Re: [PATCH v2 3/3] test: support trace-autotest when enable trace

[David Marchand <david.marchand@redhat.com>]

On Tue, Jun 14, 2022 at 8:06 AM Chengwen Feng <fengchengwen@huawei.com> wrote:
>
> There are a bug[1] when exit application while enable tracing, this
> bug has not been discovered for a long time, to quickly detect such
> bugs, this patch was introduced.
>
> This patch adds a testcase with trace enabling, it also depends on
> patch[2] because it has a long file-prefix.
>
> [1] eal: fix segment fault when exit trace
> [2] eal: fix trace init fail with long file-prefix

This commitlog feels more like a cover letter.

Please describe what the impact of the patch is, like mention that the
trace_autotest unit test is being called twice, once with traces
disabled, and once with traces enabled.
And that the traces file is being written in a directory part of the
build directory.


>
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> ---
>  app/test/meson.build | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/app/test/meson.build b/app/test/meson.build
> index 7fe261cae8..eb37aa632a 100644
> --- a/app/test/meson.build
> +++ b/app/test/meson.build
> @@ -509,6 +509,17 @@ foreach arg : fast_tests
>                  is_parallel : false,
>                  suite : 'fast-tests')
>      endif
> +
> +    if run_test and arg[0] == 'trace_autotest' and (not is_windows)

Calling this test on Windows should not be an issue.
Is it not the case?


> +        test_args += ['--trace=.*']
> +        test_args += ['--trace-dir=@0@'.format(meson.current_build_dir())]
> +        test(arg[0], dpdk_test,

58/68 DPDK:fast-tests / trace_autotest                   OK              0.16s
59/68 DPDK:fast-tests / trace_autotest                   OK              0.16s

By using the same test name, it's hard to tell what the difference is
between those two lines.
And practically, as a developer reproducing/troubleshooting a test
failure, you can't call only one of the test case.

I am not sure what could be done to enhance this.., how about using a
dedicated test name?
Like below snippet, replacing the whole proposed patch:

@@ -508,6 +508,16 @@ foreach arg : fast_tests
                 timeout : timeout_seconds_fast,
                 is_parallel : false,
                 suite : 'fast-tests')
+        if arg[0] == 'trace_autotest'
+            test_args += ['--trace=.*']
+            test_args += ['--trace-dir=@0@'.format(meson.current_build_dir())]
+            test(arg[0] + '_with_traces', dpdk_test,
+                    env : ['DPDK_TEST=' + arg[0]],
+                    args : test_args,
+                    timeout : timeout_seconds_fast,
+                    is_parallel : false,
+                    suite : 'fast-tests')
+        endif
     endif
 endforeach


-- 
David Marchand