1 files changed, 16 insertions, 10 deletions
diff --git a/tensorflow/compiler/xla/service/hlo.proto b/tensorflow/compiler/xla/service/hlo.proto
index 99d0cf50ca..93ec2c9438 100644
--- a/tensorflow/compiler/xla/service/hlo.proto
+++ b/tensorflow/compiler/xla/service/hlo.proto
@@ -199,6 +199,17 @@ message HloComputationProto {
   int64 root_id = 6;
 }
 
+// Serialization of an HLO schedule. An HLO schedule contains a total order of
+// instructions for each non-fusion computation in the module.
+message HloScheduleProto {
+  message InstructionSequence {
+    repeated int64 instruction_ids = 1;
+  }
+
+  // Map from computation id to sequence.
+  map<int64, InstructionSequence> sequences = 1;
+}
+
 // Serialization of HloModule.
 message HloModuleProto {
   string name = 1;
@@ -214,16 +225,9 @@ message HloModuleProto {
 
   // The id of this module.
   int64 id = 5;
-}
 
-// Serialization of HloOrdering.
-message HloOrderingProto {
-  // NOTE: currently only sequential orderings are serialized.
-  message SequentialComputation {
-    string computation_name = 1;
-    repeated string instruction_names = 2;
-  }
-  repeated SequentialComputation sequential_computations = 1;
+  // The schedule for this module.
+  HloScheduleProto schedule = 7;
 }
 
 // Serialization of LogicalBuffer.
@@ -322,8 +326,10 @@ message BufferAssignmentProto {
 
 // Grouping message that contains all of the information above.
 message HloProto {
+  reserved 2;
+  reserved "hlo_ordering";
+
   HloModuleProto hlo_module = 1;
-  HloOrderingProto hlo_ordering = 2;
   BufferAssignmentProto buffer_assignment = 3;
 }