Commit d378677d authored by Ramon Nou's avatar Ramon Nou
Browse files

enhance syscall measurement by adding 'getpagesize' support and updating CI scripts

parent 203a3d4b

.gitlab-ci.yml

+6 −0
Original line number Diff line number Diff line
@@ -56,11 +56,17 @@ unit-test-job: # This job runs in the test stage. 
  image: gekkofs/deps:0.9.4-dev

  needs: ['build-job']

  script:

    - ${BUILD_PATH}/opendevnull --syscall open --reps 1 --verbose

    - LD_PRELOAD=${BUILD_PATH}/libeval_intercept.so ${BUILD_PATH}/opendevnull --syscall open --reps 1 --verbose

    - ${BUILD_PATH}/opendevnull --syscall getpid --reps 1 --verbose

    - LD_PRELOAD=${BUILD_PATH}/libeval_intercept.so ${BUILD_PATH}/opendevnull --syscall getpid --reps 1 --verbose

    - LD_PRELOAD=${BUILD_PATH}/libeval_intercept.so ${BUILD_PATH}/opendevnull --syscall getpid --reps 1 --verbose --always_syscall

    - ${BUILD_PATH}/opendevnull --syscall kill --reps 1 --verbose

    - LD_PRELOAD=${BUILD_PATH}/libeval_intercept.so ${BUILD_PATH}/opendevnull --syscall kill --reps 1 --verbose

    - LD_PRELOAD=${BUILD_PATH}/libeval_intercept.so ${BUILD_PATH}/opendevnull --syscall kill --reps 1 --verbose --always_syscall

    - ${BUILD_PATH}/opendevnull --syscall getpagesize --reps 1 --verbose

    - LD_PRELOAD=${BUILD_PATH}/libeval_intercept.so ${BUILD_PATH}/opendevnull --syscall getpagesize --reps 1 --verbose

    - LD_PRELOAD=${BUILD_PATH}/libeval_intercept.so ${BUILD_PATH}/opendevnull --syscall getpagesize --reps 1 --verbose --always_syscall

  artifacts:

    expire_in: 1 week

    when: always

CMakeLists.txt

+10 −11
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMake" ${CMAKE_MODULE_PATH}) 


message(STATUS "[${PROJECT_NAME}] Checking for syscall_intercept")

find_package(Syscall_intercept REQUIRED)

# Print the include directory for debugging

message(STATUS "Syscall_intercept include dir: ${Syscall_intercept_INCLUDE_DIR}")





set(INCLUDE_DIR "${CMAKE_SOURCE_DIR}/include")
@@ -33,23 +35,20 @@ include_directories( 
    ${INCLUDE_DIR}

    ${CMAKE_BINARY_DIR}/include

    /usr/include

    ${Syscall_intercept_INCLUDE_DIR}

)



add_library(eval_intercept SHARED src/eval.cpp)

add_executable(opendevnull src/opendevnull.cpp)



add_library(eval_intercept SHARED)

add_executable(opendevnull)

target_sources(eval_intercept

    PRIVATE

        src/eval.cpp

)



target_sources(opendevnull

# Include path from Syscall_intercept into opendevnull

target_include_directories(opendevnull

    PRIVATE

        src/opendevnull.cpp

        ${Syscall_intercept_INCLUDE_DIR}

)



# Include path from Syscall_intercept into opendevnull

target_include_directories(opendevnull

target_include_directories(eval_intercept

    PRIVATE

        ${Syscall_intercept_INCLUDE_DIR}

)
@@ -75,6 +74,6 @@ install( 


install(

    TARGETS opendevnull

    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}

    RUNTIME DESTINATION ${CMAKE_INSTALL_LIBDIR}

    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}

)

scripts/run.sh

+73 −6
Original line number Diff line number Diff line 
NATIVE="./opendevnull --syscall getpid"

INTERC="./opendevnull --syscall getpid"

SC2SC="./opendevnull --syscall getpid --always_syscall"



#!/bin/bash 

SYSCALL="getpid"

BUILD=../build



REPEATS=20

ARCH="X86"



NATIVE="$BUILD/opendevnull --syscall $SYSCALL"

INTERC="$BUILD/opendevnull --syscall $SYSCALL"

SC2SC="$BUILD/opendevnull --syscall $SYSCALL --always_syscall"





# Arrays to store output values

native_outputs=()

interc_outputs=()

sc2sc_outputs=()



# Function to calculate statistics

calculate_stats() {

    local values=("$@")

    local sum=0

    local count=${#values[@]}

    local min=${values[0]}

    local max=${values[0]}



    # Calculate sum, min, and max

    for value in "${values[@]}"; do

        sum=$(echo "$sum + $value" | bc)

        if (( $(echo "$value < $min" | bc -l) )); then

            min=$value

        fi

        if (( $(echo "$value > $max" | bc -l) )); then

            max=$value

        fi

    done



    # Calculate average

    local avg=$(echo "scale=2; $sum / $count" | bc)



    # Calculate standard deviation

    local variance=0

    for value in "${values[@]}"; do

        variance=$(echo "$variance + ($value - $avg)^2" | bc)

    done

    local stddev=$(echo "scale=2; sqrt($variance / $count)" | bc)



    echo "Average: $avg, Min: $min, Max: $max, StdDev: $stddev"

}



for ((i=1; i<=REPEATS; i++))

do

	OUTPUT=$($NATIVE | cut -f4 --delim=" ")

        native_outputs+=("$OUTPUT")

	echo "Native,$ARCH,"$OUTPUT 

done



for ((i=1; i<=REPEATS; i++))

do

        OUTPUT=$(LD_PRELOAD=./libeval_intercept.so  $INTERC | cut -f4 --delim=" ")

        OUTPUT=$(LD_PRELOAD=$BUILD/libeval_intercept.so $INTERC | cut -f4 --delim=" ")

        interc_outputs+=("$OUTPUT")

        echo "Syscall,$ARCH,"$OUTPUT

done





for ((i=1; i<=REPEATS; i++))

do

        OUTPUT=$(LD_PRELOAD=./libeval_intercept.so  $SC2SC | cut -f4 --delim=" ")

        OUTPUT=$(LD_PRELOAD=$BUILD/libeval_intercept.so $SC2SC | cut -f4 --delim=" ")

        sc2sc_outputs+=("$OUTPUT")

        echo "Syscall2S,$ARCH,"$OUTPUT

done



# Calculate and print statistics

echo ""

echo "Statistics for NATIVE mode:"

calculate_stats "${native_outputs[@]}"



echo ""

echo "Statistics for INTERC mode:"

calculate_stats "${interc_outputs[@]}"



echo ""

echo "Statistics for SC2SC mode:"

calculate_stats "${sc2sc_outputs[@]}"



# Calculate overhead

native_avg=$(echo "${native_outputs[@]}" | tr ' ' '\n' | awk '{sum+=$1} END {print sum/NR}')

interc_avg=$(echo "${interc_outputs[@]}" | tr ' ' '\n' | awk '{sum+=$1} END {print sum/NR}')

sc2sc_avg=$(echo "${sc2sc_outputs[@]}" | tr ' ' '\n' | awk '{sum+=$1} END {print sum/NR}')



overhead_interc=$(echo "scale=2; (($interc_avg - $native_avg) / $native_avg) * 100" | bc)

overhead_sc2sc=$(echo "scale=2; (($sc2sc_avg - $native_avg) / $native_avg) * 100" | bc)



echo ""

echo "Overhead of INTERC over NATIVE: $overhead_interc%"

echo "Overhead of SC2SC over NATIVE: $overhead_sc2sc%"

src/opendevnull.cpp

+21 −3
Original line number Diff line number Diff line
@@ -58,7 +58,7 @@ main(int argc, char* argv[]) { 
                syscall = argv[++i];

            } else {

                std::cerr

                        << "Error: --syscall requires an argument (open|getpid|kill)"

                        << "Error: --syscall requires an argument (open|getpid|kill|getpagesize)"

                        << std::endl;

                return 1;

            }
@@ -133,7 +133,22 @@ main(int argc, char* argv[]) { 
    auto post_kill = [](int) {

    };



    double time_taken = 0.0;



    // getpagesyze() is used to determine the page size, pre - post

    auto pre_size = []() {

      int ret = getpagesize();

      if(verbose) {

          std::cout << "getpagesize() returned " << ret << std::endl;

      }

      if(always_syscall) {

          syscall_no_intercept(SYS_getpagesize);

      }

      return ret;

  };



  auto post_size = [](int) {

  };

   



    if(syscall == "open") {

        time_taken = measure_syscall_time(pre_open, post_open, reps);
@@ -141,7 +156,10 @@ main(int argc, char* argv[]) { 
        time_taken = measure_syscall_time(pre_getpid, post_getpid, reps);

    } else if(syscall == "kill") {

        time_taken = measure_syscall_time(pre_kill, post_kill, reps);

    } else {

    }  else if(syscall == "getpagesize") {

      time_taken = measure_syscall_time(pre_size, post_size, reps);

  }

  else {

        std::cerr << "Error: Unsupported syscall '" << syscall << "'"

                  << std::endl;

        return 1;