[20111105]

Hi. The following kernel is presented to you by
vorkKernel Team:
- kiljacken
- Benee​
Click to expand...
Click to collapse
This kernel is for Cyanogenmod and Miui. *Could* be incompatible with latest kangs or nightlies (after a kernel update from CM team). No support for stock or mcr...
It's incompatible with MIUI and CM Builds before #177
New vorkKernel Twitter Bot: Here
First I want to make clear that all credit goes to aremcee/arcee/rmcc (man so many nicks ). He did an awesome job with the kernel.
I just tweaked it a little bit to my needs.
Features:
uv/oc support. OC up to 1,5GHz (With E-Peen version)
AVP/System/RAM/GPU OC with E-Peen version
1,2 Ghz for batt safe version.
Special tweaked (working!) Performance and Powersave Govenors which don't lock the freq to one level (they choose between 3-4 Freq steps)
It's even possible to set max/min clock via setcpu or CMSettings!
Voodoo sound. Thanks supercurio! So awesome
Default IO-Sched is Deadline with a special flash storage tweak
Slub allocator
tweaked CFS cpu sched (Low latency)
compiled with a tweaked toolchain (base linaro gcc - optimized for tegra2)
VFP optimizations (vfpv3-d16) and overall compiler optimizations
flags! (more below in the flag section)
A App for easy downloading and configuring. Credits to kiljacken!
Click to expand...
Click to collapse
The standard part:
I'm not responsible for melted phones or something like that...
The camera is unstable with E-Peen mode (due to AVP OC). After a reboot it needs to stabilize a few minutes (so you break it with every reboot again). Same for Bluetooth. Please don't report a problem regarding this. It's known and can't be fixed.​
Click to expand...
Click to collapse
And the source code here.
Download (Market)
Credits to kiljacken for this awesome app! You need OI File Manager for the app (Comes with CM)!
(and if you refuse to use the app - or the app is refusing to work with you: here)
Only change something, if you want to enable OC - No need to touch anything else (like govenors, schedulers)​
What are flags and how can I use them?
I recommend to use the App kiljacken made, because it's super easy for you guys. If you not want to use the app *sadpanda* then you can click this link. This is the file the app is fetching to generate the UI.
The layout is following:
Available for following device/Element style (more below)/the flag you need to add/Flag name in App/Description for general Flag/Choice name in app/actual value you need to add after flag name
If the last two points are added you first enter the flag name and than the value. For example: density230
You connect the flags with a: -
Example: -camera-ring ...
The script is configured to detect flags after vorkKernel-VERSIONNUMBER. So you can add some flags after this.
Element style
c = Checkbox
l = List you can choose things from
e = you can enter your own value​
Click to expand...
Click to collapse
Error Reporting Guide
Start with rebooting, if that doesn't help, reflash CM and then the kernel, and check again. If you're using the updater app (make sure you have the latest version), use the error report function (and describe what you're problem is). If you're not using the app, then post what flags you are using, along with what your problem is.​
Click to expand...
Click to collapse
Additionally I just want to point out that I'm not doing this as a fulltime job, so don't expect daily updates or something like that. I will try to fix a problem as fast as possible but in some cases it can take a while.
If you want to support me you can sign up on dropbox via my referral link or just push this nice thanks button .. If you want to donate you can donate to aremcee/arcee/rmcc something. I'm learning C and linux and vorkKernel is my learning project and it is a hobby for me. Anyway if you still want to support a poor student, I have a link in my signature
Thanks to:
arcee + the whole CM Team
morfic for all the avp oc tweaks and other stuff
thalamus (for saving me going crazy with the toolchain )
Erasmux
All guys that made pull request and contributed in any possible way
Donators to our project (app or kiljacken's donate link)
the android community
and a very big thanks to b3ndech0 for his buildbox.

Thanks, this is very much appreciated

This kernel is amazing! Nice work with the filename flags. It's brilliant! This way we don't have to have the same setup, but can enjoy both CM7 and the kernel.

sibbor said:
I'll try this kernel later. Will wait for CM7 getting more optimized for our devices first. 2000 Quadrant scores out of the box just don't cut it - I don't want to overclock to 1.4 GHz just to reach speeds of MCR FR14 ;-)
Planning on including any changes from kholk?
Click to expand...
Click to collapse
More things will be in it soon. And Quadrant doesn't matter. CM feels better in normal use (except a few problems but it is a really good starting point).

Benee said:
More things will be in it soon. And Quadrant doesn't matter. CM feels better in normal use (except a few problems but it is a really good starting point).
Click to expand...
Click to collapse
Yes I know it doesn't really matter. Although, generally speaking, higher scores means the software is more optimized to the hardware; framework, kernel and/or drivers.
CM7 should be able to smash the performance out of the LG stock ROM without problem...
Thanks for you kernel additions! Subscribed to this thread now so I can follow your progress.

is this kernel for a stock rom?
thanks

sibbor said:
Yes I know it doesn't really matter. Although, generally speaking, higher scores means the software is more optimized to the hardware; framework, kernel and/or drivers.
CM7 should be able to smash the performance out of the LG stock ROM without problem...
Thanks for you kernel additions! Subscribed to this thread now so I can follow your progress.
Click to expand...
Click to collapse
Nah. You can boost quadrant to oblivion via data2ext for example on desire/nexus but it didn't helped in real life performance. The sql sync disable doesn't help with real usage, but boost quadrant etc. So many things which doesn't improve real usage, boost quadrant. Like deleting your /system (pro move...).
But yeah in some parts you are right and optimizing drivers boost it too + help real use performance, so I will do this too.
vekkio said:
is this kernel for a stock rom?
thanks
Click to expand...
Click to collapse
Really? Just read the title: vorkKernel-OC/UV Kernel for CM. For Cyanogenmod. Not stock...

seems the IO from quadrant score still low, is it same sqlite hack with paul that one?

emprize said:
seems the IO from quadrant score still low, is it same sqlite hack with paul that one?
Click to expand...
Click to collapse
yup. patched cm, then compiled this and added it to update.zip.

vekkio said:
is this kernel for a stock rom?
thanks
Click to expand...
Click to collapse
Haaahaa yeah u flash away hahahahha
EDIT:- No only joking
DONT PEOPLE READ

ok, flash this kernal and using cm7 oc to 1.4, quadrant get 31xx
edit : fail to exec smartbench

Benee any chance you could add the OC support to the CM settings?
Sent from my LG O2X CM7 Nightly

svceon said:
Benee any chance you could add the OC support to the CM settings?
Sent from my LG O2X CM7 Nightly
Click to expand...
Click to collapse
Yep but this would break pimp my cpu support and I think pimp my cpu is the better deal. A easy user interface with undervolting support. Awesome! .. so no I won't add it to cm settings

Awesome OC in CM7 makes it even better

I know I'm going to get flamed for this but how do you o/c once you have flashed the kernel? when i open setCPU its already at the max 1g when i go to the CM settings there's no frequencies to select in the cpu management option
is it different on the tegra chips as opposed to qualacom?

sibbor said:
Planning on including any changes from kholk?
Click to expand...
Click to collapse
Ok if I understand the changelog from kholk correct, most of the changes are already included (don't know exactly because he didn't copied the commit names and sums the function up). One commit isn't in it because it introduced the graphic glitches. vfp3-d16 support and compiler optimization will be added with next update. Then most things are in it.

spences10 said:
I know I'm going to get flamed for this but how do you o/c once you have flashed the kernel? when i open setCPU its already at the max 1g when i go to the CM settings there's no frequencies to select in the cpu management option
is it different on the tegra chips as opposed to qualacom?
Click to expand...
Click to collapse
Is stated in the OP:
So I compiled it with uv/oc support via pimp my cpu.
Click to expand...
Click to collapse
Pimp My CPU can be downloaded from here: http://forum.xda-developers.com/showthread.php?t=1018411

spences10 said:
I know I'm going to get flamed for this but how do you o/c once you have flashed the kernel? when i open setCPU its already at the max 1g when i go to the CM settings there's no frequencies to select in the cpu management option
is it different on the tegra chips as opposed to qualacom?
Click to expand...
Click to collapse
Nah no flaming . You need pimp my cpu for it. Cpasjute did some kernel hacks to enable oc and add a uv function. That means you can undervolt without compiling the kernel again. Unfortunatly it isn't compatible with setcpu..

The kernel seems ok; I tried OC till 1200 with 50-100 UV (depending on OC).
What's very good with CM7 (and this kernel) is battery life, 30-40% more compared with Modaco ROM (till FR14).
Anybody have tried higher frequencies (1300-1400)?
Thanks a lot.

lukemo said:
The kernel seems ok; I tried OC till 1200 with 50-100 UV (depending on OC).
What's very good with CM7 (and this kernel) is battery life, 30-40% more compared with Modaco ROM (till FR14).
Anybody have tried higher frequencies (1300-1400)?
Thanks a lot.
Click to expand...
Click to collapse
I have been using this all day running 1300Mhz @ 1200mV - normal use with wifi on - 84% battery left after ap. 12 hours

[Kernel] Battery saver kernel

Update
Here is an easier solution that doesn't require flashing.
Please use this for any new ROMs from now on.
Old solution ONLY FOR 5.10.8 and 5.10.16
This is a stock miui kernel from 5.10.8, with modified ramdisk to limit CPU frequency.
This is a test I made for myself to see how much it helps in battery time to limit the CPU. I'm sharing this, because others might be interested in it.
You need to have MIUI 5.10.8 or 5.10.16. Older versions are not fully compatible. (Vibration not working)
So, finally we have custom kernels?
No, the proper kernel source is not available yet, the kernel image is still untouched.
Will there be new versions?
Probably, as there are other possible ramdisk tweaks that can achieve better battery life.
How much this can help?
I didn't have the time for a long test yet, I hope there are some users here who are willing to compare the results with the factory kernel.
But I can make some points:
This won't help much with standby time, as the frequency there is already much more limited.
This will help the most in situations where the CPU is the biggest drainer, like games.
Is this going to slow down my phone?
Theoretically, it will be slower. However in real life usage, I can't tell the difference.
Why wouldn't you just use an app like SetCPU?
None of those apps I tried have worked.
Can this be done without flashing a new kernel?
Yes, you only have to update the frequency in KHz in /proc/cpufreq/cpufreq_limited_max_freq_by_user.
For example (with root privileges):
Code:
echo '1500000' > /proc/cpufreq/cpufreq_limited_max_freq_by_user
However, this will reset after a reboot.
The attached file can be flashed under recoveries. TWRP tested.
Or you can extract the boot.img, and flash it in fastboot.
xm_kernel.zip will limit the CPU at 1.5GHz.
xm_kernel_1200 will do 1.2GHz.
Version 2 will do the trick Ched666 suggested, thus reducing the time spent at maxfreq.
Version 3 will not disable the touch boost, instead it will replace perfservscntbl.txt with boost to 1183MHz and 2 cores.

Reserved

Looking forward results and tests.

Flashed on 5.9.24
Work perfect. Only one problem... Vibro is gone Both Incall and feedback

Bakumatsu said:
Flashed on 5.9.24
Work perfect. Only one problem... Vibro is gone Both Incall and feedback
Click to expand...
Click to collapse
Thanks for the heads-up. You probably need 5.10.8 for that to work.

I know. I just a flashagolic

ill be testing this later..nice work buddy

Test on miui 5.10.8, it works!
And later manually change value to 1200000, works without lag. But after reboot maxfreq reset to 1500000.
Can you make the same kernel, but with maxfreq 1200000?

Xmister said:
No, the proper kernel source is not available yet, the kernel image is still untouched.
Click to expand...
Click to collapse
isn't this the kernel source code: https://github.com/BalcanGSM/MediaTek-HelioX10-Kernel

avenant said:
isn't this the kernel source code: https://github.com/BalcanGSM/MediaTek-HelioX10-Kernel
Click to expand...
Click to collapse
That is just a basic MediaTek source, it's missing drivers and configuration for our device.

I think it is more easy to control the value by implement init.d on our device.

Xmister said:
What is this?
This is a stock miui kernel from 5.10.8, with modified ramdisk to limit CPU frequency at 1.5GHz.
This is a test I made for myself to see how much it helps in battery time to limit the CPU. I'm sharing this, because others might be interested in it.
You need to have MIUI 5.10.8. Older versions are not fully compatible. (Vibration not working)
So, finally we have custom kernels?
No, the proper kernel source is not available yet, the kernel image is still untouched.
Will there be new versions?
Probably, as there are other possible ramdisk tweaks that can achieve better battery life.
How much this can help?
I didn't have the time for a long test yet, I hope there are some users here who are willing to compare the results with the factory kernel.
But I can make some points:
This won't help much with standby time, as the frequency there is already much more limited.
This will help the most in situations where the CPU is the biggest drainer, like games.
Is this going to slow down my phone?
Theoretically, it will be slower. However in real life usage, I can't tell the difference.
Why wouldn't you just use an app like SetCPU?
None of those apps I tried have worked.
Can this be done without flashing a new kernel?
Yes, you only have to update the frequency in KHz in /proc/cpufreq/cpufreq_limited_max_freq_by_user.
For example (with root privileges):
Code:
echo '1500000' > /proc/cpufreq/cpufreq_limited_max_freq_by_user
However, this will reset after a reboot.
The attached file can be flashed under recoveries. TWRP tested.
Or you can extract the boot.img, and flash it in fastboot.
Click to expand...
Click to collapse
it show to be on maximum speed on cpu spy...why?

Jo-san said:
it show to be on maximum speed on cpu spy...why?
Click to expand...
Click to collapse
Maybe the flash wasn't successful,or you flashed over something.
This is mine, the 29 sec is during boot, until it activates.

Ched666 said:
Test on miui 5.10.8, it works!
And later manually change value to 1200000, works without lag. But after reboot maxfreq reset to 1500000.
Can you make the same kernel, but with maxfreq 1200000?
Click to expand...
Click to collapse
OP updated with 1.2GHz kernel

Xmister you really do a great job. I renember I used your kernel when my phone was still HTC one x and then I changed to use iPhone 5s ,6, and dropped few weeks ago. And then I am back to android envirnoment and still flashing your modded kernel. Many thanks for your contribution.
And BTW, I think the 1200 kHz really help in get away from the battery draining problems.

4pda users found interesting thing... When touch a screen, frequency increases to maximum.
But if write 0 to the /proc/cpufreq/cpufreq_limited_by_hevc and set read only permissions, this bug disappears. And no maximum freq when touch a screen.
I tried it, and phone is much less heat, and works at a reduced freqs.
ADD: make mod to xm_kernel 1,5 GHz with this tweak

Ched666 said:
4pda users found interesting thing... When touch a screen, frequency increases to maximum.
But if write 0 to the /proc/cpufreq/cpufreq_limited_by_hevc and set read only permissions, this bug disappears. And no maximum freq when touch a screen.
I tried it, and phone is much less heat, and works at a reduced freqs.
Click to expand...
Click to collapse
This seems working too.
OP updated with V2 kernels that do this automatically.

Xmister said:
This seems working too.
OP updated with V2 kernels that do this automatically.
Click to expand...
Click to collapse
Also made modification ))

No need to touch cpufreq_limited_by_hevc.
If you want to control the touch_boost, try this way.
Find the file in system/etc/perfservscntbl.txt
CMD_SET_CPU_CORE, SCN_APP_TOUCH is to control how many cores when touch boost.
CMD_SET_CPU_FREQ, SCN_APP_TOUCH is to set the value when touch boost.
Save after modify and reboot your device.
By @Ched6666 's way is totally disable touch_boost

v2 is compatible with 5.10.16 release?

Stock kernel vs custom kernel ?

Stock kernel vs custom kernel ?

mohnad12 said:
Stock kernel vs custom kernel ?
Click to expand...
Click to collapse
what about it? what's your real question? stock is however stock is set up, custom kernels change the CPU setup, in many differing ways. there is no one correct answer as there are many different custom kernels and setups.

simms22 said:
what about it? what's your real question? stock is however stock is set up, custom kernels change the CPU setup, in many differing ways. there is no one correct answer as there are many different custom kernels and setups.
Click to expand...
Click to collapse
I am running orignal android 6.0.1 its recommanded to install custom kernel ??

mohnad12 said:
I am running orignal android 6.0.1 its recommanded to install custom kernel ??
Click to expand...
Click to collapse
if you have issues with the stock kernel, yes. if you want root, yes. should you learn how to set up your cpu properly before changing kernels? yes. learn about the governor/scheduler, how changing them changes your cpu performance. besides that, some kernels add a few minor features as well.

Rooted but as close to stock as possible. I've always had issues with heavily tweaked custom kernels.
They have their place, but not if you wan't a solid rooted daily driver IMHO.

DaanJordaan said:
Rooted but as close to stock as possible. I've always had issues with heavily tweaked custom kernels.
They have their place, but not if you wan't a solid rooted daily driver IMHO.
Click to expand...
Click to collapse
im a well known custom kernel user, and yet I NEVER use any custom kernel as they are set up by the developer. I ALWAYS use my own CPU setups, always. as far as I can tell, my setup is as solid for me as any stock kernel that google provides. but not only solid, my phones performance is kicked up a notch as well as its battery life. and my devices turn out much more responsive too.

Wow you must be very skilled and talented!
Sometimes messing with stuff like that can create bootloops and random freezes.
I also love how you have contributed to this thread by saying how you ALWAYS use your own CPU setups.
It was very informational an helpful.
Thanks!

DaanJordaan said:
Wow you must be very skilled and talented!
Sometimes messing with stuff like that can create bootloops and random freezes.
I also love how you have contributed to this thread by saying how you ALWAYS use your own CPU setups.
It was very informational an helpful.
Thanks!
Click to expand...
Click to collapse
and that's why its very important to know about governors and schedulers.
here's one of my examples.. for a long time, I was the only one using all 4 cores on , no hotplugging. and many people laughed at me about it, claiming my battery life must suck. but, for android 5.1 google changed the CPU settings for the nexus 6. and many people really noticed about how reactive the n6 became. what did google change? they set the cpu to be always on, no hotplugging :angel:
BTW, I use the ondemand governor with the deadline scheduler. with the sampling rate for ondemand set at 15000 and the sampling rate at 98.

mohnad12 said:
Stock kernel vs custom kernel ?
Click to expand...
Click to collapse
Ribs barbecue.
---------- Post added at 10:22 AM ---------- Previous post was at 10:21 AM ----------
mohnad12 said:
I am running orignal android 6.0.1 its recommanded to install custom kernel ??
Click to expand...
Click to collapse
No. Stock just works fine.