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Date: Wed, 26 May 2021 10:57:11 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Riccardo Mancini <rickyman7@...il.com>,
Namhyung Kim <namhyung@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...hat.com>, Leo Yan <leo.yan@...aro.org>,
Fabian Hemmer <copy@...y.sh>,
Tommi Rantala <tommi.t.rantala@...ia.com>,
Stephane Eranian <eranian@...gle.com>,
linux-perf-users <linux-perf-users@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf test: iterate over shell tests in alphabetical order
Em Tue, May 25, 2021 at 04:25:48PM -0700, Ian Rogers escreveu:
> On Tue, May 25, 2021 at 4:08 PM Riccardo Mancini <rickyman7@...il.com> wrote:
> >
> > for_each_shell_test macro iterated over all shell tests in the directory
> > using readdir, which does not guarantee any ordering, causing
> > problems on certain fs. However, the order in which they are visited
> > determines the id of the test, in case one wants to run a single test.
> >
> > This patch replaces readdir with scandir using alphabetical sorting.
> > This guarantees that, given the same set of tests, all machines will
> > see the tests in the same order, and, thus, that test ids are
> > consistent.
> >
> > Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
> > Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> > Cc: Namhyung Kim <namhyung@...nel.org>
> > Cc: Ian Rogers <irogers@...gle.com>
>
> Acked-by: Ian Rogers <irogers@...gle.com>
>
> > ---
> > tools/perf/tests/builtin-test.c | 38 ++++++++++++++++++---------------
> > 1 file changed, 21 insertions(+), 17 deletions(-)
> >
> > diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> > index c4b888f18e9ca..cbbfe48ab8029 100644
> > --- a/tools/perf/tests/builtin-test.c
> > +++ b/tools/perf/tests/builtin-test.c
> > @@ -510,8 +510,8 @@ static const char *shell_test__description(char *description, size_t size,
> > return description ? strim(description + 1) : NULL;
> > }
> >
> > -#define for_each_shell_test(dir, base, ent) \
> > - while ((ent = readdir(dir)) != NULL) \
[acme@...e perf]$ grep '(int i =' */*/*.c
tools/perf/builtin-diff.c: for (int i = 0; i < num; i++)
tools/perf/builtin-diff.c: for (int i = 0; i < pair->block_info->num; i++) {
tools/perf/builtin-stat.c: for (int i = 0; i < a->core.cpus->nr; i++) {
[acme@...e perf]$ grep '(int i =' */*/*/*.c
tools/lib/subcmd/parse-options.c: for (int i = 0; subcommands[i]; i++) {
tools/lib/subcmd/parse-options.c: for (int i = 0; subcommands[i]; i++)
tools/perf/util/block-info.c: for (int i = 0; i < nr_hpps; i++)
tools/perf/util/block-info.c: for (int i = 0; i < nr_hpps; i++) {
tools/perf/util/block-info.c: for (int i = 0; i < nr_reps; i++)
tools/perf/util/header.c: for (int i = 0; i < ff->ph->env.nr_hybrid_cpc_nodes; i++) {
tools/perf/util/stat-display.c: for (int i = 0; i < evsel__nr_cpus(counter); i++) {
tools/perf/util/stream.c: for (int i = 0; i < nr_evsel; i++)
tools/perf/util/stream.c: for (int i = 0; i < nr_evsel; i++) {
tools/perf/util/stream.c: for (int i = 0; i < els->nr_evsel; i++) {
tools/perf/util/stream.c: for (int i = 0; i < es_pair->nr_streams; i++) {
tools/perf/util/stream.c: for (int i = 0; i < es_base->nr_streams; i++) {
[acme@...e perf]$ > > +#define for_each_shell_test(entlist, nr, base, ent) \
And this has been building OK since forever, it seems, in all the test
build containers, with tons of gcc and clang versions, so I don't think
this is a problem.
- Arnaldo
> > + for (int __i = 0; __i < nr && (ent = entlist[__i]); __i++) \
>
> I think this declaration of __i is okay as C99 allows declarations
> here, but generally I don't see this style in the kernel.
Yeah, but there is precendence in.. tools/perf/:
> Thanks,
> Ian
>
> > if (!is_directory(base, ent) && ent->d_name[0] != '.')
> >
> > static const char *shell_tests__dir(char *path, size_t size)
> > @@ -538,8 +538,9 @@ static const char *shell_tests__dir(char *path, size_t size)
> >
> > static int shell_tests__max_desc_width(void)
> > {
> > - DIR *dir;
> > + struct dirent **entlist;
> > struct dirent *ent;
> > + int n_dirs;
> > char path_dir[PATH_MAX];
> > const char *path = shell_tests__dir(path_dir, sizeof(path_dir));
> > int width = 0;
> > @@ -547,11 +548,11 @@ static int shell_tests__max_desc_width(void)
> > if (path == NULL)
> > return -1;
> >
> > - dir = opendir(path);
> > - if (!dir)
> > + n_dirs = scandir(path, &entlist, NULL, alphasort);
> > + if (n_dirs == -1)
> > return -1;
> >
> > - for_each_shell_test(dir, path, ent) {
> > + for_each_shell_test(entlist, n_dirs, path, ent) {
> > char bf[256];
> > const char *desc = shell_test__description(bf, sizeof(bf), path, ent->d_name);
> >
> > @@ -563,7 +564,8 @@ static int shell_tests__max_desc_width(void)
> > }
> > }
> >
> > - closedir(dir);
> > + free(entlist);
> > +
> > return width;
> > }
> >
> > @@ -589,8 +591,9 @@ static int shell_test__run(struct test *test, int subdir __maybe_unused)
> >
> > static int run_shell_tests(int argc, const char *argv[], int i, int width)
> > {
> > - DIR *dir;
> > + struct dirent **entlist;
> > struct dirent *ent;
> > + int n_dirs;
> > char path_dir[PATH_MAX];
> > struct shell_test st = {
> > .dir = shell_tests__dir(path_dir, sizeof(path_dir)),
> > @@ -599,14 +602,14 @@ static int run_shell_tests(int argc, const char *argv[], int i, int width)
> > if (st.dir == NULL)
> > return -1;
> >
> > - dir = opendir(st.dir);
> > - if (!dir) {
> > + n_dirs = scandir(st.dir, &entlist, NULL, alphasort);
> > + if (n_dirs == -1) {
> > pr_err("failed to open shell test directory: %s\n",
> > st.dir);
> > return -1;
> > }
> >
> > - for_each_shell_test(dir, st.dir, ent) {
> > + for_each_shell_test(entlist, n_dirs, st.dir, ent) {
> > int curr = i++;
> > char desc[256];
> > struct test test = {
> > @@ -623,7 +626,7 @@ static int run_shell_tests(int argc, const char *argv[], int i, int width)
> > test_and_print(&test, false, -1);
> > }
> >
> > - closedir(dir);
> > + free(entlist);
> > return 0;
> > }
> >
> > @@ -722,19 +725,20 @@ static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist)
> >
> > static int perf_test__list_shell(int argc, const char **argv, int i)
> > {
> > - DIR *dir;
> > + struct dirent **entlist;
> > struct dirent *ent;
> > + int n_dirs;
> > char path_dir[PATH_MAX];
> > const char *path = shell_tests__dir(path_dir, sizeof(path_dir));
> >
> > if (path == NULL)
> > return -1;
> >
> > - dir = opendir(path);
> > - if (!dir)
> > + n_dirs = scandir(path, &entlist, NULL, alphasort);
> > + if (n_dirs == -1)
> > return -1;
> >
> > - for_each_shell_test(dir, path, ent) {
> > + for_each_shell_test(entlist, n_dirs, path, ent) {
> > int curr = i++;
> > char bf[256];
> > struct test t = {
> > @@ -747,7 +751,7 @@ static int perf_test__list_shell(int argc, const char **argv, int i)
> > pr_info("%2d: %s\n", i, t.desc);
> > }
> >
> > - closedir(dir);
> > + free(entlist);
> > return 0;
> > }
> >
> > --
> > 2.31.1
> >
--
- Arnaldo
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