Commit 4321ad4e authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
Browse files

perf test: Use a test program in 'perf record' tests 



If the system has cc it could build a test program with two threads
and then use it for more detailed testing.  Also it accepts an option
to run a thread forever to ensure multi-thread runs.

If cc is not found, it falls back to use the default value 'true'.

Reviewed-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Acked-by: default avatarIan Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221020172643.3458767-4-namhyung@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 9e455f4f

tools/perf/tests/shell/record.sh

+60 −4
Original line number Diff line number Diff line
@@ -6,10 +6,17 @@ set -e 


err=0

perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)

testprog=$(mktemp /tmp/__perf_test.prog.XXXXXX)

testsym="test_loop"



cleanup() {

  rm -f "${perfdata}"

  rm -f "${perfdata}".old



  if [ "${testprog}" != "true" ]; then

    rm -f "${testprog}"

  fi



  trap - EXIT TERM INT

}
@@ -19,9 +26,56 @@ trap_cleanup() { 
}

trap trap_cleanup EXIT TERM INT



build_test_program() {

  if ! [ -x "$(command -v cc)" ]; then

    # No CC found. Fall back to 'true'

    testprog=true

    testsym=true

    return

  fi



  echo "Build a test program"

  cat <<EOF | cc -o ${testprog} -xc - -pthread

#include <stdio.h>

#include <stdlib.h>

#include <pthread.h>



void test_loop(void) {

  volatile int count = 1000000;



  while (count--)

    continue;

}



void *thfunc(void *arg) {

  int forever = *(int *)arg;



  do {

    test_loop();

  } while (forever);



  return NULL;

}



int main(int argc, char *argv[]) {

  pthread_t th;

  int forever = 0;



  if (argc > 1)

    forever = atoi(argv[1]);



  pthread_create(&th, NULL, thfunc, &forever);

  test_loop();

  pthread_join(th, NULL);



  return 0;

}

EOF

}



test_per_thread() {

  echo "Basic --per-thread mode test"

  if ! perf record -o /dev/null --quiet true 2> /dev/null

  if ! perf record -o /dev/null --quiet ${testprog} 2> /dev/null

  then

    echo "Per-thread record [Skipped event not supported]"

    if [ $err -ne 1 ]
@@ -30,13 +84,13 @@ test_per_thread() { 
    fi

    return

  fi

  if ! perf record --per-thread -o "${perfdata}" true 2> /dev/null

  if ! perf record --per-thread -o "${perfdata}" ${testprog} 2> /dev/null

  then

    echo "Per-thread record [Failed record]"

    err=1

    return

  fi

  if ! perf report -i "${perfdata}" -q | grep -q true

  if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"

  then

    echo "Per-thread record [Failed missing output]"

    err=1
@@ -62,7 +116,7 @@ test_register_capture() { 
    return

  fi

  if ! perf record -o - --intr-regs=di,r8,dx,cx -e br_inst_retired.near_call:p \

    -c 1000 --per-thread true 2> /dev/null \

    -c 1000 --per-thread ${testprog} 2> /dev/null \

    | perf script -F ip,sym,iregs -i - 2> /dev/null \

    | grep -q "DI:"

  then
@@ -73,6 +127,8 @@ test_register_capture() { 
  echo "Register capture test [Success]"

}



build_test_program



test_per_thread

test_register_capture