[BEAM-3005] Add resource limits to provision proto

model/fn-execution/src/main/proto/beam_provision_api.proto

@@ -58,4 +58,42 @@ message ProvisionInfo {
     // (required) Pipeline options. For non-template jobs, the options are
     // identical to what is passed to job submission.
     google.protobuf.Struct pipeline_options = 3;
+
+    // (optional) Resource limits that the SDK harness worker should respect.
+    // Runners may -- but are not required to -- enforce any limits provided.
+    Resources resource_limits = 4;
+}
+
+// Resources specify limits for local resources, such memory and cpu. It
+// is used to inform SDK harnesses of their allocated footprint.
+message Resources {
+    // Memory limits.
+    message Memory {
+        // (optional) Hard limit in bytes. A zero value means unspecified.
+        uint64 size = 1;
+
+        // TOOD(herohde) 10/20/2017: consider soft limits, shm usage?
+    }
+    // (optional) Memory usage limits. SDKs can use this value to configure
+    // internal buffer sizes and language specific sizes.
+    Memory memory = 1;
+
+    // CPU limits.
+    message Cpu {
+        // (optional) Shares of a cpu to use. Fractional values, such as "0.2"
+        // or "2.5", are fine. Any value <= 0 means unspecified.
+        float shares = 1;
+
+        // TODO(herohde) 10/20/2017: consider cpuset?
+    }
+    // (optional) CPU usage limits.
+    Cpu cpu = 2;
+
+    // Disk limits.
+    message Disk {
+        // (optional) Hard limit in bytes. A zero value means unspecified.
+        uint64 size = 1;
+    }
+    // (optional) Disk size limits for the semi-persistent location.
+    Disk semi_persistent_disk = 3;
 }