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Apr 30, 2024 · The Android low memory killer daemon ( lmkd) process monitors the memory state of a running Android system and reacts to high memory pressure by killing the least essential processes to keep the system performing at acceptable levels.
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Discussion. Starting with Android 12 the low memory killer is in the user space instead of the kernel. The kernel managers can no longer configure the low memory killer levels like before. Has anyone found a way to tune the new low memory killer daemon ? I'm having issues with the LMK on my Pixel 4XL.
Android Low Memory Killer Daemon (lmkd) is a process monitoring memory state of a running Android system and reacting to high memory pressure by killing the least essential process (es) to keep system performing at acceptable levels.
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lmk主要是为了在Android系统内存严重不足的时候，通过杀进程扩充系统内存，以保障用户关心的app能正常运行。 lmk杀进程需要确保两点： 尽量少杀进程，后台尽量保留多个应用。 这样在用户切换app时速度会较快，有较好的用户体验。 内存也要尽量回收足够，以保证前台应用能流畅运行。 所以lmk要在两点之间找到平衡。 主要框架与流程. lmkd存在于用户空间。 lmkd需要从system server了解到最新的proc信息，proc开始或者结束，proc的oomadj是否发生变化。 同时lmkd又需要从kernel获取当前内存压力变化，最新版本通过mem psi实现监听。 也可以通过memcg的vmpressure实现监听。 lmkd的流程包括如下三步：
