commit acff43dca6a3c8a29f449706967d4de21c373d26
author Tim Murray <timmurray@google.com> Fri Jul 29 13:57:24 2016 -0700
committer Tim Murray <timmurray@google.com> Fri Jul 29 14:25:21 2016 -0700
tree 7c3b1db6bd9f477369ec689ff8017e656b2afa16
parent ba5c79ab9857deb9c57192d1cad4d63c83d51772

Update SurfaceFlinger FIFO configuration.

- move SurfaceFlinger main thread to prio 2
- drop EventThread from FIFO but not SFEventThread, which is still FIFO
prio 1
- make DispSyncThread FIFO, prio 1

bug 30481949

Change-Id: Ifedccfbf3cf144ffad030109849a924dddae8d09

services/surfaceflinger/DispSync.cpp

diff --git a/services/surfaceflinger/DispSync.cpp b/services/surfaceflinger/DispSync.cpp
index 37b6420..c67feb3 100644
--- a/services/surfaceflinger/DispSync.cpp
+++ b/services/surfaceflinger/DispSync.cpp
@@ -383,6 +383,13 @@
         mThread(new DispSyncThread(name)) {
 
     mThread->run("DispSync", PRIORITY_URGENT_DISPLAY + PRIORITY_MORE_FAVORABLE);
+    // set DispSync to SCHED_FIFO to minimize jitter
+    struct sched_param param = {0};
+    param.sched_priority = 1;
+    if (sched_setscheduler(mThread->getTid(), SCHED_FIFO, &param) != 0) {
+        ALOGE("Couldn't set SCHED_FIFO for DispSyncThread");
+    }
+
 
     reset();
     beginResync();