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Date: Mon, 4 Dec 2023 17:30:09 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: 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@...nel.org>,
Namhyung Kim <namhyung@...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 v1 9/9] perf tests: Add option to run tests in parallel
Em Fri, Dec 01, 2023 at 06:06:12PM -0800, Ian Rogers escreveu:
> On Fri, Dec 1, 2023 at 3:50 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > By default tests are forked, add an option (-p or --parallel) so that
> > the forked tests are all started in parallel and then their output
> > gathered serially. This is opt-in as running in parallel can cause
> > test flakes.
> >
> > Rather than fork within the code, the start_command/finish_command
> > from libsubcmd are used. This changes how stderr and stdout are
> > handled.
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
>
> Actually, I think this patch needs more work. The verbose output is
> degraded and missing in some cases. Suggestions on how to fix welcome.
I'll think about, but to make progress I think the first 8 patches in
this series can be considered now?
- Arnaldo
> It'd be nice to fix up the tests and allow parallel to be the default.
> The first patch in this series is 1 such fix. Another is needed to
> make "Couldn't resolve comm name for pid" silent in the cases where it
> is racy. I was also noticing hangs on things like the lock contention
> test. The good news is the tests are doing their job of finding bugs.
>
> Thanks,
> Ian
>
>
> > ---
> > tools/perf/tests/builtin-test.c | 261 +++++++++++++++++++++-----------
> > 1 file changed, 169 insertions(+), 92 deletions(-)
> >
> > diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> > index 54b11c23e863..91c32b477cbb 100644
> > --- a/tools/perf/tests/builtin-test.c
> > +++ b/tools/perf/tests/builtin-test.c
> > @@ -21,6 +21,7 @@
> > #include "debug.h"
> > #include "color.h"
> > #include <subcmd/parse-options.h>
> > +#include <subcmd/run-command.h>
> > #include "string2.h"
> > #include "symbol.h"
> > #include "util/rlimit.h"
> > @@ -31,7 +32,13 @@
> >
> > #include "tests-scripts.h"
> >
> > +/*
> > + * Command line option to not fork the test running in the same process and
> > + * making them easier to debug.
> > + */
> > static bool dont_fork;
> > +/* Fork the tests in parallel and then wait for their completion. */
> > +static bool parallel;
> > const char *dso_to_test;
> > const char *test_objdump_path = "objdump";
> >
> > @@ -211,76 +218,36 @@ static bool perf_test__matches(const char *desc, int curr, int argc, const char
> > return false;
> > }
> >
> > -static int run_test(struct test_suite *test, int subtest)
> > -{
> > - int status, err = -1, child = dont_fork ? 0 : fork();
> > - char sbuf[STRERR_BUFSIZE];
> > -
> > - if (child < 0) {
> > - pr_err("failed to fork test: %s\n",
> > - str_error_r(errno, sbuf, sizeof(sbuf)));
> > - return -1;
> > - }
> > -
> > - if (!child) {
> > - if (!dont_fork) {
> > - pr_debug("test child forked, pid %d\n", getpid());
> > -
> > - if (verbose <= 0) {
> > - int nullfd = open("/dev/null", O_WRONLY);
> > -
> > - if (nullfd >= 0) {
> > - close(STDERR_FILENO);
> > - close(STDOUT_FILENO);
> > -
> > - dup2(nullfd, STDOUT_FILENO);
> > - dup2(STDOUT_FILENO, STDERR_FILENO);
> > - close(nullfd);
> > - }
> > - } else {
> > - signal(SIGSEGV, sighandler_dump_stack);
> > - signal(SIGFPE, sighandler_dump_stack);
> > - }
> > - }
> > -
> > - err = test_function(test, subtest)(test, subtest);
> > - if (!dont_fork)
> > - exit(err);
> > - }
> > -
> > - if (!dont_fork) {
> > - wait(&status);
> > +struct child_test {
> > + struct child_process process;
> > + struct test_suite *test;
> > + int test_num;
> > + int subtest;
> > +};
> >
> > - if (WIFEXITED(status)) {
> > - err = (signed char)WEXITSTATUS(status);
> > - pr_debug("test child finished with %d\n", err);
> > - } else if (WIFSIGNALED(status)) {
> > - err = -1;
> > - pr_debug("test child interrupted\n");
> > - }
> > - }
> > +static int run_test_child(struct child_process *process)
> > +{
> > + struct child_test *child = container_of(process, struct child_test, process);
> > + int err;
> >
> > - return err;
> > + pr_debug("--- start ---\n");
> > + pr_debug("test child forked, pid %d\n", getpid());
> > + err = test_function(child->test, child->subtest)(child->test, child->subtest);
> > + pr_debug("---- end(%d) ----\n", err);
> > + fflush(NULL);
> > + return -err;
> > }
> >
> > -#define for_each_test(j, k, t) \
> > - for (j = 0, k = 0; j < ARRAY_SIZE(tests); j++, k = 0) \
> > - while ((t = tests[j][k++]) != NULL)
> > -
> > -static int test_and_print(struct test_suite *t, int subtest)
> > +static int print_test_result(struct test_suite *t, int i, int subtest, int result, int width)
> > {
> > - int err;
> > -
> > - pr_debug("\n--- start ---\n");
> > - err = run_test(t, subtest);
> > - pr_debug("---- end ----\n");
> > + if (has_subtests(t)) {
> > + int subw = width > 2 ? width - 2 : width;
> >
> > - if (!has_subtests(t))
> > - pr_debug("%s:", t->desc);
> > - else
> > - pr_debug("%s subtest %d:", t->desc, subtest + 1);
> > + pr_info("%3d.%1d: %-*s:", i + 1, subtest + 1, subw, test_description(t, subtest));
> > + } else
> > + pr_info("%3d: %-*s:", i + 1, width, test_description(t, subtest));
> >
> > - switch (err) {
> > + switch (result) {
> > case TEST_OK:
> > pr_info(" Ok\n");
> > break;
> > @@ -299,22 +266,135 @@ static int test_and_print(struct test_suite *t, int subtest)
> > break;
> > }
> >
> > - return err;
> > + return 0;
> > +}
> > +
> > +static int finish_test(struct child_test *child_test, int width)
> > +{
> > + struct test_suite *t = child_test->test;
> > + int i = child_test->test_num;
> > + int subi = child_test->subtest;
> > + int out = child_test->process.out;
> > + int err = child_test->process.err;
> > + int ret;
> > +
> > + if (verbose) {
> > + bool out_done = false, err_done = false;
> > +
> > + fcntl(out, F_SETFL, O_NONBLOCK);
> > + fcntl(err, F_SETFL, O_NONBLOCK);
> > + if (has_subtests(t))
> > + pr_info("%3d.%1d: %s:\n", i + 1, subi + 1, test_description(t, subi));
> > + else
> > + pr_info("%3d: %s:\n", i + 1, test_description(t, -1));
> > +
> > + while (!out_done && !err_done) {
> > + char buf[512];
> > + ssize_t len;
> > +
> > + if (!out_done) {
> > + errno = 0;
> > + len = read(out, buf, sizeof(buf) - 1);
> > +
> > + if (len <= 0)
> > + err_done = errno != EAGAIN;
> > + else {
> > + buf[len] = '\0';
> > + fprintf(stdout, "%s", buf);
> > + }
> > + }
> > + if (!err_done) {
> > + errno = 0;
> > + len = read(err, buf, sizeof(buf) - 1);
> > +
> > + if (len <= 0)
> > + err_done = errno != EAGAIN;
> > + else {
> > + buf[len] = '\0';
> > + fprintf(stderr, "%s", buf);
> > + }
> > + }
> > + }
> > + }
> > + ret = finish_command(&child_test->process);
> > + print_test_result(t, i, subi, ret, width);
> > + if (out >= 0)
> > + close(out);
> > + if (err >= 0)
> > + close(err);
> > + return 0;
> > +}
> > +
> > +static int start_test(struct test_suite *test, int i, int subi, struct child_test **child,
> > + int width)
> > +{
> > + int err;
> > +
> > + *child = NULL;
> > + if (dont_fork) {
> > + pr_debug("--- start ---\n");
> > + err = test_function(test, subi)(test, subi);
> > + pr_debug("---- end ----\n");
> > + print_test_result(test, i, subi, err, width);
> > + return 0;
> > + }
> > +
> > + *child = zalloc(sizeof(**child));
> > + if (!*child)
> > + return -ENOMEM;
> > +
> > + (*child)->test = test;
> > + (*child)->test_num = i;
> > + (*child)->subtest = subi;
> > + (*child)->process.pid = -1;
> > + (*child)->process.no_stdin = 1;
> > + if (verbose <= 0) {
> > + (*child)->process.no_stdout = 1;
> > + (*child)->process.no_stderr = 1;
> > + } else {
> > + (*child)->process.out = -1;
> > + (*child)->process.err = -1;
> > + }
> > + (*child)->process.no_exec_cmd = run_test_child;
> > + err = start_command(&(*child)->process);
> > + if (err || parallel)
> > + return err;
> > + return finish_test(*child, width);
> > }
> >
> > +#define for_each_test(j, k, t) \
> > + for (j = 0, k = 0; j < ARRAY_SIZE(tests); j++, k = 0) \
> > + while ((t = tests[j][k++]) != NULL)
> > +
> > 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 = 0;
> > + size_t num_tests = 0;
> > + struct child_test **child_tests;
> > + int child_test_num = 0;
> >
> > for_each_test(j, k, t) {
> > int len = strlen(test_description(t, -1));
> >
> > if (width < len)
> > width = len;
> > +
> > + if (has_subtests(t)) {
> > + for (int l = 0, subn = num_subtests(t); l < subn; l++) {
> > + len = strlen(test_description(t, -1));
> > + if (width < len)
> > + width = len;
> > + num_tests++;
> > + }
> > + } else
> > + num_tests++;
> > }
> > + child_tests = calloc(num_tests, sizeof(*child_tests));
> > + if (!child_tests)
> > + return -ENOMEM;
> >
> > for_each_test(j, k, t) {
> > int curr = i++;
> > @@ -336,52 +416,47 @@ static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist)
> > continue;
> > }
> >
> > - pr_info("%3d: %-*s:", i, width, test_description(t, -1));
> > -
> > if (intlist__find(skiplist, i)) {
> > + pr_info("%3d: %-*s:", curr + 1, width, test_description(t, -1));
> > color_fprintf(stderr, PERF_COLOR_YELLOW, " Skip (user override)\n");
> > continue;
> > }
> >
> > if (!has_subtests(t)) {
> > - test_and_print(t, -1);
> > + int err = start_test(t, curr, -1, &child_tests[child_test_num++], width);
> > +
> > + if (err) {
> > + /* TODO: if parallel waitpid the already forked children. */
> > + free(child_tests);
> > + return err;
> > + }
> > } else {
> > int subn = num_subtests(t);
> > - /*
> > - * minus 2 to align with normal testcases.
> > - * For subtest we print additional '.x' in number.
> > - * for example:
> > - *
> > - * 35: Test LLVM searching and compiling :
> > - * 35.1: Basic BPF llvm compiling test : Ok
> > - */
> > - int subw = width > 2 ? width - 2 : width;
> > -
> > - if (subn <= 0) {
> > - color_fprintf(stderr, PERF_COLOR_YELLOW,
> > - " Skip (not compiled in)\n");
> > - continue;
> > - }
> > - pr_info("\n");
> >
> > for (subi = 0; subi < subn; subi++) {
> > - int len = strlen(test_description(t, subi));
> > -
> > - if (subw < len)
> > - subw = len;
> > - }
> > + int err;
> >
> > - for (subi = 0; subi < subn; subi++) {
> > if (!perf_test__matches(test_description(t, subi),
> > curr, argc, argv))
> > continue;
> >
> > - pr_info("%3d.%1d: %-*s:", i, subi + 1, subw,
> > - test_description(t, subi));
> > - test_and_print(t, subi);
> > + err = start_test(t, curr, subi, &child_tests[child_test_num++],
> > + width);
> > + if (err)
> > + return err;
> > }
> > }
> > }
> > + for (i = 0; i < child_test_num; i++) {
> > + if (parallel) {
> > + int ret = finish_test(child_tests[i], width);
> > +
> > + if (ret)
> > + return ret;
> > + }
> > + free(child_tests[i]);
> > + }
> > + free(child_tests);
> > return 0;
> > }
> >
> > @@ -449,6 +524,8 @@ int cmd_test(int argc, const char **argv)
> > "be more verbose (show symbol address, etc)"),
> > OPT_BOOLEAN('F', "dont-fork", &dont_fork,
> > "Do not fork for testcase"),
> > + OPT_BOOLEAN('p', "parallel", ¶llel,
> > + "Run the tests altogether in parallel"),
> > OPT_STRING('w', "workload", &workload, "work", "workload to run for testing"),
> > OPT_STRING(0, "dso", &dso_to_test, "dso", "dso to test"),
> > OPT_STRING(0, "objdump", &test_objdump_path, "path",
> > --
> > 2.43.0.rc2.451.g8631bc7472-goog
> >
--
- Arnaldo
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