Add perf stat support

configs/5.15.79-peter.sh

@@ -2,4 +2,5 @@ IS_CUSTOM_KERNEL=true
 KERNEL_SRC=/home/p5cai/workspace/linux
 CPUPOWER=$KERNEL_SRC/tools/power/cpupower/cpupower
 X86_ENERGY_PERF_POLICY=$KERNEL_SRC/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy
+PERF=$KERNEL_SRC/tools/perf/perf
 export LD_LIBRARY_PATH="$LD_LIBRARY_PATH":"$KERNEL_SRC/tools/power/cpupower"

configs/base.sh

 IS_CUSTOM_KERNEL=false
 CPUPOWER=cpupower
 X86_ENERGY_PERF_POLICY=x86_energy_perf_policy
+PERF=perf
 
 # Execute all SSH commands under this user
 # so that we don't need ssh keys for root

experiments/memcached.shared.sh

+source "$EXP_ROOT/experiments/perf.shared.sh"
+
 CONNS=160 # per agent thread
 
 load_config() {
@@ -37,7 +39,9 @@ warmup() {
 
 run_mutilate() {
     echo "Running mutilate with $CONNS connections per agent (core) and QPS = $QPS"
+    perf_stat_start "$1"
     sudo -u $SSH_USER $MUTILATE --noload -c$CONNS $MUTCLIENTS -t30 -u 0 -q $QPS | tee $DATA_OUT/$1.txt
+    perf_stat_stop
 }
 
 memcached_pre_start() {

experiments/perf.shared.sh

+perf_stat_start() {
+    $PERF stat -C 0-$((THREADS - 1)) -e LLC-load-misses:u,LLC-load-misses:k,mem_load_uops_retired.llc_miss,mem_uops_retired.all_loads,cycles,cycles:u,cycles:k,instructions,instructions:u,instructions:k,stalled-cycles-frontend,stalled-cycles-backend -o "$DATA_OUT/stat_$1.txt" &
+    PERF_STAT_PID=$!
+}
+
+perf_stat_stop() {
+    kill -INT "$PERF_STAT_PID" || true
+}