性能测试指标

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