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if (curSchedGroup == ProcessList.SCHED_GROUP_TOP_APP) { // do nothing if we already switched to RT if (oldSchedGroup != ProcessList.SCHED_GROUP_TOP_APP)

{ app.getWindowProcessController().onTopProcChanged();

if (mService.mUseFifoUiScheduling) { // Switch UI pipeline for app to     

SCHED_FIFO

state.setSavedPriority(Process.getThreadPriority(app.getPid()));      mService.scheduleAsFifoPriority(app.getPid(), true);

if (renderThreadTid != 0) {

    mService.scheduleAsFifoPriority(renderThreadTid, /* suppressLogs */true);      if (DEBUG_OOM_ADJ) { Slog.d("UI_FIFO", "Set RenderThread (TID " + renderThreadTid + ") to FIFO"); } } else {

    if (DEBUG_OOM_ADJ) { Slog.d("UI_FIFO", "Not setting RenderThread TID"); } } } else { // Boost priority for top app UI and render threads setThreadPriority(app.getPid(), THREAD_PRIORITY_TOP_APP_BOOST);

if (renderThreadTid != 0) { try {

setThreadPriority(renderThreadTid, THREAD_PRIORITY_TOP_APP_BOOST);

} catch (IllegalArgumentException e) { // thread died, ignore } } } } }

恢复：

else if (oldSchedGroup == ProcessList.SCHED_GROUP_TOP_APP && curSchedGroup != ProcessList.SCHED_GROUP_TOP_APP) { app.getWindowProcessController().onTopProcChanged();

if (mService.mUseFifoUiScheduling) {

try {// Reset UI pipeline to SCHED_OTHER

   setThreadScheduler(app.getPid(), SCHED_OTHER, 0);       setThreadPriority(app.getPid(), state.getSavedPriority());

if (renderThreadTid != 0) {

  setThreadScheduler(renderThreadTid, SCHED_OTHER, 0);

} } catch (IllegalArgumentException e) {

  Slog.w(TAG, "Failed to set scheduling policy, thread does not exist:\n" + e);

} catch (SecurityException e) {

  Slog.w(TAG, "Failed to set scheduling policy, not allowed:\n" + e); } } else { // Reset priority for top app UI and render threads                setThreadPriority(app.getPid(), 0);

} if (renderThreadTid != 0) {

  setThreadPriority(renderThreadTid, THREAD_PRIORITY_DISPLAY);

}