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@chickendrop89 chickendrop89 released this 28 Nov 20:10
· 6 commits to android13-5.15-lts since this release
cec9028
/*
* Your warranty is no longer valid, unless you lie.
*
* I am not responsible for bricked devices, strained relationships,
* thermonuclear war, or you getting fired because the alarm app failed. Please
* do some research if you have any concerns about features included in this kernel
* before flashing it! YOU are choosing to make these modifications, and if
* you point the finger at me for messing up your device, I will laugh at you.
*
*/

A kernel carefully optimized for

  • low-memory, cpu, f2fs and scheduling performance
  • battery and power savings
Speciifically crafted for 4GB variant in mind ❤️
  • Supports tapas/topaz/sapphire/sapphiren

XDA Forums thread | SourceForge mirror

📋 Click here to see new changes introduced in this release
net:
- disabled support for syncookies to improve net performance and reduce interference

sched:
- cass: update implementation
- minor optimizations

f2fs:
- minor optimization

kernel:
- adjusted binder priority driver to reduce power consumption
- avoid dynamic memory allocations in few hot paths to improve performance
- stripped more stuff not targeting our platform to reduce kernel size
- reduced system-wide stutters
- update kernelsu implementation

compilation:
- bump clang from 19.0.0 -> 19.0.1
📋 Click here to see changelog from previous release(s)

mm: 
- mlgru: enable mlgru by default to reduce app killings in background

wakelocks:
- added boefla wakelock blocker, and blacklisted two wakelocks that are not suitable for android by default
- reduced wakelock timeouts for fingerprint and serial drivers
- add timeout to wakelocks to stop system from not entering deep-sleep at all
- alarmtimer: minimize wakeup time to reduce power consumption

sched:
- cass: add capacity aware superset scheduler (CASS) to improve single-core performance and latency
- fair: reduce PELT half-life time to increase interactivity
- core: reduce overhead and latency

net:
- set google's 'BBR' as the default TCP congestion algorithm to improve network performance
- add 'westwood' TCP congestion algorithm for users who prefer it
- use fq_codel by default

freezer: 
- reduce freeze timeout to avoid draining battery unnecessarily

iogovernor:
- added SSG I/O governor (used by samsung) and tuned it to increase throughput and reduce latency
- removed kyber and mq-deadline I/O governors as they are not used, and don't pose any advantage over existing ones

cpugovernor: 
- make 'performance' the default CPU governor to improve boot performance - this will be reverted once boot completes anyway
- blacklisted "userspace" and "ondemand" governors from loading as they are never used

mm:
- reduce swappiness to 35 since we have mlgru enabled to reduce aggressive swapping and reduce power consumption
- disable watermark boosting as it's a mess, and hurts performance on low-memory devices
- don't hog the CPU and zone lock in rmqueue_bulk to reduce system latency
- lower the non-hugetlbpage pageblock size to reduce scheduling delays
- micro-optimize PID maps
- stop kswapd when it is not needed to save resources.
- reduce measurable overhead

cpuidle: 
- add timer to stop wi-fi from staying idle to reduce power consumption
- disabled "menu" and generic arm cpuidle governors in favor of governors that are more suitable on our platform (TEO, Qcom-LPM)
- minor optimizations

f2fs:
- force fsync for better data integrity and lower data corruption risk
- reduce timeout for uncongestion to lower I/O latency
- enlarge min_fsync_blocks to 20 to improve fsync performance
- enable ATGC and GC_MERGE by default to improve efficiency of garbage collection
- disabled collection of statistics (iostat) by default to reduce latency

rcu:
- enable lazy-rcu by default to increase battery savings on idle, or low system load
- minor optimizations

arm: 
- assign unbound workqueues to LITTLE CPU cluster by default to reduce power consumption
- import new optimized strcmp from ARM (manufacturer)
- improved performance of library routines by 20%. Applied optimized arm helpers
- disable legacy 16-bit calls support to reduce kernel image size

compilation: 
- compile with clang -O3 optimizations for maximal performance
- tune our compiler specifically for sm6225-AD to achieve bigger performance improvements
- enabled the use of LLVM polyhedral optimizations 

kernel:
- enabled power-efficient workqueues by default
- disabled deprecated armv8 instruction emulation (since it is not used on our platform)
- imported binder priority driver and tuned it to prioritize common UI renderers and elements
- unselect profiling, and unrelated platform support/drivers to reduce kernel size 
- unselect unneeded errata workarounds not affecting our SoC to improve performance
- stripped out assembler symbols, and miscellaneous debugging to reduce kernel size
- build `ZRAM` and `ZSMALLOC` modules into the kernel image, as most of the time, the external modules are outdated

debug: 
- binder: disable debugging and logging prints to reduce wasted cycles
- arm64: disable self-hosted debug by default

merged:
- CAF (Qualcomm) changes
- Xiaomi changes

This is a stable 5.15 release built with latest clang-19.0.1 (-O3 and polyhedral optimizations)

Installation guide:

  1. Download the kernel zip below
  2. Use FKM flasher, or reboot to recovery and install it
  3. Enjoy

Credits

⚠️ Report any bugs and problems here

⚠️ SuSFS is experimental, and might cause perfrormance degradation or security risks.

Please, if you Ctrl-C + Ctrl-V my kernel, at least provide some credit for my efforts

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