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Commit 3a9b8aef authored by Li Li's avatar Li Li
Browse files

Freezer: check freeze binder ioctl 

Some old kernels don't have the necessary binder ioctls for freezer
(BINDER_FREEZE & BINDER_GET_FROZEN_INFO). In such a case, disable
freezer with a warning log.

Bug: 199803449
Test: confirm freezer is enabled/disabled on new/old kernels
Change-Id: I9e19515746d4c415dc5eb871e2d3e232c0876a15
parent b7c776aa

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

+7 −3
Original line number Diff line number Diff line
@@ -645,21 +645,25 @@ public final class CachedAppOptimizer { 
            char state = (char) fr.read();



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

                // Also check freezer binder ioctl

                getBinderFreezeInfo(Process.myPid());

                supported = true;

            } else {

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

            }

        } catch (java.io.FileNotFoundException e) {

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

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

        } catch (RuntimeException e) {

            Slog.w(TAG_AM, "unable to read freezer info");

        } catch (Exception e) {

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

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

        }



        if (fr != null) {

            try {

                fr.close();

            } catch (java.io.IOException e) {

                Slog.e(TAG_AM, "Exception closing freezer.killable: " + e.toString());

                Slog.e(TAG_AM, "Exception closing cgroup.freeze: " + e.toString());

            }

        }