From 093be89a12c8724883ac803420cba8b08a947d3b Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Mon, 17 Apr 2017 11:44:30 +0900 Subject: selftests: ftrace: Add a testcase for function PID filter Like event pid filtering test, add function pid filtering test with the new "function-fork" option. It also tests it on an instance directory so that it can verify the bug related pid filtering on instances. Link: http://lkml.kernel.org/r/20170417024430.21194-5-namhyung@kernel.org Cc: Ingo Molnar Cc: Masami Hiramatsu Cc: Shuah Khan Signed-off-by: Namhyung Kim Signed-off-by: Steven Rostedt (VMware) --- .../ftrace/test.d/ftrace/func-filter-pid.tc | 98 ++++++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc (limited to 'tools/testing') diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc new file mode 100644 index 000000000000..cd552f44c3b4 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc @@ -0,0 +1,98 @@ +#!/bin/sh +# description: ftrace - function pid filters + +# Make sure that function pid matching filter works. +# Also test it on an instance directory + +if ! grep -q function available_tracers; then + echo "no function tracer configured" + exit_unsupported +fi + +if [ ! -f set_ftrace_pid ]; then + echo "set_ftrace_pid not found? Is function tracer not set?" + exit_unsupported +fi + +if [ ! -f set_ftrace_filter ]; then + echo "set_ftrace_filter not found? Is function tracer not set?" + exit_unsupported +fi + +read PID _ < /proc/self/stat + +# default value of function-fork option +orig_value=`grep function-fork trace_options` + +do_reset() { + reset_tracer + clear_trace + enable_tracing + echo > set_ftrace_filter + echo > set_ftrace_pid + + echo $orig_value > trace_options +} + +fail() { # msg + do_reset + echo $1 + exit $FAIL +} + +yield() { + ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1 +} + +do_test() { + disable_tracing + + echo do_execve* > set_ftrace_filter + echo *do_fork >> set_ftrace_filter + + echo $PID > set_ftrace_pid + echo function > current_tracer + + # don't allow children to be traced + echo nofunction-fork > trace_options + + enable_tracing + yield + + count_pid=`cat trace | grep -v ^# | grep $PID | wc -l` + count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l` + + # count_other should be 0 + if [ $count_pid -eq 0 -o $count_other -ne 0 ]; then + fail "PID filtering not working?" + fi + + disable_tracing + clear_trace + + # allow children to be traced + echo function-fork > trace_options + + enable_tracing + yield + + count_pid=`cat trace | grep -v ^# | grep $PID | wc -l` + count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l` + + # count_other should NOT be 0 + if [ $count_pid -eq 0 -o $count_other -eq 0 ]; then + fail "PID filtering not following fork?" + fi +} + +do_test + +mkdir instances/foo +cd instances/foo +do_test +cd ../../ +rmdir instances/foo + +do_reset + +exit 0 -- cgit v1.2.3-59-g8ed1b From 9ed19c7695670d00455c1de4682d5c7f14618689 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (VMware)" Date: Tue, 18 Apr 2017 12:32:21 -0400 Subject: selftests: ftrace: Add check for function-fork before running pid filter test Have the func-filter-pid test check for the function-fork option before testing it. It can still test the pid filtering, but will stop before testing the function-fork option for children inheriting the pids. This allows the test to be added before the function-fork feature, but after a bug fix that triggers one of the bugs the test can cause. Cc: Namhyung Kim Cc: Shuah Khan Signed-off-by: Steven Rostedt (VMware) --- .../ftrace/test.d/ftrace/func-filter-pid.tc | 27 ++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) (limited to 'tools/testing') diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc index cd552f44c3b4..bab5ff7c607e 100644 --- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc @@ -19,10 +19,19 @@ if [ ! -f set_ftrace_filter ]; then exit_unsupported fi +do_function_fork=1 + +if [ ! -f options/function-fork ]; then + do_function_fork=0 + echo "no option for function-fork found. Option will not be tested." +fi + read PID _ < /proc/self/stat -# default value of function-fork option -orig_value=`grep function-fork trace_options` +if [ $do_function_fork -eq 1 ]; then + # default value of function-fork option + orig_value=`grep function-fork trace_options` +fi do_reset() { reset_tracer @@ -31,6 +40,10 @@ do_reset() { echo > set_ftrace_filter echo > set_ftrace_pid + if [ $do_function_fork -eq 0 ]; then + return + fi + echo $orig_value > trace_options } @@ -53,8 +66,10 @@ do_test() { echo $PID > set_ftrace_pid echo function > current_tracer - # don't allow children to be traced - echo nofunction-fork > trace_options + if [ $do_function_fork -eq 1 ]; then + # don't allow children to be traced + echo nofunction-fork > trace_options + fi enable_tracing yield @@ -70,6 +85,10 @@ do_test() { disable_tracing clear_trace + if [ $do_function_fork -eq 0 ]; then + return + fi + # allow children to be traced echo function-fork > trace_options -- cgit v1.2.3-59-g8ed1b