[KERNEL] [G800F/M/Y] Spookcity_Kernel-N (For all 7.x custom ROMS)

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spookcity138

Senior Member
Nov 9, 2015
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Eindhoven
I activated the Low memory Killer. In aggressive Mode. Can anybody Tell me in short what is does? Better for battery or worden?
This is really more for memory management. I suppose it could have a benifit for battery as its going to kill apps faster,but I'm unsure how much. I personally don't see the need to set it to aggressive. Our device has decent enough memory,but I suppose we all do different things on our phone so it depends. My best advice: try it out for a bit and see if you notice and benefits or problems.

Sent from my SM-G800F using Tapatalk
 
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Oleggluk

Senior Member
Jul 29, 2015
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I activated the Low memory Killer. In aggressive Mode. Can anybody Tell me in short what is does? Better for battery or worden?

The higher the value, the more you deprive yourself of RAM. Usually change the last 3 items. Great value reduces multitasking. For example, if you set 300 to the last item, then the applications will start to be unloaded with a remaining memory of 300, increasing from less important to important.
 

friscoboi

Senior Member
Oct 1, 2016
494
117
The higher the value, the more you deprive yourself of RAM. Usually change the last 3 items. Great value reduces multitasking. For example, if you set 300 to the last item, then the applications will start to be unloaded with a remaining memory of 300, increasing from less important to important.

Doesnt that mean i get more RAM if Apps are being unloaded?
 

spookcity138

Senior Member
Nov 9, 2015
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Thanks - is the 1.5Ghz version still overclocking the GPU? I'm just not a fan of overclocking...:D
Well,Samsung had the 1.5ghz in their code for revision 2 and above of the CPU. It was only a matter of unlocking the frequency. So to answer your question,no the 1.5 is not technically overclocked. Samsung just decided to not use it for whatever reason.

Edit:
I now see you wrote GPU. The GPU is still overclocked (from 450mhz to 600mhz) I've yet to notice or hear from anyone about any issues with this though.

Sent from my SM-G800F using Tapatalk
 
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spookcity138

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Nov 9, 2015
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The installation fails on my G800F with
Code:
Unpacking ramdisk failed

After testing a bit more, the installationalsop fails now for v3.0. I am using trwp 3.1.1-1. Is there a known issue that I missed?

That's an interesting error that I have not seen. I know of know issues with TWRP regarding this. Hopefully doing what Oleggluk has suggested will work. If not let me know and I will try to see if I can figure out the issue.
 

elhennig

Senior Member
Feb 21, 2011
956
231
That's an interesting error that I have not seen. I know of know issues with TWRP regarding this. Hopefully doing what Oleggluk has suggested will work. If not let me know and I will try to see if I can figure out the issue.

Yes, the Oleggluk's tip worked fine in terms of flashing. Then, however I ran into my old problem with RR 5.8.3 being very fragile in terms of updating the kernel. This resulted in random reboots (warm and cold) which I am trying to solve right now.
 

spookcity138

Senior Member
Nov 9, 2015
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Eindhoven
Yes, the Oleggluk's tip worked fine in terms of flashing. Then, however I ran into my old problem with RR 5.8.3 being very fragile in terms of updating the kernel. This resulted in random reboots (warm and cold) which I am trying to solve right now.
Well I'm glad that worked. I don't know why the other issues. I've experienced none of this and I know Oleggluk is also running RR and he's not reported any real issues to me like this.

Sent from my SM-G800F using Tapatalk
 

elhennig

Senior Member
Feb 21, 2011
956
231
Well I'm glad that worked. I don't know why the other issues. I've experienced none of this and I know Oleggluk is also running RR and he's not reported any real issues to me like this.

I did a clean install (wiping system, cache and art) with only RR and open_gapps (from July). This worked well. Then I installed Magisk 13.3 and the system came up nicely, not showing any reboots or other unstable behaviour.
Now I try to install v4.0 and see what happens. I also try to clean the Kernel Adiutor settings (just in case).
 

spookcity138

Senior Member
Nov 9, 2015
1,861
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Eindhoven
I did a clean install (wiping system, cache and art) with only RR and open_gapps (from July). This worked well. Then I installed Magisk 13.3 and the system came up nicely, not showing any reboots or other unstable behaviour.
Now I try to install v4.0 and see what happens. I also try to clean the Kernel Adiutor settings (just in case).
Resetting/cleaning kernel adiutor settings is a good idea. I've experienced some strange things after flashing test versions of my kernel that I believe is related to that. Good luck! I hope all works out.

Sent from my SM-G800F using Tapatalk
 

a-dead-trousers

Senior Member
Jul 28, 2016
271
135
The installation fails on my G800F with
Code:
Unpacking ramdisk failed
After testing a bit more, the installationalsop fails now for v3.0. I am using trwp 3.1.1-1. Is there a known issue that I missed?
I did a clean install (wiping system, cache and art) with only RR and open_gapps (from July). This worked well. Then I installed Magisk 13.3 and the system came up nicely, not showing any reboots or other unstable behaviour.
Now I try to install v4.0 and see what happens. I also try to clean the Kernel Adiutor settings (just in case).
I can confirm that the kernel can not be installed, while Magisk v13.3 is installed. I had to uninstall Magisk in order to install the Kernel. After that I re-installed Magisk and everything is working as expected.
 

elhennig

Senior Member
Feb 21, 2011
956
231
I can confirm that the kernel can not be installed, while Magisk v13.3 is installed. I had to uninstall Magisk in order to install the Kernel. After that I re-installed Magisk and everything is working as expected.

For me it work after cleaning the Kernel Adiutor settings.
@spookcity138, I guess it was the zram being removed from the kernel at least it does not show up anymore in the new settings.
 

spookcity138

Senior Member
Nov 9, 2015
1,861
2,558
Eindhoven
For me it work after cleaning the Kernel Adiutor settings.
@spookcity138, I guess it was the zram being removed from the kernel at least it does not show up anymore in the new settings.
Interesting. Thanks to both of you for the info. Not much I can do about it as far as I can think. I'll look into it though. Thanks again and glad you got it sorted.

Edit:
I use Magisk 13.2 without issues, so I suppose something has changed on the Magisk side of things.

Sent from my SM-G800F using Tapatalk
 
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elhennig

Senior Member
Feb 21, 2011
956
231
Interesting. Thanks to both of you for the info. Not much I can do about it as far as I can think. I'll look into it though. Thanks again and glad you got it sorted.

Edit:
I use Magisk 13.2 without issues, so I suppose something has changed on the Magisk side of things.
I do not have any problems with the installation of the kernel after Magisk is already installed. My phone rund very stable since I did a clean install and only changed a few kernel settings.
I switched to Westwood congestion algorithm and to zen I/O scheduler. This time I did not configure alucard as governor and left hotplug untouched.
 

spookcity138

Senior Member
Nov 9, 2015
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Eindhoven
I do not have any problems with the installation of the kernel after Magisk is already installed. My phone rund very stable since I did a clean install and only changed a few kernel settings.
I switched to Westwood congestion algorithm and to zen I/O scheduler. This time I did not configure alucard as governor and left hotplug untouched.
Glad to hear all is working well. Westwood will be the default TCP congestion from the next build on. It was suppose to be on this build, but I forgot.

Edit:
Oleggluk has pointed out to me that alucard and ondemandplus do not work as they should. You can use them and they cause no issues, but they don't scale the CPU frequencies like they should. I recommend not using these until hopefully I can fix them. Alucard hotplug works properly though.

Sent from my SM-G800F using Tapatalk
 
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  • 18
    Code:
    /*
     * Your warranty is now void.
     *
     * I am not responsible for bricked devices, dead SD cards,
     * thermonuclear war, or you getting fired because the alarm app failed. Please
     * do some research if you have any concerns about features included in this kernel
     * before flashing it! YOU are choosing to make these modifications, DO NOT
     * point the finger at me for messing up your device.
     * this kernel is only for the S5 mini SM-G8OOF/M/Y (Exynos) Do Not Flash this on any other device!
     */

    19-10-2017 * Updated to v6.0 * Changes are in red or can be seen at the bottom of this post in the changelog: I am always applying patches to hopefully improve the kernel,so check out the "Patches and tweaks applied" section for a better view of the changes as well.

    Notes
    • ALWAYS read the "Known Issues" section before flashing. I will add issues I have noticed or have been told about. Some may be VERY important. If you fail to do this and experience an issue that is listed I can not help you!
    • SELinux is set to permissive in this kernel. You can change this to enforcing at boot if you wish via an app like Kernel Adiutor-Mod
    • About voltage control: Setting frequencies that are unstable are going to cause lockups,freezes and reboots. This is NOT a fault in the kernel. My suggestion is to move the voltages up or down slowly (+/- 25) until you find some stable voltages that you're happy with.
    • Enough people were having problems with the 1.6ghz overclocked version that I've decided to release a non overclocked (1.5ghz) build as well. I would recommend trying the 1.6ghz and only if you experience a bootloop or instability then use the 1.5ghz version. I will not keep older versions of the 1.5ghz build up. Only the latest.
    • Having troubles deciding on a CPU governor or an I/O scheduler? Here is an amazing guide. All credits to Saber. Be sure to hit the thanks button. He obviously put a lot of time into that.
    Features
    • Based on the latest Samsung kernel sources
    • Built an updated Sqlite3 (from version 3.9.2 -> 3.19.3 that will be pushed along with the kernel install (you can verify this by running "sqlite3 --version" in a terminal emulator before the new kernel install and then again after)
    • Compiled with self-built (ct-ng) UBERTC 8.0
    • Patched Linux to latest 3.4.113
    • Unlocked CPU frequencies: 200MHZ and 300MHZ
    • GPU overclocked to 600MHZ
    • CPU Overclocked to 1.6GHZ
    • CPU voltage control ( Max voltage =1500mV. Min voltage =600mV)
    • DriveDroid support (add sysfs entry for cdrom to LUNs)
    • Implemented zen-tune v4.5
    • Added CPU boost driver
    • Added PIE net scheduler
    • Added support for USB keyboards (You need This app)
    • Reduced vm_swappiness from 60 to 20
    • Added I/O scheduler switcher by sultanxda (changes the I/O scheduler for a specified request queue to Noop when the screen turns off in order to improve power consumption while the screen is off)
    • Added Fsync on/off
    • Added dynamic fsync
    • Added Dynamic management of dirty page writebacks (allows to have two different intervals for dirty page writebacks and to dynamically manage them when the system has been resumed (it's active) or when has been suspended - Not adjustable via Grarak's Kernel Adiutor app)
    • Proc: much faster /proc/vmstat
    • Full CIFS support ( Modules will be pushed with kernel install )
    • Introduced new flag WQ_POWER_EFFICIENT for power oriented workqueues ( Allows for power saving if selected in Kernel Adiutor ETC. )
    • Added /dev/frandom support ( It is yet to be implemented properly yet however )
    • Properly enabled faux123's powersuspend v2.5
    • Fading LED's
    • Enabled graphite
    • Enabled AIO
    • Readahead set to 512 (from 128 default)
    • Reverted "Enabled arch power" (There will be a switch to enable/disable this in the next build)
    • Many build flags for optimization
    • Added optimization flags for the GPU
    • Many more features being worked on and coming soon

    Added CPU governors
    - nightmare
    - wheatley
    - zzmoove
    - dancedance
    - darkness
    - hyper
    - lionheart
    - ondemandplus
    - bioshock
    - pegasusq
    - smartmax
    - alucard (by alucard24)
    - bluactive
    - intelliactive (by faux123)
    - intellidemand

    Added CPU hotplug governors
    - alucard hotplug (by alucard24)
    - intelliplug hotplug (by faux123)
    - thunderplug hotplug (by varun.chitre15)
    - MSM Sleeper hotplug
    - autoSMP hotplug

    Added IO schedulers
    - fiops
    - sio
    - zen
    - fifo
    - tripndroid
    - bfq-v7r8

    Added many TCP congestions
    - reno
    - vegas
    - westwood and more
    - Added the rest of the TCP congestions
    - Westwood is now default TCP


    Patches and tweaks applied include:

    - Updated ARM topology and added cpu_power driver
    - Input: Improve the events-per-packet estimate
    - block/partitions: optimize memory allocation in check_partition()
    - block: bfq-iosched: tuning for SSD (thanks to anarkia1976)
    - cpufreq: Move get_cpu_idle_time() to cpufreq.c (This is important for CPU governors to work better/more efficiently with our kernel version-3.4)
    - Fixed all the CPU governors to work properly with the Move get_cpu_idle_time
    - cpufreq: Introduce new relation for freq selection (It selects the frequency with the minimum euclidean distance to target. In case of equal distance between 2 frequencies, it will select the greater frequency)
    - cpufreq: conservative: Set MIN_LATENCY_MULTIPLIER to 20
    - cpufreq-ondemand-Set-MIN_LATENCY_MULTIPLIER-to-20
    - cpuidle-Get-typical-recent-sleep-interval
    - cpufreq: Persist cpufreq time in state data across hotplug
    - implement-LoUIS-API-for-cache-maintenance-operations
    - ARM-kernel-update-cpu_disable-to-use-cache-LoUIS-maintenance API
    - update-v7_setup-to-the-new-LoUIS-cache-main
    - USB-gadget Optimize-tx-path-for-better-performance
    - af_unix: speedup /proc/net/unix
    - net/socket.c: fix: warning: 'sock/sock1/sock2' may be used uninitialized in this function
    - fs/proc/array.c: make safe access to group_leader
    - lib/memcopy: use glibc version (the kernel's memcpy and memmove is very inefficient. But the glibc
    version is quite fast, in some cases it is 10 times faster than the kernel version)
    - lib/string: use glibc version (same as above)
    - lib/int_sqrt.c: optimize square root algorithm
    - readahead: make context readahead more conservative
    - sched-Fix-select_idle_sibling-bouncing-cow-syndrome
    - sched-Implement-smarter-wake-affine-logic
    - sched-Micro-optimize-the-smart-wake-affine-logic
    - sched: Reduce overestimating rq->avg_idle
    - power: make sync on suspend optional
    - tcp: tweaked for speed
    - writeback-fix-occasional-slow-sync
    - writeback-fix-writeback-cache-thrashing
    - wireless - bcmdhd - reduce scan dwell time to reduce power usage
    - bcmdhd reduce wakelocks
    - mutex-Queue-mutex-spinners-with-MCS-lock-to-reduce-cc
    - mutex-Make-more-scalable-by-doing-less-atomic-operations
    - ARM-use-generic-unaligned.h
    - Kconfig-enabled-unaligned-capability-for-ARM
    - decompressor-Enabled-unaligned-memory-access
    - Optimized-ARM-RWSEM-algorithm
    - ARM: Fixed negative idle stats for offline cpu
    - disabled debugfs[/COLOR]
    - mm: remove noisy remainder of the scan_unevictable interface
    CONFIG_HZ=100 (reverted commit)
    - Plus many more - Check my git repo for full details.

    Sources


    Known Issues
    • Setting alucard hotplug along with certain other governors at boot via kernel adiutor etc can cause a reboot after setting is applied. So be certain to set the "delay" time in kernel adiutor or similar to 10 seconds or more,so if you have this you are able to cancel and change after a reboot.
    • There is a chance of some settings being reset after flashing the kernel (quick setting,sound,statusbar etc.) This is rather insignificant and all settings that have been changed can be set back in minutes.

    Installation
    I HIGHLY recommend that you do a full backup before flashing this kernel. I am not responsible if you lose any or all of your data.

    1.Download "Spookcity_Kernel-N"
    2.Place the zip onto your phones storage
    3.Reboot into recovery (Volume-Up + Home + Power button)
    4.Select install
    5.Flash the downloaded kernel
    6.Go back a few times in TWRP Select wipe -> Advanced wipe and wipe Dalvik/Art cache and the cache partition.
    If you do not do this you are very likely to experience strange issues.You have been warned.Do not report problems if you did not do this.
    7.Reboot


    Code:
    Feedback can also be posted[URL="https://github.com/Spookcity/ROMS-G800F/issues/12"]-------> Here[/URL]
    Test builds will be released [URL="https://github.com/Spookcity/ROMS-G800F/issues/22"]-------> Here[/URL]

    Download the latest build

    Download older version
    Code:
    [URL="https://www.androidfilehost.com/?fid=745425885120759188"]Version 5.0[/URL]
    [URL="https://www.androidfilehost.com/?fid=889764386195920916"]Version 4.0[/URL]
    [URL="https://www.androidfilehost.com/?fid=673368273298972709"]Version 3.0[/URL]
    [URL="https://www.androidfilehost.com/?fid=889764386195913162"]Version 2.0[/URL]
    [URL="https://www.androidfilehost.com/?fid=889764386195911617"]Version 1.0[/URL]
    Huge credit and many thanks to:
    Hennymcc,Ayke,Psyafter,mirhciulica,ctxZ,DjSteve,CurtisMJ,osm0sis,Archidroid,Chet Kener,andip71,faux123,flar2,ZaneZam,anarkia1976,AndreiLux,Yank,Francisco Franco,Sultanxda,varun.chitre15

    Big thanks for testing and giving feedback:
    Oleggluk,StanleyNL,Mikahlo,Guntzog
    and any others as I'm sure I am forgetting people.

    CHANGELOG
    HTML:
    01-09-2017 - Released Version 6.0
    
    - Added MSM Sleeper hotplug
    - Reduced vm_swappiness from 60 to 20
    - Added intellidemand governor
    - Added autoSMP hotplug
    - Added CPU boost driver
    - Proc: much faster /proc/vmstat
    - Cpufreq: Persist cpufreq time in state data across hotplug
    - Reverted "enable arch power"
    - mm: remove noisy remainder of the scan_unevictable interface
    - net/socket.c: fix: warning: 'sock/sock1/sock2' may be used uninitialized in this function
    
    01-09-2017 - Released Version 5.0
    
    - Removed ROW I/O scheduler
    - Added I/O scheduler switcher by sultanxda
    - Added PIE net scheduler
    - Added support for USB keyboards
    - Properly enabled faux123's powersuspend v2.5
    - Added dynamic fsync
    - Added optimization flags for the GPU
    - Enabled AIO
    - Reverted a couple of HZ related commits
    - Added intelliactive governor
    - Added intelliplug hotplug driver 
    - Added thunderplug hotplug driver
    - Added Dynamic management of dirty page writebacks
    - Fixed voltage control on 1500MHZ version
    - Fixed alucard governor
    - Fixed ondemandplus governor
    - Fixed bluactive governor
    - ib/int_sqrt.c: optimize square root algorithm
    - af_unix: speedup /proc/net/unix
    - wireless - bcmdhd - reduce scan dwell time to reduce power usage
    - bcmdhd reduce wakelocks
    - readahead: make context readahead more conservative
    - block/partitions: optimize memory allocation in check_partition()
    - power: make sync on suspend optional
    - block: bfq-iosched: tuning for SSD
    
    05-08-2017 - Released Version 4.0
    
    - Added 1.5GHZ version
    - Added voltage control
    - DriveDroid support
    - Implemented zen-tune v4.5
    - Full CIFS support
    - Introduce new flag WQ_POWER_EFFICIENT for power oriented workqueues
    - Added Fsync on/off
    - Added ROW I/O sheduler
    - Added BFQ-v7r8 I/O scheduler for 3.4 kernel
    - Added Blu_active CPU governor
    - block: disabled add_random
    - tweaked build flags
    - many workqueue related patches
    - tcp: tweaked for speed
    - CONFIG_HZ=300
    - fs/proc/array.c: make safe access to group_leader
    - disabled debugfs
    
     19-07-2017 - Released Version 3.0
    
    -GPU overclocked to 600MHZ
    -Updated Sqlite3 to version  3.19.3 from 06-08-2017
    Added CPU governors
    -bioshock
    -pegasusq
    -smartmax
    -alucard
    -alucard hotplug
    -Added the rest of the TCP congestions
    -cpufreq: Move get_cpu_idle_time() to cpufreq.c
    -Fixed all the CPU governors to work properly with the Move get_cpu_idle_time
    -Added /dev/frandom support 
    -cpufreq: Introduce new relation for freq selection
    -lib/memcopy: use glibc version
    -lib/string: use glibc version
    -
     03-07-2017 - Released Version 2.0
    
    -GPU overclocked to 533MHZ
    Added CPU governors
    -dancedance
    -darkness
    -hyper
    -lionheart
    -ondemandplus
    Added IO schedulers
    -fifo
    -tripndroid
    Added many TCP congestions
    -reno
    -vegas
    -westwood
    -etc.
    
     26-06-2017 - Fix "unsupported device" when flashing in TWRP 3.1.1.0
    
     23-06-2017 - Initial release

    Enjoy!


    XDA:DevDB Information
    [KERNEL] [G800F/M/Y] Spookcity_Kernel-N (For all 7.x custom ROMS), Kernel for the Samsung Galaxy S5 Mini

    Contributors
    spookcity138
    Kernel Special Features:

    Version Information
    Status: Beta

    Created 2017-06-23
    Last Updated 2017-10-19
    9
    Updated to v4.0. See main post for the details.

    Enjoy!
    8
    Updated to v6.0. See main post for details
    Note: I have not had the time to look into and fix the issue that a few have with this kernel. My apologies. I will try my best to look into it soon. I just haven't had much time to work on this kernel recently. All of these commits are from 6 or so week ago so yeah.

    Enjoy!
    8
    Updated to v5.0. See main post for details.

    Enjoy!
    7
    New test build up. Hopefully some of these random reboot issues are fixed,fingers crossed. Download Here
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