android/platform/frameworks/base/nougat-release/./services/core/java/com/android/server/am/ActivityManagerService.java

       // Now determine the memory trimming  level of background processes.

       // Unfortunately we need to start at  the back of the list to do this

       // properly. We only do this if the number of background  apps we

       // are managing to keep around is  less than half the maximum we desire;

       // if we are keeping a good number  around, we'll let them use whatever

       // memory they want.

       final int numCachedAndEmpty =  numCached + numEmpty;

       int memFactor;

       if (numCached <= ProcessList.TRIM_CACHED_APPS

               && numEmpty <=  ProcessList.TRIM_EMPTY_APPS)  {

           if (numCachedAndEmpty <=  ProcessList.TRIM_CRITICAL_THRESHOLD)  {

               memFactor =  ProcessStats.ADJ_MEM_FACTOR_CRITICAL;

           } else if (numCachedAndEmpty  <= ProcessList.TRIM_LOW_THRESHOLD)  {

               memFactor =  ProcessStats.ADJ_MEM_FACTOR_LOW;

           } else {

               memFactor =  ProcessStats.ADJ_MEM_FACTOR_MODERATE;

           }

       } else {

           memFactor =  ProcessStats.ADJ_MEM_FACTOR_NORMAL;

       }

   // The maximum number of cached processes  we will keep around before killing them.

   // NOTE: this constant is *only* a  control to not let us go too crazy with

   // keeping around processes on devices  with large amounts of RAM. For devices  that

   // are tighter on RAM, the out of memory  killer is responsible for killing background

   // processes as RAM is needed, and we  should *never* be relying on this limit to

   // kill them. Also note that this limit only applies to  cached background processes;

   // we have no limit on the number of  service, visible, foreground, or other such

   // processes and the number of those  processes does not count against the cached

   // process limit.

   static final int MAX_CACHED_APPS = 32;

android/platform/packages/apps/Settings/nougat-release/./src/com/android/settings/applications/ProcStatsData.java

           if (memInfo.hiddenAppThreshold  >= realFreeRam) {

               realUsedRam = freeRam;

               realFreeRam = 0;

               baseCacheRam = (long) realFreeRam;

           } else {

               realUsedRam +=  memInfo.hiddenAppThreshold;

               realFreeRam -= memInfo.hiddenAppThreshold;

               baseCacheRam =  memInfo.hiddenAppThreshold;

           }

>adb shell cat  /sys/module/lowmemorykiller/parameters/minfree

18432,23040,27648,32256,55296,80640