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Commit ac1405b8 authored by Svetoslav's avatar Svetoslav
Browse files

Notify vold when to start fstrim. 

Since using the discard option for mounting an Ext4 file system
could lead to unpredictable slowdowns of I/O we will explicitly
control when to perform fstrim, i.e. discard unused blocks of the
mounted volume. We are using the idle maintenance intents sent by
the system which specify a window that one can use to perform
expensive maintenance tasks while the user does not use the device.

This change is adding a broadcast receiver for the idle maintenance
start intent to the mount services which then notifies vold when to
start fstrim.

Since fstrim will be run on a daily basis we do not expect fstrim
to be too long, so it is not interruptible. We will implement
interruption only in case we see issues.

bug:8056794

Change-Id: I1438479d2956b61b82d3a130854376f7a144aaf3
parent d8cd823f

services/java/com/android/server/MountService.java

+26 −0
Original line number Diff line number Diff line
@@ -596,6 +596,26 @@ class MountService extends IMountService.Stub 
        }

    };



    private final BroadcastReceiver mIdleMaintenanceReceiver = new BroadcastReceiver() {

        @Override

        public void onReceive(Context context, Intent intent) {

            waitForReady();

            String action = intent.getAction();

            // Since fstrim will be run on a daily basis we do not expect

            // fstrim to be too long, so it is not interruptible. We will

            // implement interruption only in case we see issues.

            if (Intent.ACTION_IDLE_MAINTENANCE_START.equals(action)) {

                try {

                    // This method runs on the handler thread,

                    // so it is safe to directly call into vold.

                    mConnector.execute("fstrim", "dotrim");

                } catch (NativeDaemonConnectorException ndce) {

                    Slog.e(TAG, "Failed to run fstrim!");

                }

            }

        }

    };



    private final class MountServiceBinderListener implements IBinder.DeathRecipient {

        final IMountServiceListener mListener;
@@ -1301,6 +1321,12 @@ class MountService extends IMountService.Stub 
                    mUsbReceiver, new IntentFilter(UsbManager.ACTION_USB_STATE), null, mHandler);

        }



        // Watch for idle maintenance changes

        IntentFilter idleMaintenanceFilter = new IntentFilter();

        idleMaintenanceFilter.addAction(Intent.ACTION_IDLE_MAINTENANCE_START);

        mContext.registerReceiverAsUser(mIdleMaintenanceReceiver, UserHandle.ALL,

                idleMaintenanceFilter, null, mHandler);



        // Add OBB Action Handler to MountService thread.

        mObbActionHandler = new ObbActionHandler(mHandlerThread.getLooper());