added lowlatency (SCHED_DEADLINE) option in toplevel build script

cmake_targets/CMakeLists.txt

@@ -421,7 +421,7 @@ elseif (${RF_BOARD} STREQUAL "OAI_USRP")
     ${OPENAIR_TARGETS}/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp)
   LINK_DIRECTORIES("/opt/lib")
   set(option_HW_lib "uhd")
-  set(LOWLATENCY False)
+  #set(LOWLATENCY False)
 
 elseif (${RF_BOARD} STREQUAL "OAI_BLADERF")
   include_directories("${OPENAIR_TARGETS}/ARCH/BLADERF/USERSPACE/LIB/")
@@ -432,14 +432,14 @@ elseif (${RF_BOARD} STREQUAL "OAI_BLADERF")
     )
   LINK_DIRECTORIES("/usr/lib/x86_64-linux-gnu")
   set(option_HW_lib "bladeRF")
-#set(LOWLATENCY False)
+ #set(LOWLATENCY False)
 
 elseif (${RF_BOARD} STREQUAL "ETHERNET")
   include_directories ("${OPENAIR_TARGETS}/ARCH/ETHERNET/USERSPACE/LIB")
   set(HW_SOURCE ${HW_SOURCE}
     ${OPENAIR_TARGETS}/ARCH/ETHERNET/USERSPACE/LIB/ethernet_lib.c
     )
-  set(LOWLATENCY True)
+  #set(LOWLATENCY True)
   
 elseif (${RF_BOARD} STREQUAL "CPRIGW")
   set(HW_SOURCE ${HW_SOURCE}
@@ -451,6 +451,7 @@ endif (${RF_BOARD} STREQUAL "EXMIMO")
 
 include_directories ("${OPENAIR_TARGETS}/ARCH/COMMON")
 
+Message("LOWLATENCY flag  is ${LOWLATENCY}")
 
 ##############################################################
 #    ???!!! TO BE DOCUMENTED OPTIONS !!!???

cmake_targets/build_oai

@@ -45,6 +45,7 @@ MSC_GEN="False"
 XFORMS="False"
 PRINT_STATS="False"
 VCD_TIMING="False"
+LOWLATENCY_FLAG_USER="True"
 REL="Rel10"
 HW="EXMIMO"
 NOS1=0
@@ -113,6 +114,8 @@ Options
    Shows detailed compilation instructions in makefile
 --cflags_processor
    Manually Add CFLAGS of processor if they are not detected correctly by script. Only add these flags if you know your processor supports them. Example flags: -msse3 -msse4.1 -msse4.2 -mavx2
+--disable-deadline
+   Disables deadline scheduler of Linux kernel (>=3.14.x). The deadline scheduler is enabled by default
 
 Usage (first build):
  oaisim (eNB + UE): ./build_oai -I -g --oaisim -x --install-system-files
@@ -225,6 +228,10 @@ function main() {
             CFLAGS_PROCESSOR_USER=$2
             echo_info "setting CPU FLAGS from USER to: $CFLAGS_PROCESSOR_USER"
             shift 2;;
+       --disable-deadline)
+            LOWLATENCY_FLAG_USER="False"
+            echo_info "Disabling the usage of deadline scheduler"
+            shift 1;;
         -h | --help)
             print_help
             exit 1;;
@@ -321,6 +328,7 @@ function main() {
     echo "set ( ENABLE_VCD_FIFO $VCD_TIMING )"     >>  $cmake_file
     echo "set ( RF_BOARD \"${HW}\")"               >>  $cmake_file
     echo "set(PACKAGE_NAME \"${lte_exec}\")"     >>  $cmake_file
+    echo "set (LOWLATENCY \"${LOWLATENCY_FLAG_USER}\" )"    >>$cmake_file
     echo 'include(${CMAKE_CURRENT_SOURCE_DIR}/../CMakeLists.txt)' >> $cmake_file
     cd  $DIR/$lte_build_dir/build
     cmake ..
@@ -539,6 +547,7 @@ function main() {
     echo "set(ENABLE_ITTI False )"     					 >>  $cmake_file
     echo "set(RF_BOARD \"${HW}\")"               >>  $cmake_file
     echo 'set(PACKAGE_NAME "\"rrh_gw\"")' >>  $cmake_file
+    echo "set(LOWLATENCY \"${LOWLATENCY_FLAG_USER}\")"    >>$cmake_file
     echo 'include(${CMAKE_CURRENT_SOURCE_DIR}/../CMakeLists.txt)' >> $cmake_file
 
     [ "$CLEAN" = "1" ] && rm -rf $DIR/rrh_gw/build