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Date: Fri, 9 Feb 2024 20:41:18 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>, Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
Ravi Bangoria <ravi.bangoria@....com>, James Clark <james.clark@....com>,
Kan Liang <kan.liang@...ux.intel.com>, John Garry <john.g.garry@...cle.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
llvm@...ts.linux.dev
Subject: Re: [PATCH v2 7/9] perf tests: Run time generate shell test suites
On Wed, Jan 31, 2024 at 4:15 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Rather than special shell test logic, do a single pass to create an
> array of test suites. Hold the shell test file name in the test suite
> priv field. This makes the special shell test logic in builtin-test.c
> redundant so remove it.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/tests/builtin-test.c | 91 +----------------------
> tools/perf/tests/tests-scripts.c | 120 ++++++++++++++++++-------------
> tools/perf/tests/tests-scripts.h | 10 +--
> 3 files changed, 74 insertions(+), 147 deletions(-)
>
> diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> index 6d5001daaf63..c42cb40fc242 100644
> --- a/tools/perf/tests/builtin-test.c
> +++ b/tools/perf/tests/builtin-test.c
> @@ -130,6 +130,7 @@ static struct test_suite *generic_tests[] = {
> static struct test_suite **tests[] = {
> generic_tests,
> arch_tests,
> + NULL, /* shell tests created at runtime. */
> };
>
> static struct test_workload *workloads[] = {
> @@ -299,74 +300,12 @@ static int test_and_print(struct test_suite *t, int subtest)
> return err;
> }
>
> -struct shell_test {
> - const char *file;
> -};
> -
> -static int shell_test__run(struct test_suite *test, int subdir __maybe_unused)
> -{
> - int err;
> - struct shell_test *st = test->priv;
> - char *cmd;
> -
> - asprintf(&cmd, "%s%s", st->file, verbose ? " -v" : "");
> - if (!cmd)
> - return TEST_FAIL;
> - err = system(cmd);
> - free(cmd);
> - if (!err)
> - return TEST_OK;
> -
> - return WEXITSTATUS(err) == 2 ? TEST_SKIP : TEST_FAIL;
> -}
> -
> -static int run_shell_tests(int argc, const char *argv[], int i, int width,
> - struct intlist *skiplist)
> -{
> - struct shell_test st;
> - const struct script_file *files, *file;
> -
> - files = list_script_files();
> - if (!files)
> - return 0;
> - for (file = files; file->file; file++) {
> - int curr = i++;
> - struct test_case test_cases[] = {
> - {
> - .desc = file->desc,
> - .run_case = shell_test__run,
> - },
> - { .name = NULL, }
> - };
> - struct test_suite test_suite = {
> - .desc = test_cases[0].desc,
> - .test_cases = test_cases,
> - .priv = &st,
> - };
> - st.file = file->file;
> -
> - if (test_suite.desc == NULL ||
> - !perf_test__matches(test_suite.desc, curr, argc, argv))
> - continue;
> -
> - pr_info("%3d: %-*s:", i, width, test_suite.desc);
> -
> - if (intlist__find(skiplist, i)) {
> - color_fprintf(stderr, PERF_COLOR_YELLOW, " Skip (user override)\n");
> - continue;
> - }
> -
> - test_and_print(&test_suite, 0);
> - }
> - return 0;
> -}
> -
> static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist)
> {
> struct test_suite *t;
> unsigned int j, k;
> int i = 0;
> - int width = list_script_max_width();
> + int width = 0;
>
> for_each_test(j, k, t) {
> int len = strlen(test_description(t, -1));
> @@ -441,28 +380,6 @@ static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist)
> }
> }
> }
> -
> - return run_shell_tests(argc, argv, i, width, skiplist);
> -}
> -
> -static int perf_test__list_shell(int argc, const char **argv, int i)
> -{
> - const struct script_file *files, *file;
> -
> - files = list_script_files();
> - if (!files)
> - return 0;
> - for (file = files; file->file; file++) {
> - int curr = i++;
> - struct test_suite t = {
> - .desc = file->desc
> - };
> -
> - if (!perf_test__matches(t.desc, curr, argc, argv))
> - continue;
> -
> - pr_info("%3d: %s\n", i, t.desc);
> - }
> return 0;
> }
>
> @@ -489,9 +406,6 @@ static int perf_test__list(int argc, const char **argv)
> test_description(t, subi));
> }
> }
> -
> - perf_test__list_shell(argc, argv, i);
> -
> return 0;
> }
>
> @@ -551,6 +465,7 @@ int cmd_test(int argc, const char **argv)
> /* Unbuffered output */
> setvbuf(stdout, NULL, _IONBF, 0);
>
> + tests[2] = create_script_test_suites();
I like this part! :)
> argc = parse_options_subcommand(argc, argv, test_options, test_subcommands, test_usage, 0);
> if (argc >= 1 && !strcmp(argv[0], "list"))
> return perf_test__list(argc - 1, argv + 1);
> diff --git a/tools/perf/tests/tests-scripts.c b/tools/perf/tests/tests-scripts.c
> index 9b3b66dd5508..b92a93c251c6 100644
> --- a/tools/perf/tests/tests-scripts.c
> +++ b/tools/perf/tests/tests-scripts.c
> @@ -26,16 +26,6 @@
> #include "tests.h"
> #include "util/rlimit.h"
>
> -
> -/*
> - * As this is a singleton built once for the run of the process, there is
> - * no value in trying to free it and just let it stay around until process
> - * exits when it's cleaned up.
> - */
> -static size_t files_num = 0;
> -static struct script_file *files = NULL;
> -static int files_max_width = 0;
> -
> static int shell_tests__dir_fd(void)
> {
> char path[PATH_MAX], *exec_path;
> @@ -131,12 +121,31 @@ static char *strdup_check(const char *str)
> return newstr;
> }
>
> -static void append_script(int dir_fd, const char *name, char *desc)
> +static int shell_test__run(struct test_suite *test, int subtest __maybe_unused)
> +{
> + const char *file = test->priv;
> + int err;
> + char *cmd;
> +
> + asprintf(&cmd, "%s%s", file, verbose ? " -v" : "");
> + if (!cmd)
> + return TEST_FAIL;
> + err = system(cmd);
> + free(cmd);
> + if (!err)
> + return TEST_OK;
> +
> + return WEXITSTATUS(err) == 2 ? TEST_SKIP : TEST_FAIL;
> +}
> +
> +static void append_script(int dir_fd, const char *name, char *desc,
> + struct test_suite ***result,
> + size_t *result_sz)
> {
> char filename[PATH_MAX], link[128];
> - struct script_file *files_tmp;
> - size_t files_num_tmp, len;
> - int width;
> + struct test_suite *test_suite, **result_tmp;
> + struct test_case *tests;
> + size_t len;
>
> snprintf(link, sizeof(link), "/proc/%d/fd/%d", getpid(), dir_fd);
> len = readlink(link, filename, sizeof(filename));
> @@ -146,33 +155,43 @@ static void append_script(int dir_fd, const char *name, char *desc)
> }
> filename[len++] = '/';
> strcpy(&filename[len], name);
> - files_num_tmp = files_num + 1;
> - if (files_num_tmp >= SIZE_MAX) {
> - pr_err("Too many script files\n");
> - abort();
> +
> + tests = calloc(2, sizeof(*tests));
> + if (!tests) {
> + pr_err("Out of memory while building script test suite list\n");
> + return;
> + }
> + tests[0].name = strdup_check(name);
> + tests[0].desc = strdup_check(desc);
> + tests[0].run_case = shell_test__run;
> +
> + test_suite = zalloc(sizeof(*test_suite));
> + if (!test_suite) {
> + pr_err("Out of memory while building script test suite list\n");
> + free(tests);
> + return;
> }
> + test_suite->desc = desc;
> + test_suite->test_cases = tests;
> + test_suite->priv = strdup_check(filename);
> /* Realloc is good enough, though we could realloc by chunks, not that
> * anyone will ever measure performance here */
> - files_tmp = realloc(files,
> - (files_num_tmp + 1) * sizeof(struct script_file));
> - if (files_tmp == NULL) {
> - pr_err("Out of memory while building test list\n");
> - abort();
> + result_tmp = realloc(*result, (*result_sz + 1) * sizeof(*result_tmp));
> + if (result_tmp == NULL) {
> + pr_err("Out of memory while building script test suite list\n");
> + free(tests);
> + free(test_suite);
> + return;
> }
> /* Add file to end and NULL terminate the struct array */
> - files = files_tmp;
> - files_num = files_num_tmp;
> - files[files_num - 1].file = strdup_check(filename);
> - files[files_num - 1].desc = desc;
> - files[files_num].file = NULL;
> - files[files_num].desc = NULL;
> -
> - width = strlen(desc); /* Track max width of desc */
> - if (width > files_max_width)
> - files_max_width = width;
> + *result = result_tmp;
> + (*result)[*result_sz] = test_suite;
> + (*result_sz)++;
> }
>
> -static void append_scripts_in_dir(int dir_fd)
> +static void append_scripts_in_dir(int dir_fd,
> + struct test_suite ***result,
> + size_t *result_sz)
> {
> struct dirent **entlist;
> struct dirent *ent;
> @@ -191,7 +210,7 @@ static void append_scripts_in_dir(int dir_fd)
> char *desc = shell_test__description(dir_fd, ent->d_name);
>
> if (desc) /* It has a desc line - valid script */
> - append_script(dir_fd, ent->d_name, desc);
> + append_script(dir_fd, ent->d_name, desc, result, result_sz);
> continue;
> }
> if (ent->d_type != DT_DIR) {
> @@ -204,32 +223,31 @@ static void append_scripts_in_dir(int dir_fd)
> continue;
> }
> fd = openat(dir_fd, ent->d_name, O_PATH);
> - append_scripts_in_dir(fd);
> + append_scripts_in_dir(fd, result, result_sz);
> }
> for (i = 0; i < n_dirs; i++) /* Clean up */
> zfree(&entlist[i]);
> free(entlist);
> }
>
> -const struct script_file *list_script_files(void)
> +struct test_suite **create_script_test_suites(void)
> {
> - int dir_fd;
> -
> - if (files)
> - return files; /* Singleton - we already know our list */
> + struct test_suite **result = NULL, **result_tmp;
> + size_t result_sz = 0;
> + int dir_fd = shell_tests__dir_fd(); /* Walk dir */
>
> - dir_fd = shell_tests__dir_fd(); /* Walk dir */
> if (dir_fd < 0)
> return NULL;
When can it fail? If the test directory doesn't exist?
I'm afraid returning NULL here can crash perf test.
I think you need to return a NULL entry result.
Thanks,
Namhyung
>
> - append_scripts_in_dir(dir_fd);
> + append_scripts_in_dir(dir_fd, &result, &result_sz);
> + result_tmp = realloc(result, (result_sz + 1) * sizeof(*result_tmp));
> + if (result_tmp == NULL) {
> + pr_err("Out of memory while building script test suite list\n");
> + abort();
> + }
> + /* NULL terminate the test suite array. */
> + result = result_tmp;
> + result[result_sz] = NULL;
> close(dir_fd);
> -
> - return files;
> -}
> -
> -int list_script_max_width(void)
> -{
> - list_script_files(); /* Ensure we have scanned all scripts */
> - return files_max_width;
> + return result;
> }
> diff --git a/tools/perf/tests/tests-scripts.h b/tools/perf/tests/tests-scripts.h
> index 3508a293aaf9..b553ad26ea17 100644
> --- a/tools/perf/tests/tests-scripts.h
> +++ b/tools/perf/tests/tests-scripts.h
> @@ -2,14 +2,8 @@
> #ifndef TESTS_SCRIPTS_H
> #define TESTS_SCRIPTS_H
>
> -struct script_file {
> - char *file;
> - char *desc;
> -};
> +#include "tests.h"
>
> -/* List available script tests to run - singleton - never freed */
> -const struct script_file *list_script_files(void);
> -/* Get maximum width of description string */
> -int list_script_max_width(void);
> +struct test_suite **create_script_test_suites(void);
>
> #endif /* TESTS_SCRIPTS_H */
> --
> 2.43.0.429.g432eaa2c6b-goog
>
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