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Date: Fri, 16 Feb 2024 14:18:03 -0500
From: Chris Hyser <chris.hyser@...cle.com>
To: "Joel Fernandes (Google)" <joel@...lfernandes.org>,
linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>
Cc: Suleiman Souhlal <suleiman@...gle.com>,
Youssef Esmat <youssefesmat@...gle.com>,
Steven Rostedt
<rostedt@...dmis.org>,
David Vernet <void@...ifault.com>,
Thomas Gleixner <tglx@...utronix.de>,
"Paul E . McKenney"
<paulmck@...nel.org>,
joseph.salisbury@...onical.com,
Dietmar Eggemann <dietmar.eggemann@....com>,
Ben Segall
<bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Valentin Schneider <vschneid@...hat.com>,
Luca Abeni <luca.abeni@...tannapisa.it>,
Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
Vineeth Pillai <vineeth@...byteword.org>,
Shuah Khan <skhan@...uxfoundation.org>, Phil Auld <pauld@...hat.com>,
linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 08/10] selftests/sched: Migrate cs_prctl_test to
kselfttest
On 2/16/24 13:31, Joel Fernandes (Google) wrote:
> This test begs to be a kselftest, is in the kselftest hierarchy and does
> not even use a single kselftest API. Convert it.
>
> It simplifies some of the code and the output also looks much nicer now:
>
> Totals: pass:17 fail:0 xfail:0 xpass:0 skip:0 error:0
>
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
Reviewed-by: Chris Hyser <chris.hyser@...cle.com>
> ---
> tools/testing/selftests/sched/Makefile | 6 +-
> tools/testing/selftests/sched/cs_prctl_test.c | 74 ++++++++++---------
> 2 files changed, 43 insertions(+), 37 deletions(-)
>
> diff --git a/tools/testing/selftests/sched/Makefile b/tools/testing/selftests/sched/Makefile
> index f491d741cb45..90c53bc1337e 100644
> --- a/tools/testing/selftests/sched/Makefile
> +++ b/tools/testing/selftests/sched/Makefile
> @@ -1,9 +1,11 @@
> # SPDX-License-Identifier: GPL-2.0+
> TEST_GEN_PROGS := cs_dlserver_test
> -
> -cs_dlserver_test: cs_dlserver_test.c common.c
> +TEST_GEN_PROGS += cs_prctl_test
>
> CFLAGS += $(KHDR_INCLUDES)
> CFLAGS += -Wall
>
> include ../lib.mk
> +
> +$(OUTPUT)/cs_dlserver_test: cs_dlserver_test.c common.c
> +$(OUTPUT)/cs_prctl_test: cs_prctl_test.c common.c
> diff --git a/tools/testing/selftests/sched/cs_prctl_test.c b/tools/testing/selftests/sched/cs_prctl_test.c
> index 7ba057154343..bb7aee703cdf 100644
> --- a/tools/testing/selftests/sched/cs_prctl_test.c
> +++ b/tools/testing/selftests/sched/cs_prctl_test.c
> @@ -28,10 +28,11 @@
> #include <unistd.h>
> #include <time.h>
> #include <errno.h>
> -#include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
>
> +#include "common.h"
> +
> #if __GLIBC_PREREQ(2, 30) == 0
> #include <sys/syscall.h>
> static pid_t gettid(void)
> @@ -80,7 +81,7 @@ static int _prctl(int option, unsigned long arg2, unsigned long arg3, unsigned l
> int res;
>
> res = prctl(option, arg2, arg3, arg4, arg5);
> - printf("%d = prctl(%d, %ld, %ld, %ld, %lx)\n", res, option, (long)arg2, (long)arg3,
> + ksft_print_msg("%d = prctl(%d, %ld, %ld, %ld, %lx)\n", res, option, (long)arg2, (long)arg3,
> (long)arg4, arg5);
> return res;
> }
> @@ -91,21 +92,20 @@ static int _prctl(int option, unsigned long arg2, unsigned long arg3, unsigned l
> static void __handle_error(char *fn, int ln, char *msg)
> {
> int pidx;
> - printf("(%s:%d) - ", fn, ln);
> + ksft_print_msg("(%s:%d) - ", fn, ln);
> perror(msg);
> if (need_cleanup) {
> for (pidx = 0; pidx < num_processes; ++pidx)
> kill(procs[pidx].cpid, 15);
> need_cleanup = 0;
> }
> - exit(EXIT_FAILURE);
> + ksft_exit_fail();
> }
>
> static void handle_usage(int rc, char *msg)
> {
> - puts(USAGE);
> - puts(msg);
> - putchar('\n');
> + ksft_print_msg("%s\n", USAGE);
> + ksft_print_msg("%s\n\n", msg);
> exit(rc);
> }
>
> @@ -117,7 +117,7 @@ static unsigned long get_cs_cookie(int pid)
> ret = prctl(PR_SCHED_CORE, PR_SCHED_CORE_GET, pid, PIDTYPE_PID,
> (unsigned long)&cookie);
> if (ret) {
> - printf("Not a core sched system\n");
> + ksft_print_msg("Not a core sched system\n");
> return -1UL;
> }
>
> @@ -160,7 +160,7 @@ static int child_func_process(void *arg)
>
> ret = write(ca->pfd[1], &ca->thr_tids, sizeof(int) * ca->num_threads);
> if (ret == -1)
> - printf("write failed on pfd[%d] - error (%s)\n",
> + ksft_print_msg("write failed on pfd[%d] - error (%s)\n",
> ca->pfd[1], strerror(errno));
>
> close(ca->pfd[1]);
> @@ -192,7 +192,7 @@ void create_processes(int num_processes, int num_threads, struct child_args proc
> for (i = 0; i < num_processes; ++i) {
> ret = read(proc[i].pfd[0], &proc[i].thr_tids, sizeof(int) * proc[i].num_threads);
> if (ret == -1)
> - printf("read failed on proc[%d].pfd[0] error (%s)\n",
> + ksft_print_msg("read failed on proc[%d].pfd[0] error (%s)\n",
> i, strerror(errno));
> close(proc[i].pfd[0]);
> }
> @@ -202,30 +202,29 @@ void disp_processes(int num_processes, struct child_args proc[])
> {
> int i, j;
>
> - printf("tid=%d, / tgid=%d / pgid=%d: %lx\n", gettid(), getpid(), getpgid(0),
> + ksft_print_msg("tid=%d, / tgid=%d / pgid=%d: %lx\n", gettid(), getpid(), getpgid(0),
> get_cs_cookie(getpid()));
>
> for (i = 0; i < num_processes; ++i) {
> - printf(" tid=%d, / tgid=%d / pgid=%d: %lx\n", proc[i].cpid, proc[i].cpid,
> + ksft_print_msg(" tid=%d, / tgid=%d / pgid=%d: %lx\n", proc[i].cpid, proc[i].cpid,
> getpgid(proc[i].cpid), get_cs_cookie(proc[i].cpid));
> for (j = 0; j < proc[i].num_threads; ++j) {
> - printf(" tid=%d, / tgid=%d / pgid=%d: %lx\n", proc[i].thr_tids[j],
> + ksft_print_msg(" tid=%d, / tgid=%d / pgid=%d: %lx\n", proc[i].thr_tids[j],
> proc[i].cpid, getpgid(0), get_cs_cookie(proc[i].thr_tids[j]));
> }
> }
> puts("\n");
> }
>
> -static int errors;
> -
> #define validate(v) _validate(__LINE__, v, #v)
> void _validate(int line, int val, char *msg)
> {
> if (!val) {
> - ++errors;
> - printf("(%d) FAILED: %s\n", line, msg);
> + ksft_print_msg("(%d) FAILED: %s\n", line, msg);
> + ksft_inc_fail_cnt();
> } else {
> - printf("(%d) PASSED: %s\n", line, msg);
> + ksft_print_msg("(%d) PASSED: %s\n", line, msg);
> + ksft_inc_pass_cnt();
> }
> }
>
> @@ -254,13 +253,17 @@ int main(int argc, char *argv[])
> keypress = 1;
> break;
> case 'h':
> - printf(USAGE);
> + ksft_print_msg(USAGE);
> exit(EXIT_SUCCESS);
> default:
> handle_usage(20, "unknown option");
> }
> }
>
> + if (!hyperthreading_enabled()) {
> + ksft_exit_skip("This test requires hyperthreading to be enabled\n");
> + }
> +
> if (num_processes < 1 || num_processes > MAX_PROCESSES)
> handle_usage(1, "Bad processes value");
>
> @@ -272,17 +275,22 @@ int main(int argc, char *argv[])
>
> srand(time(NULL));
>
> - /* put into separate process group */
> + /* Put into separate process group */
> if (setpgid(0, 0) != 0)
> handle_error("process group");
>
> - printf("\n## Create a thread/process/process group hiearchy\n");
> + ksft_print_header();
> +
> + /* Increase the count if adding more validate() statements. */
> + ksft_set_plan(17);
> +
> + ksft_print_msg("\n## Create a thread/process/process group hiearchy\n");
> create_processes(num_processes, num_threads, procs);
> need_cleanup = 1;
> disp_processes(num_processes, procs);
> validate(get_cs_cookie(0) == 0);
>
> - printf("\n## Set a cookie on entire process group\n");
> + ksft_print_msg("\n## Set a cookie on entire process group\n");
> if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_CREATE, 0, PIDTYPE_PGID, 0) < 0)
> handle_error("core_sched create failed -- PGID");
> disp_processes(num_processes, procs);
> @@ -296,7 +304,7 @@ int main(int argc, char *argv[])
> validate(get_cs_cookie(0) == get_cs_cookie(pid));
> validate(get_cs_cookie(0) == get_cs_cookie(procs[pidx].thr_tids[0]));
>
> - printf("\n## Set a new cookie on entire process/TGID [%d]\n", pid);
> + ksft_print_msg("\n## Set a new cookie on entire process/TGID [%d]\n", pid);
> if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_CREATE, pid, PIDTYPE_TGID, 0) < 0)
> handle_error("core_sched create failed -- TGID");
> disp_processes(num_processes, procs);
> @@ -305,7 +313,7 @@ int main(int argc, char *argv[])
> validate(get_cs_cookie(pid) != 0);
> validate(get_cs_cookie(pid) == get_cs_cookie(procs[pidx].thr_tids[0]));
>
> - printf("\n## Copy the cookie of current/PGID[%d], to pid [%d] as PIDTYPE_PID\n",
> + ksft_print_msg("\n## Copy the cookie of current/PGID[%d], to pid [%d] as PIDTYPE_PID\n",
> getpid(), pid);
> if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_TO, pid, PIDTYPE_PID, 0) < 0)
> handle_error("core_sched share to itself failed -- PID");
> @@ -315,7 +323,7 @@ int main(int argc, char *argv[])
> validate(get_cs_cookie(pid) != 0);
> validate(get_cs_cookie(pid) != get_cs_cookie(procs[pidx].thr_tids[0]));
>
> - printf("\n## Copy cookie from a thread [%d] to current/PGID [%d] as PIDTYPE_PID\n",
> + ksft_print_msg("\n## Copy cookie from a thread [%d] to current/PGID [%d] as PIDTYPE_PID\n",
> procs[pidx].thr_tids[0], getpid());
> if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_FROM, procs[pidx].thr_tids[0],
> PIDTYPE_PID, 0) < 0)
> @@ -325,7 +333,7 @@ int main(int argc, char *argv[])
> validate(get_cs_cookie(0) == get_cs_cookie(procs[pidx].thr_tids[0]));
> validate(get_cs_cookie(pid) != get_cs_cookie(procs[pidx].thr_tids[0]));
>
> - printf("\n## Copy cookie from current [%d] to current as pidtype PGID\n", getpid());
> + ksft_print_msg("\n## Copy cookie from current [%d] to current as pidtype PGID\n", getpid());
> if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_TO, 0, PIDTYPE_PGID, 0) < 0)
> handle_error("core_sched share to self failed -- PGID");
> disp_processes(num_processes, procs);
> @@ -340,20 +348,16 @@ int main(int argc, char *argv[])
> validate(_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_TO, 0, PIDTYPE_PGID, 1) < 0
> && errno == EINVAL);
>
> - if (errors) {
> - printf("TESTS FAILED. errors: %d\n", errors);
> - res = 10;
> - } else {
> - printf("SUCCESS !!!\n");
> - }
> -
> - if (keypress)
> + if (keypress) {
> + ksft_print_msg("Waiting for keypress to exit\n");
> getchar();
> - else
> + } else {
> sleep(delay);
> + }
>
> for (pidx = 0; pidx < num_processes; ++pidx)
> kill(procs[pidx].cpid, 15);
>
> + ksft_finished();
> return res;
> }
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