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Commit b2f929d7 authored by Tim Murray's avatar Tim Murray
Browse files

bind android.bg in system_server to small cores 

android.bg in system_server primarily handles PSS collection, which is
not performance critical. Accordingly, bind it to little cores.

However, because threads in zygote-derived applications are only in a
single cpuset at a time, this also means the scheduling policy for
system_servershould never be reset by applyOomAdjLocked(). The only
time this happens is when system_server's ProcessRecord is first
created, and its scheduler configuration is already controlled by
init.rc. Configure the right defaults for system_server's scheduling
group so it's never modified from applyOomAdjLocked().

Test: android.bg is in background, rest of system_server is in fg
bug 70859548

Change-Id: Id8582e6d493c6b2d3390fdc45ac2396390744f06
parent d46652a2

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

+13 −0
Original line number Diff line number Diff line
@@ -3005,6 +3005,16 @@ public class ActivityManagerService extends IActivityManager.Stub 














        Watchdog.getInstance().addMonitor(this);















        Watchdog.getInstance().addThread(mHandler);

























        // bind background thread to little cores













        // this is expected to fail inside of framework tests because apps can't touch cpusets directly













        try {













            Process.setThreadGroupAndCpuset(BackgroundThread.get().getThreadId(),













                    Process.THREAD_GROUP_BG_NONINTERACTIVE);













        } catch (Exception e) {













            Slog.w(TAG, "Setting background thread cpuset failed");













        }



























    }





























    protected ActivityStackSupervisor createStackSupervisor() {










@@ -12648,6 +12658,9 @@ public class ActivityManagerService extends IActivityManager.Stub













        if (!mBooted && !mBooting















                && userId == UserHandle.USER_SYSTEM















                && (info.flags & PERSISTENT_MASK) == PERSISTENT_MASK) {













            // The system process is initialized to SCHED_GROUP_DEFAULT in init.rc.













            r.curSchedGroup = ProcessList.SCHED_GROUP_DEFAULT;













            r.setSchedGroup = ProcessList.SCHED_GROUP_DEFAULT;















            r.persistent = true;















            r.maxAdj = ProcessList.PERSISTENT_PROC_ADJ;















        }