commit ba8a47531c5ebc5e1322088354d2114f6892f3fd
author Todd Kjos <tkjos@google.com> Mon Oct 26 16:22:11 2015 -0700
committer Todd Kjos <tkjos@google.com> Mon Nov 16 14:57:47 2015 -0800
tree 6452bfaa0c157968b6f1e97ab320d48e14fd96b6
parent 2a3024f9ad923b5bb531804bb92d486635c1d24c

Actively mangage EAS schedtune nodes

Move foreground tasks to /sys/fs/cgroup/stune/boost/tasks (boosted
weight in EAS scheduler). Move background tasks to
/sys/fs/cgroup/stune/tasks (default weight). For services started
with init, set "foreground" services to boosted.

Change-Id: I0e489fad9510727c13e6754dabaf311c2391f395

libcutils/sched_policy.c

diff --git a/libcutils/sched_policy.c b/libcutils/sched_policy.c
index 298e3da..6bba3a7 100644
--- a/libcutils/sched_policy.c
+++ b/libcutils/sched_policy.c
@@ -64,6 +64,8 @@
 // File descriptors open to /dev/cpuset/../tasks, setup by initialize, or -1 on error
 static int bg_cpuset_fd = -1;
 static int fg_cpuset_fd = -1;
+static int bg_schedboost_fd = -1;
+static int fg_schedboost_fd = -1;
 #endif
 
 /* Add tid to the scheduling group defined by the policy */
@@ -128,6 +130,12 @@
         fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC);
         filename = "/dev/cpuset/background/tasks";
         bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC);
+#ifdef USE_SCHEDBOOST
+        filename = "/sys/fs/cgroup/stune/foreground/tasks";
+        fg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC);
+        filename = "/sys/fs/cgroup/stune/tasks";
+        bg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC);
+#endif
     }
 #endif
 
@@ -253,17 +261,20 @@
     pthread_once(&the_once, __initialize);
 
     int fd;
+    int boost_fd;
     switch (policy) {
     case SP_BACKGROUND:
         fd = bg_cpuset_fd;
+        boost_fd = bg_schedboost_fd;
         break;
     case SP_FOREGROUND:
     case SP_AUDIO_APP:
     case SP_AUDIO_SYS:
         fd = fg_cpuset_fd;
+        boost_fd = fg_schedboost_fd;
         break;
     default:
-        fd = -1;
+        boost_fd = fd = -1;
         break;
     }
 
@@ -272,6 +283,11 @@
             return -errno;
     }
 
+    if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) {
+        if (errno != ESRCH && errno != ENOENT)
+            return -errno;
+    }
+
     return 0;
 #endif
 }