Hi Ilpo,
On 9/11/2023 4:19 AM, Ilpo Järvinen wrote:
> Unmounting resctrl FS has been moved into the per test functions in
> resctrl_tests.c by commit caddc0fbe495 ("selftests/resctrl: Move
> resctrl FS mount/umount to higher level"). In case a signal (SIGINT,
> SIGTERM, or SIGHUP) is received, the running selftest is aborted by
> ctrlc_handler() which then unmounts resctrl fs before exiting. The
> current section between signal_handler_register() and
> signal_handler_unregister(), however, does not cover the entire
> duration when resctrl FS is mounted.
>
> Move signal_handler_register() and signal_handler_unregister() call
> into the test functions in resctrl_tests.c to properly unmount resctrl
> fs. Adjust child process kill() call in ctrlc_handler() to only be
> invoked if the child was already forked.
Thank you for catching this.
>
> Fixes: caddc0fbe495 ("selftests/resctrl: Move resctrl FS mount/umount to higher level")
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx>
> ---
> tools/testing/selftests/resctrl/cat_test.c | 8 -------
> .../testing/selftests/resctrl/resctrl_tests.c | 24 +++++++++++++++++++
> tools/testing/selftests/resctrl/resctrl_val.c | 22 ++++++++---------
> 3 files changed, 34 insertions(+), 20 deletions(-)
>
> diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
> index 97b87285ab2a..224ba8544d8a 100644
> --- a/tools/testing/selftests/resctrl/cat_test.c
> +++ b/tools/testing/selftests/resctrl/cat_test.c
> @@ -167,12 +167,6 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
> strcpy(param.filename, RESULT_FILE_NAME1);
> param.num_of_runs = 0;
> param.cpu_no = sibling_cpu_no;
> - } else {
> - ret = signal_handler_register();
> - if (ret) {
> - kill(bm_pid, SIGKILL);
> - goto out;
> - }
> }
>
> remove(param.filename);
> @@ -209,10 +203,8 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
> }
> close(pipefd[0]);
> kill(bm_pid, SIGKILL);
> - signal_handler_unregister();
> }
>
> -out:
> cat_test_cleanup();
>
> return ret;
> diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
> index 823672a20a43..3d66fbdc2df3 100644
> --- a/tools/testing/selftests/resctrl/resctrl_tests.c
> +++ b/tools/testing/selftests/resctrl/resctrl_tests.c
> @@ -73,8 +73,13 @@ static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no)
>
> ksft_print_msg("Starting MBM BW change ...\n");
>
> + res = signal_handler_register();
> + if (res)
> + return;
> +
> res = mount_resctrlfs();
> if (res) {
> + signal_handler_unregister();
> ksft_exit_fail_msg("Failed to mount resctrl FS\n");
> return;
> }
> @@ -91,6 +96,7 @@ static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no)
>
> umount:
> umount_resctrlfs();
> + signal_handler_unregister();
> }
>
> static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
> @@ -99,8 +105,13 @@ static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
>
> ksft_print_msg("Starting MBA Schemata change ...\n");
>
> + res = signal_handler_register();
> + if (res)
> + return;
> +
> res = mount_resctrlfs();
> if (res) {
> + signal_handler_unregister();
> ksft_exit_fail_msg("Failed to mount resctrl FS\n");
> return;
> }
> @@ -115,6 +126,7 @@ static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
>
> umount:
> umount_resctrlfs();
> + signal_handler_unregister();
> }
>
This adds more duplicated code for every test. Have you considered a
single test setup function that can be used to mount resctrl FS and setup
the signal handler paired with a single test teardown function?
Reinette
