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Commit 6ca459dc authored by Marco Ballesio's avatar Marco Ballesio
Browse files

freezer: switch to cgroup v2 freezer 

cgroup v2 freezer has a single hierarchy and is mounted under
/sys/fs/cgroup. Proper v2 freezer support in a system can be checked by
verifying that the file "cgroup.freeze" is present in a freezer subgroup.

Bug: 154548692
Test: manually verified that processes are frozen and unfrozen

Change-Id: Ib966a957490ec986eb14aba6492832c96e147896
Merged-In: Ib966a957490ec986eb14aba6492832c96e147896
parent 45c1b35d

core/java/android/os/Process.java

+1 −1
Original line number Diff line number Diff line
@@ -947,7 +947,7 @@ public class Process { 


    /**

     * Enable or disable the freezer. When enable == false all frozen processes are unfrozen,

     * but aren't removed from the freezer. Processes can still be added or removed

     * but aren't removed from the freezer. While in this state, processes can be added or removed

     * by using setProcessFrozen, but they won't actually be frozen until the freezer is enabled

     * again. If enable == true the freezer is enabled again, and all processes

     * in the freezer (including the ones added while the freezer was disabled) are frozen.

core/jni/android_util_Process.cpp

+2 −2
Original line number Diff line number Diff line
@@ -352,9 +352,9 @@ void android_os_Process_enableFreezer( 
    bool success = true;



    if (enable) {

        success = SetTaskProfiles(0, {"FreezerFrozen"}, true);

        success = SetTaskProfiles(0, {"FreezerEnabled"}, true);

    } else {

        success = SetTaskProfiles(0, {"FreezerThawed"}, true);

        success = SetTaskProfiles(0, {"FreezerDisabled"}, true);

    }



    if (!success) {

services/core/java/com/android/server/am/CachedAppOptimizer.java

+11 −7
Original line number Diff line number Diff line
@@ -420,25 +420,25 @@ public final class CachedAppOptimizer { 
    }



    /**

     * Determines whether the freezer is correctly supported by this system

     * Determines whether the freezer is supported by this system

     */

    public static boolean isFreezerSupported() {

        boolean supported = false;

        FileReader fr = null;



        try {

            fr = new FileReader("/dev/freezer/frozen/freezer.killable");

            int i = fr.read();

            fr = new FileReader("/sys/fs/cgroup/freezer/cgroup.freeze");

            char state = (char) fr.read();



            if ((char) i == '1') {

            if (state == '1' || state == '0') {

                supported = true;

            } else {

                Slog.w(TAG_AM, "Freezer killability is turned off, disabling freezer");

                Slog.e(TAG_AM, "unexpected value in cgroup.freeze");

            }

        } catch (java.io.FileNotFoundException e) {

            Slog.d(TAG_AM, "Freezer.killable not present, disabling freezer");

            Slog.d(TAG_AM, "cgroup.freeze not present");

        } catch (Exception e) {

            Slog.d(TAG_AM, "Unable to read freezer.killable, disabling freezer: " + e.toString());

            Slog.d(TAG_AM, "unable to read cgroup.freeze: " + e.toString());

        }



        if (fr != null) {
@@ -471,6 +471,8 @@ public final class CachedAppOptimizer { 


        if (mUseFreezer && mFreezeHandler == null) {

            Slog.d(TAG_AM, "Freezer enabled");

            Process.enableFreezer(true);



            if (!mCachedAppOptimizerThread.isAlive()) {

                mCachedAppOptimizerThread.start();

            }
@@ -479,6 +481,8 @@ public final class CachedAppOptimizer { 


            Process.setThreadGroupAndCpuset(mCachedAppOptimizerThread.getThreadId(),

                    Process.THREAD_GROUP_SYSTEM);

        } else {

            Process.enableFreezer(false);

        }

    }