[MOD][Updated 6.2.12]Dual Core Mod v2.1 - Screen Profiles, Auto Tweak, and more!

=============== How was this done? ===============​

It was pretty easy, instead of modifying the kernel itself, I just modified /system/etc/init.qcom.post_boot.sh. It already sets extra parameters for the CPU and system shortly after boot. Here are the lines that I added:

Code:

echo 1 > /sys/devices/system/cpu/cpu1/online
chmod 444 /sys/devices/system/cpu/cpu1/online

What this does is it tells cpu1 to come online and then changes the permissions so user read-only so that it can't be overridden. This will be applied on every boot.

You can also verify this is working by any number of apps, but I find SystemPanel to be the best. They have a free lite version. Just download and tap on the top right where the CPU info is. You will the the CPUs changing, when it goes grey it's offline (which you won't see when using the Dual Core Mod).

aLogcat will also show you everything DCM is doing. Just apply a filter in aLogcat called DCM and it will tell you in detail what is going on.

If you want a little bit less info or want to use adb, just type su and then dcmlog and you will see what the 2nd core is doing exactly. This is updated every 1/4 second for extremely accurate results.

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=============== Requirements ===============​

• Custom recovery
• Root access (to write to /system)

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=============== How to Flash ===============​

• Download the mod below and place on your internal_sdcard or sdcard (doesn't matter, just remember where you put it!)
• Go into Settings > Power > Fast Boot and uncheck that.
• Turn the phone off. Once off, press and hold the Volume Down + Power Button until you reach the white bootloader screen
• Choose "RECOVERY" (volume down and up to move, power to select)
• Choose "Install" and locate the mod wherever you put it. NOTE: If you don't see it, make sure that either internal_sdcard or sdcard is mounted. This can be done via the "Mount" button at the main menu of TWRP. Be sure that either internal_sdcard or sdcard is checked!
• Wait until the install is finished and then tap "Reboot to System"

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=============== Dual Core Mod v2.1 (flash over any existing version) ===============​

Updated dcmhelper

• Fixed issues with cpu1 turning off when screen on
• Fixed issues with cpu1 turning on when screen off
• Added double check for cpu1 off when screen off
• Added logging to logcat

Updated init.qcomm.post_boot.sh

• Set perms of 444 on hotplug file, regardless of dcmhelper present or not

Other

• Added /system/bin/dcmlog (type su then dcmlog from terminal or adb) - Tells you current cpu1 status [0 = off, 1 = on]

=============== Dual Core Mod v2 (flash over v1) ===============​

• MANY new options!
• Added "Screen Profiles" and "Auto Tweak" script option (all located in one configurable file - /system/bin/dcmhelper) - see 2nd post for more info
• Added "Memory Optimization" option - see 2nd post for more info
• Support AT&T HTC One X
• Support T-Mobile One S
• "All-in-One" .zips - all devices supported via 1 .zip file (thanks to a very smart updater-script I wrote )

=============== Dual Core Mod v1 ===============​

• Initial release

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=============== Explanation of Mods===============
All DCMs have memory optimizations!
​

• Dual Core Mod - Full time cpu1 on
• Dual Core Mod Plus - cpu1 on when screen on, cpu1 off when screen off
• Dual Core Mod Ultimate - Same as Plus but governor is tweaked for more performance when screen on, more battery life when screen off.

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=============== Downloads ===============

Dual Core Mod v2.1 Ultimate
Dual Core Mod Back to Stock​

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=============== Credits ===============​

• Freeza for doing this on the EVO 3D where I got the idea from
• rohandhruva, remedy1419, and ewalk4866 for EXTENSIVE testing to fix issues and make DCM better

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=============== How are all supported phones in 1 zip per file? ===============​

I wrote a custom updater-script that will identify your device and automatically give you the right file needed. Just like magic

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=============== How can I monitor the 2nd core? ===============​

You can also verify this is working by any number of apps, but I find SystemPanel to be the best. They have a free lite version. Just download and tap on the top right where the CPU info is. You will the the CPUs changing, when it goes grey it's offline (which you won't see when using the Dual Core Mod).

aLogcat will also show you everything DCM is doing. Just apply a filter in aLogcat called DCM and it will tell you in detail what is going on.

If you want a little bit less info or want to use adb, just type su and then dcmlog and you will see what the 2nd core is doing exactly. This is updated every 1/4 second for extremely accurate results.

Click to expand...

Click to collapse

=============== What are the "Memory Optimizations?" ===============​

The optimizations I made are the same that I have made in viperROM. They are as follows:

echo "0,4,6,8,14,15" > /sys/module/lowmemorykiller/parameters/adj
echo "2560,4096,6144,7680,8704,10240" > /sys/module/lowmemorykiller/parameters/minfree

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This will allow better multitasking and should eliminate any issues with apps being killed off very easily.

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=============== What are the "Screen Profiles?" ===============​

The screen profiles are part of a custom script, located in /system/bin/dcmhelper. Once flashed, this .zip runs in the background to monitor screen state (uses hardly any power). When you choose a .zip with this in it, the phone won't just leave the second core always running - it will turn it off when the screen is off and on when the screen is on. This is done via this code here:

while : ; do
awake=`cat /sys/power/wait_for_fb_wake`
if [ $awake = "awake" ]; then
echo 1 > /sys/devices/system/cpu/cpu1/online
awake=
fi

sleep=`cat /sys/power/wait_for_fb_wake`
if [ $sleep= "sleeping" ]; then
echo 0 > /sys/devices/system/cpu/cpu1/online
sleep=
fi

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Pretty simple and straightforward

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=============== What is the "Auto Tweaking Script?" ===============​

The auto tweaking script is the second part of a /system/bin/dcmhelper. This part of the script will set certain governor settings based on the screen being off or on. In the viperROM version, the screen on settings are the same as in the ROM. In the other versions, the screen on settings are more set for performance. I intentionally kept the same settings in the viperROM version to make sure you get as close to the same battery life as unmodified viperROM. Here is a code snipit (from the non-viperROM version) that shows what the settings are:

ondemand_sampling_rate_awake=40000
ondemand_up_threshold_awake=80
ondemand_down_differential_awake=12
ondemand_sampling_down_factor_awake=3

ondemand_sampling_rate_sleep=80000
ondemand_up_threshold_sleep=95
ondemand_down_differential_sleep=5
ondemand_sampling_down_factor_sleep=1

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Long story short, when awake, it will check if the CPU needs to increase speed faster and in bigger steps. When asleep, it will wait longer before polling the CPU to scale up and it will take a more gradual approach to scaling up. However, you shouldn't experience any lockscreen lag.

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=============== Long Term Goals for Dual Core Mod ===============​

• Config file and script for users to set their own settings
• Profiles for battery
• Set max freq when screen off (will affect virtuous_oc daemon in viperROM, still working on that)

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plakers said:

EDIT: lol sorry, didn't see it was a flashable zip

So, flashed the ZIP, but cpu1 never comes online... The script disables it permanently? I expected a cpu1-offline under a load factor, and goes online over another load factor.

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Closed Source Project said:

Thanks very much for this mod, going to try it out right now. Some questions on my part: (1) can this put any long-term additional stress on the cpu by forcing it to work more? (2) If a ROM is updated, does the script need to be flashed again after flashing the ROM? Again, thanks a lot; will try it out now and report my findings on the LeeDroid ROM.

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Closed Source Project said:

My results: Battery seems to be better, yet performance is not so much. Both Quadrant and Antutu benchmarks show slightly lower scores than what I got right before flashing the mod. The difference is very minimal, just curious as to why it would be lacking ever so slightly. The general UI seems just as snappy as before.

Is there an app to view exactly what the CPU is doing and how many cores are running? If so, please share! Thanks.

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plakers said:

I used the modV2 with CPU/RAM/Tweaks, the full one.
Dual Core Mod v2 w/ Screen Profiles AND Auto Tweaking Script AND Memory Optimizations

And only first core is active ...

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• I dropped a few of the versions because there were hardly any downloads on it. The "3 in 1" had literally 10 times the amount of downloads as some of the other versions. Based on this, memory optimizations are included in all builds. The naming scheme has changed as well, info in the OP.
• Please use aLogcat if you want to view everything DCM is doing. Just apply a filter in aLogcat called DCM and it will tell you in detail what is going on. If you want a little bit less info or want to use adb, just type su and then dcmlog and you will see what the 2nd core is doing exactly. This is updated every 1/4 second for extremely accurate results.
• Battery life should be very good on Ultimate because of the settings I have set. If for some reason you can verify that the mod isn't working by using what I said above, please let me know. I have verified with numerous people that it works, so it could be a minor issue in the flashable .zip. I'm not anticipating any issues, but anything can happen.