Date:   Fri, 17 Aug 2018 01:29:11 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Shuah Khan <shuah@...nel.org>, Steven Rostedt <rostedt@...dmis.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 00/32] selftests/ftrace: Improve ftracetest with coverage check

Hello,

Here is the 2nd version of the series for improving ftracetest
testcase using gcov/lcov. From previous version, I've added 6
new testcases for some tracers and ftrace basic features.

With this series, ftracetest coverage under kernel/trace/
is improved as below. (Note that this kernel enables
ftrace startup tests)

Without new testcases
Lines:		10563	17268	61.2 %
Functions:	1114	1785	62.4 %

With new testcases
Lines:		11703	17268	67.8 %
Functions:	1262	1785	70.7 %

Of course we don't need to make it 100%, because ftracetest
is a function/specification test, and there are functions and
lines which never be called (like critical error detection :) ).
Also, ftrace has some amount of code for perf and bpf subsystem
which should be tested by perf/bpf tests.
However, GCOV(LCOV) gives us a good insight into which
functions are covered or not covered by the test cases.
We can find which functions are not tested yet from the
coverage information.

This series has some ftracetest framework improvements too,
which are for debugging ftracetest itself.

Tracing/Gcov-kernel:
 - Add CONFIG_GCOV_PROFILE_FRACE, which enables gcov profiling
   only on tracing subsystem (under kernel/trace/). This may not
   needed for everyone (like a debugging feature).
   So it can be dropped anyway.

Ftracetest framework improvements:
 - Add --stop-fail for detecting failure soon.
 - Add --console for interactively debugging a testcase by shell.
 - Add testcase-number prefix to logfile for finding log easier.
 - Improve general init function
 - Call general init function after all testcases.
 - Remove init/cleanup code from all testcase (since general init
   function will fixed it up)

Testcase fixes:
 - Fix to check $comm availability.
 - Make checkbashisms clean

Testcase improvements:
 - Use loopback address instead of localhost
 - Improve kprobe on module testcase to load/unload module
 - Improve kprobe testcase to check log data
 - Improve kretprobe testcase to check log data
 - Test kprobe-event argument with various bitsize
 - Check set_event_pid result

Adding testcases:
 - Add kprobe event with $comm argument testcase
 - Add kprobe profile testcase
 - Add kprobe-event with symbol argument testcase
 - Add nop tracer testcase
 - Add trace_printk sample module testcase
 - Add ringbuffer size changing testcase
 - Add function profiling statistics testcase
 - Add max stack tracer testcase
 - Add function filter on module testcase
 - Add trace_pipe testcase
 - Add stacktrace ftrace filter command testcase
 - Add wakeup tracer testcase
 - Add wakeup_rt tracer testcase
 - Add blktrace testcase
 - Add ftrace cpumask testcase
 - Add ftrace output format testcase 

TBD:
Following testcase improvements are remaining.
 - Checking of various supported types (like u8, u64 etc.)
   testcases

Thank you,

---

Masami Hiramatsu (32):
      tracing: Allow gcov profiling on only ftrace subsystem
      selftests/ftrace: Add --stop-fail hidden option for debug
      selftests/ftrace: Add --console hidden option
      selftests/ftrace: Add case number prefix to logfile
      selftests/ftrace: More initialize features in initialize_ftrace
      selftests/ftrace: Add SPDX License Identifier to template
      selftests/ftrace: Cleanup ftrace after running test
      selftests/ftrace: Remove unneeded per-test init/cleanup ftrace
      selftests/ftrace: Fix to test kprobe $comm arg only if available
      selftests/ftrace: Fix checkbashisms errors
      selftests/ftrace: Use loopback address instead of localhost
      selftests/ftrace: Improve kprobe on module testcase to load/unload module
      selftests/ftrace: Improve kprobe testcase to check log data
      selftests/ftrace: Improve kretprobe testcase to check log data
      selftests/ftrace: Test kprobe-event argument with various bitsize
      selftests/ftrace: Check set_event_pid result
      selftests/ftrace: Add kprobe event with $comm argument testcase
      selftests/ftrace: Add kprobe profile testcase
      selftests/ftrace: Add a testcase for nop tracer
      selftests/ftrace: Add kprobe-event with symbol argument test
      selftests/ftrace: Add trace_printk sample module test
      selftests/ftrace: Add ringbuffer size changing testcase
      selftests/ftrace: Add function profiling stat testcase
      selftests/ftrace: Add max stack tracer testcase
      selftests/ftrace: Add function filter on module testcase
      selftests/ftrace: Add trace_pipe testcase
      selftests/ftrace: Add stacktrace ftrace filter command testcase
      selftests/ftrace: Add wakeup tracer testcase
      selftests/ftrace: Add wakeup_rt tracer testcase
      selftests/ftrace: Add ftrace cpumask testcase
      selftests/ftrace: Add output format testcase
      selftests/ftrace: Add blktrace testcase


 kernel/trace/Kconfig                               |   13 +++
 kernel/trace/Makefile                              |    5 +
 tools/testing/selftests/ftrace/config              |    7 ++
 tools/testing/selftests/ftrace/ftracetest          |   32 ++++++-
 .../ftrace/test.d/00basic/print_format.tc          |   51 +++++++++++
 .../ftrace/test.d/00basic/ringbuffer_size.tc       |   21 +++++
 .../selftests/ftrace/test.d/00basic/trace_pipe.tc  |   15 +++
 .../selftests/ftrace/test.d/event/event-enable.tc  |    8 --
 .../selftests/ftrace/test.d/event/event-pid.tc     |    6 +
 .../ftrace/test.d/event/subsystem-enable.tc        |    8 --
 .../ftrace/test.d/event/toplevel-enable.tc         |    8 --
 .../selftests/ftrace/test.d/event/trace_printk.tc  |   27 ++++++
 .../ftrace/test.d/ftrace/fgraph-filter-stack.tc    |    4 -
 .../ftrace/test.d/ftrace/fgraph-filter.tc          |    9 --
 .../ftrace/test.d/ftrace/func-filter-pid.tc        |    8 --
 .../ftrace/test.d/ftrace/func-filter-stacktrace.tc |   12 +++
 .../selftests/ftrace/test.d/ftrace/func_cpumask.tc |   34 +++++++
 .../ftrace/test.d/ftrace/func_event_triggers.tc    |    3 -
 .../ftrace/test.d/ftrace/func_mod_trace.tc         |   24 +++++
 .../ftrace/test.d/ftrace/func_profile_stat.tc      |   23 +++++
 .../ftrace/test.d/ftrace/func_profiler.tc          |    4 -
 .../ftrace/test.d/ftrace/func_set_ftrace_file.tc   |   13 ---
 .../ftrace/test.d/ftrace/func_stack_tracer.tc      |   39 +++++++++
 .../test.d/ftrace/func_traceonoff_triggers.tc      |   11 --
 tools/testing/selftests/ftrace/test.d/functions    |    5 +
 .../ftrace/test.d/kprobe/add_and_remove.tc         |    3 -
 .../selftests/ftrace/test.d/kprobe/busy_check.tc   |    3 -
 .../selftests/ftrace/test.d/kprobe/kprobe_args.tc  |    8 +-
 .../ftrace/test.d/kprobe/kprobe_args_comm.tc       |   17 ++++
 .../ftrace/test.d/kprobe/kprobe_args_string.tc     |    5 -
 .../ftrace/test.d/kprobe/kprobe_args_symbol.tc     |   39 +++++++++
 .../ftrace/test.d/kprobe/kprobe_args_syntax.tc     |    8 +-
 .../ftrace/test.d/kprobe/kprobe_args_type.tc       |   52 +++++++----
 .../ftrace/test.d/kprobe/kprobe_eventname.tc       |    5 -
 .../ftrace/test.d/kprobe/kprobe_ftrace.tc          |    9 --
 .../ftrace/test.d/kprobe/kprobe_module.tc          |   36 +++++++-
 .../ftrace/test.d/kprobe/kretprobe_args.tc         |    9 +-
 .../ftrace/test.d/kprobe/kretprobe_maxactive.tc    |    4 -
 .../ftrace/test.d/kprobe/multiple_kprobes.tc       |    5 -
 .../selftests/ftrace/test.d/kprobe/probepoint.tc   |    4 -
 .../selftests/ftrace/test.d/kprobe/profile.tc      |   15 +++
 tools/testing/selftests/ftrace/test.d/template     |    1 
 .../testing/selftests/ftrace/test.d/tracer/blk.tc  |   91 ++++++++++++++++++++
 .../testing/selftests/ftrace/test.d/tracer/nop.tc  |   22 +++++
 .../selftests/ftrace/test.d/tracer/wakeup.tc       |   25 +++++
 .../selftests/ftrace/test.d/tracer/wakeup_rt.tc    |   25 +++++
 .../inter-event/trigger-extended-error-support.tc  |   12 ---
 .../inter-event/trigger-field-variable-support.tc  |   15 ---
 .../trigger-inter-event-combined-hist.tc           |   15 ---
 .../inter-event/trigger-multi-actions-accept.tc    |   14 ---
 .../inter-event/trigger-onmatch-action-hist.tc     |   15 ---
 .../trigger-onmatch-onmax-action-hist.tc           |   15 ---
 .../inter-event/trigger-onmax-action-hist.tc       |   15 ---
 .../trigger-synthetic-event-createremove.tc        |   12 ---
 .../ftrace/test.d/trigger/trigger-eventonoff.tc    |   12 ---
 .../ftrace/test.d/trigger/trigger-filter.tc        |   14 ---
 .../ftrace/test.d/trigger/trigger-hist-mod.tc      |   12 ---
 .../ftrace/test.d/trigger/trigger-hist.tc          |   12 ---
 .../ftrace/test.d/trigger/trigger-multihist.tc     |   16 ----
 .../ftrace/test.d/trigger/trigger-snapshot.tc      |   12 ---
 .../ftrace/test.d/trigger/trigger-stacktrace.tc    |   12 ---
 .../test.d/trigger/trigger-trace-marker-hist.tc    |   11 --
 .../trigger/trigger-trace-marker-snapshot.tc       |   16 ----
 .../trigger-trace-marker-synthetic-kernel.tc       |   12 ---
 .../trigger/trigger-trace-marker-synthetic.tc      |   12 ---
 .../ftrace/test.d/trigger/trigger-traceonoff.tc    |   12 ---
 66 files changed, 630 insertions(+), 412 deletions(-)
 create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/print_format.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/trace_pipe.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/event/trace_printk.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func_mod_trace.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func_profile_stat.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/tracer/blk.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/tracer/nop.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/tracer/wakeup.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/tracer/wakeup_rt.tc

--
Masami Hiramatsu (Linaro)

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