linux-kernel - [PATCH v2] selftests: ftrace: Allow some tests to be run in a tracing instance

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Date:   Fri, 21 Apr 2017 10:41:44 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Shuah Khan <shuah@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH v2] selftests: ftrace: Allow some tests to be run in a
 tracing instance


An tracing instance has several of the same capabilities as the top level
instance, but may be implemented slightly different. Instead of just writing
tests that duplicat the same test cases of the top level instance, allow a
test to be written for both the top level as well as for an instance.

If a test case can be run in both the top level as well as in an tracing
instance directory, then it should add a tag "# flags: instance" in the
header of the test file. Then after all tests have run, any test that has an
instance flag set, will run again within a tracing instance.

Cc: Shuah Khan <shuah@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---

Changes since v1: (comments from Masami Hiramatsu)

 Use test flag instead of file name change.
 Remove -i option to run_test function
 Use global variable to denote instance running
 Update TRACING_DIR instead of cd'ing to another directory.

 tools/testing/selftests/ftrace/ftracetest | 40 +++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index a8631d9..9992ff6 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -157,6 +157,15 @@ testcase() { # testfile
   prlog -n "[$CASENO]$desc"
 }
 
+INSTANCE=0
+testinstance() { # testfile
+    if grep -q '^#[ \t]*flags:.*instance' $1 ; then
+	INSTANCE=1
+    else
+	INSTANCE=0
+    fi
+}
+
 eval_result() { # sigval
   case $1 in
     $PASS)
@@ -233,18 +242,26 @@ exit_xfail () {
 }
 trap 'SIG_RESULT=$XFAIL' $SIG_XFAIL
 
+INSTANCE_DIR="."
 __run_test() { # testfile
   # setup PID and PPID, $$ is not updated.
   (cd $TRACING_DIR; read PID _ < /proc/self/stat; set -e; set -x; initialize_ftrace; . $1)
   [ $? -ne 0 ] && kill -s $SIG_FAIL $SIG_PID
 }
 
+TEST_INSTANCES=0
+
 # Run one test case
 run_test() { # testfile
   local testname=`basename $1`
   local testlog=`mktemp $LOG_DIR/${testname}-log.XXXXXX`
   export TMPDIR=`mktemp -d /tmp/ftracetest-dir.XXXXXX`
   testcase $1
+  local SAVE_TRACING_DIR=$TRACING_DIR
+  if [ $TEST_INSTANCES -eq 1 ]; then
+    TRACING_DIR=$TRACING_DIR/instances/${testname}_test_$$
+    mkdir $TRACING_DIR
+  fi
   echo "execute: "$1 > $testlog
   SIG_RESULT=0
   if [ $VERBOSE -ge 2 ]; then
@@ -260,17 +277,40 @@ run_test() { # testfile
     [ $VERBOSE -ge 1 ] && catlog $testlog
     TOTAL_RESULT=1
   fi
+  if [ $TEST_INSTANCES -eq 1 ]; then
+    rmdir $TRACING_DIR
+  fi
+  TRACING_DIR=$SAVE_TRACING_DIR
   rm -rf $TMPDIR
 }
 
 # load in the helper functions
 . $TEST_DIR/functions
 
+RUN_INSTANCES=0
+
 # Main loop
 for t in $TEST_CASES; do
+  testinstance $t
+  if [ $INSTANCE -eq 1 ]; then
+    RUN_INSTANCES=1
+  fi
   run_test $t
 done
 
+TEST_INSTANCES=1
+
+if [ $RUN_INSTANCES -eq 1 ]; then
+    echo "Running tests in a tracing instance:"
+    for t in $TEST_CASES; do
+	testinstance $t
+	if [ $INSTANCE -eq 0 ]; then
+	    continue
+	fi
+	run_test $t
+    done
+fi
+
 prlog ""
 prlog "# of passed: " `echo $PASSED_CASES | wc -w`
 prlog "# of failed: " `echo $FAILED_CASES | wc -w`
-- 
2.9.3