commit 88ef9f062950e6f38efae82fd2527cda2c8883f4
author Joel Fernandes <joelaf@google.com> Sat Mar 25 22:46:10 2017 -0700
committer Joel Fernandes <joelaf@google.com> Sat May 13 19:41:05 2017 +0000
tree 1745bd665620ddb747d73e3912704bef04a4deb4
parent f50d1091e9e92c4b72cb3122305cbc96cb07238c

libcutils: Add support for RT schedtune group

Add an SP_RT_APP group which will be used to provide minimum
capacity guarantees to RT tasks sensitive to frequency drops
such as synthesizer workloads.

Bug: 33085313
Change-Id: I07cca79e52661d1325a1db9ef3b61eb0f8d20989
Signed-off-by: Joel Fernandes <joelaf@google.com>

libcutils/sched_policy.cpp

diff --git a/libcutils/sched_policy.cpp b/libcutils/sched_policy.cpp
index e29a844..7170b48 100644
--- a/libcutils/sched_policy.cpp
+++ b/libcutils/sched_policy.cpp
@@ -70,6 +70,7 @@
 static int bg_schedboost_fd = -1;
 static int fg_schedboost_fd = -1;
 static int ta_schedboost_fd = -1;
+static int rt_schedboost_fd = -1;
 
 /* Add tid to the scheduling group defined by the policy */
 static int add_tid_to_cgroup(int tid, int fd)
@@ -173,6 +174,8 @@
                 fg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC);
                 filename = "/dev/stune/background/tasks";
                 bg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC);
+                filename = "/dev/stune/rt/tasks";
+                rt_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC);
             }
         }
     }
@@ -408,6 +411,9 @@
     case SP_SYSTEM:
         SLOGD("/// tid %d (%s)", tid, thread_name);
         break;
+    case SP_RT_APP:
+	SLOGD("RT  tid %d (%s)", tid, thread_name);
+	break;
     default:
         SLOGD("??? tid %d (%s)", tid, thread_name);
         break;
@@ -428,6 +434,9 @@
         case SP_TOP_APP:
             boost_fd = ta_schedboost_fd;
             break;
+        case SP_RT_APP:
+	    boost_fd = rt_schedboost_fd;
+	    break;
         default:
             boost_fd = -1;
             break;
@@ -472,6 +481,7 @@
        [SP_AUDIO_APP]  = "aa",
        [SP_AUDIO_SYS]  = "as",
        [SP_TOP_APP]    = "ta",
+       [SP_RT_APP]    = "rt",
     };
     if ((policy < SP_CNT) && (strings[policy] != NULL))
         return strings[policy];