P4 to Git Change 1201490 by xcui@merged_opencl_jxcwin on 2015/10/20 10:47:18

SWDEV-41018 -  if system is equal to or less than 2GB memory, disable CPU and APU for OpenCL, and force the device to be 1.2 if it is a discrete GPU.

	precheckin:
	http://ocltc.amd.com:8111/viewModification.html?modId=60516&personal=true&buildTypeId=&tab=vcsModificationBuilds&show_all_builds=true
	code review:
	http://ocltc.amd.com/reviews/r/8738/

Affected files ...

... //depot/stg/opencl/drivers/opencl/runtime/device/cpu/cpudevice.cpp#277 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpudevice.cpp#531 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpusettings.cpp#331 edit
... //depot/stg/opencl/drivers/opencl/runtime/device/gpu/gpusettings.hpp#95 edit

rocclr/runtime/device/cpu/cpudevice.cpp

@@ -235,6 +235,10 @@ Device::init()
     virtualMemSize =
         (uintptr_t) std::min(statex.ullTotalPageFile, statex.ullTotalVirtual);
 #endif
+    //disable CPU device if system memory is equal to or less than 2GB
+    if (info.globalMemSize_ <= 2 * Gi) {
+        return true;
+    }
 
     maxWorkerThreads_ = (size_t) (virtualMemSize /
         (uintptr_t) ((CPU_WORKER_THREAD_STACK_SIZE +