استفاده از متد onLowMemory برای جلوگیری از کرش کمبود حافظه

در کلاس Application یا همون .G متدی به نام onlowMemory وجود داره که طبق گفته گوگل :

 This is called when the overall system is running low on memory, and actively running processes
 should trim their memory usage. While the exact point at which this will be called is not defined,
 generally it will happen when all background process have been killed. That is, before reaching the 
point of killing processes hosting service and foreground UI that we would like to avoid killing.You 
should implement this method to release any caches or other unnecessary resources you may be
 holding on to. The system will perform a garbage collection for you after returning from this
 method.Preferably, you should implement onTrimMemory(int) from ComponentCallbacks2 to incrementally
 unload your resources based on various levels of memory demands. That API is available for API 
level 14 and higher, so you should only use this onLowMemory() method as a fallback for older 
versions, which can be treated the same as onTrimMemory(int) with the TRIM_MEMORY_COMPLETE level.

سوال من اینکه که در زمان اجرای این متد باید چه چیزی رو فراخوانی کنیم تا تمام پروسس های اضافی رو kill کنه و نزاره برنامه کرش کنه ؟ ایا پاک کردن cache برنامه کافیه؟