kselftest: Add test for core sched prctl interface
Provides a selftest and examples of using the interface. [peterz: updated to not use sched_debug] Signed-off-by: Chris Hyser <chris.hyser@oracle.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Don Hiatt <dhiatt@digitalocean.com> Tested-by: Hongyu Ning <hongyu.ning@linux.intel.com> Tested-by: Vincent Guittot <vincent.guittot@linaro.org> Link: https://lkml.kernel.org/r/20210422123309.100860030@infradead.org
This commit is contained in:
Chris Hyser
Peter Zijlstra
Родитель
7ac592aa35
Коммит
9f26990074
|
|
@ -0,0 +1 @@
|
|||
cs_prctl_test
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
# SPDX-License-Identifier: GPL-2.0+
|
||||
|
||||
ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
|
||||
CLANG_FLAGS += -no-integrated-as
|
||||
endif
|
||||
|
||||
CFLAGS += -O2 -Wall -g -I./ -I../../../../usr/include/ -Wl,-rpath=./ \
|
||||
$(CLANG_FLAGS)
|
||||
LDLIBS += -lpthread
|
||||
|
||||
TEST_GEN_FILES := cs_prctl_test
|
||||
TEST_PROGS := cs_prctl_test
|
||||
|
||||
include ../lib.mk
|
||||
|
|
@ -0,0 +1 @@
|
|||
CONFIG_SCHED_DEBUG=y
|
||||
|
|
@ -0,0 +1,338 @@
|
|||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/*
|
||||
* Use the core scheduling prctl() to test core scheduling cookies control.
|
||||
*
|
||||
* Copyright (c) 2021 Oracle and/or its affiliates.
|
||||
* Author: Chris Hyser <chris.hyser@oracle.com>
|
||||
*
|
||||
*
|
||||
* This library is free software; you can redistribute it and/or modify it
|
||||
* under the terms of version 2.1 of the GNU Lesser General Public License as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
|
||||
* for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public License
|
||||
* along with this library; if not, see <http://www.gnu.org/licenses>.
|
||||
*/
|
||||
|
||||
#define _GNU_SOURCE
|
||||
#include <sys/eventfd.h>
|
||||
#include <sys/wait.h>
|
||||
#include <sys/types.h>
|
||||
#include <sched.h>
|
||||
#include <sys/prctl.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/wait.h>
|
||||
#include <unistd.h>
|
||||
#include <time.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
#if __GLIBC_PREREQ(2, 30) == 0
|
||||
#include <sys/syscall.h>
|
||||
static pid_t gettid(void)
|
||||
{
|
||||
return syscall(SYS_gettid);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef PR_SCHED_CORE
|
||||
#define PR_SCHED_CORE 62
|
||||
# define PR_SCHED_CORE_GET 0
|
||||
# define PR_SCHED_CORE_CREATE 1 /* create unique core_sched cookie */
|
||||
# define PR_SCHED_CORE_SHARE_TO 2 /* push core_sched cookie to pid */
|
||||
# define PR_SCHED_CORE_SHARE_FROM 3 /* pull core_sched cookie to pid */
|
||||
# define PR_SCHED_CORE_MAX 4
|
||||
#endif
|
||||
|
||||
#define MAX_PROCESSES 128
|
||||
#define MAX_THREADS 128
|
||||
|
||||
static const char USAGE[] = "cs_prctl_test [options]\n"
|
||||
" options:\n"
|
||||
" -P : number of processes to create.\n"
|
||||
" -T : number of threads per process to create.\n"
|
||||
" -d : delay time to keep tasks alive.\n"
|
||||
" -k : keep tasks alive until keypress.\n";
|
||||
|
||||
enum pid_type {PIDTYPE_PID = 0, PIDTYPE_TGID, PIDTYPE_PGID};
|
||||
|
||||
const int THREAD_CLONE_FLAGS = CLONE_THREAD | CLONE_SIGHAND | CLONE_FS | CLONE_VM | CLONE_FILES;
|
||||
|
||||
static int _prctl(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4,
|
||||
unsigned long arg5)
|
||||
{
|
||||
int res;
|
||||
|
||||
res = prctl(option, arg2, arg3, arg4, arg5);
|
||||
printf("%d = prctl(%d, %ld, %ld, %ld, %lx)\n", res, option, (long)arg2, (long)arg3,
|
||||
(long)arg4, arg5);
|
||||
return res;
|
||||
}
|
||||
|
||||
#define STACK_SIZE (1024 * 1024)
|
||||
|
||||
#define handle_error(msg) __handle_error(__FILE__, __LINE__, msg)
|
||||
static void __handle_error(char *fn, int ln, char *msg)
|
||||
{
|
||||
printf("(%s:%d) - ", fn, ln);
|
||||
perror(msg);
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
static void handle_usage(int rc, char *msg)
|
||||
{
|
||||
puts(USAGE);
|
||||
puts(msg);
|
||||
putchar('\n');
|
||||
exit(rc);
|
||||
}
|
||||
|
||||
static unsigned long get_cs_cookie(int pid)
|
||||
{
|
||||
unsigned long long cookie;
|
||||
int ret;
|
||||
|
||||
ret = prctl(PR_SCHED_CORE, PR_SCHED_CORE_GET, pid, PIDTYPE_PID,
|
||||
(unsigned long)&cookie);
|
||||
if (ret) {
|
||||
printf("Not a core sched system\n");
|
||||
return -1UL;
|
||||
}
|
||||
|
||||
return cookie;
|
||||
}
|
||||
|
||||
struct child_args {
|
||||
int num_threads;
|
||||
int pfd[2];
|
||||
int cpid;
|
||||
int thr_tids[MAX_THREADS];
|
||||
};
|
||||
|
||||
static int child_func_thread(void __attribute__((unused))*arg)
|
||||
{
|
||||
while (1)
|
||||
usleep(20000);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void create_threads(int num_threads, int thr_tids[])
|
||||
{
|
||||
void *child_stack;
|
||||
pid_t tid;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < num_threads; ++i) {
|
||||
child_stack = malloc(STACK_SIZE);
|
||||
if (!child_stack)
|
||||
handle_error("child stack allocate");
|
||||
|
||||
tid = clone(child_func_thread, child_stack + STACK_SIZE, THREAD_CLONE_FLAGS, NULL);
|
||||
if (tid == -1)
|
||||
handle_error("clone thread");
|
||||
thr_tids[i] = tid;
|
||||
}
|
||||
}
|
||||
|
||||
static int child_func_process(void *arg)
|
||||
{
|
||||
struct child_args *ca = (struct child_args *)arg;
|
||||
|
||||
close(ca->pfd[0]);
|
||||
|
||||
create_threads(ca->num_threads, ca->thr_tids);
|
||||
|
||||
write(ca->pfd[1], &ca->thr_tids, sizeof(int) * ca->num_threads);
|
||||
close(ca->pfd[1]);
|
||||
|
||||
while (1)
|
||||
usleep(20000);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static unsigned char child_func_process_stack[STACK_SIZE];
|
||||
|
||||
void create_processes(int num_processes, int num_threads, struct child_args proc[])
|
||||
{
|
||||
pid_t cpid;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < num_processes; ++i) {
|
||||
proc[i].num_threads = num_threads;
|
||||
|
||||
if (pipe(proc[i].pfd) == -1)
|
||||
handle_error("pipe() failed");
|
||||
|
||||
cpid = clone(child_func_process, child_func_process_stack + STACK_SIZE,
|
||||
SIGCHLD, &proc[i]);
|
||||
proc[i].cpid = cpid;
|
||||
close(proc[i].pfd[1]);
|
||||
}
|
||||
|
||||
for (i = 0; i < num_processes; ++i) {
|
||||
read(proc[i].pfd[0], &proc[i].thr_tids, sizeof(int) * proc[i].num_threads);
|
||||
close(proc[i].pfd[0]);
|
||||
}
|
||||
}
|
||||
|
||||
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),
|
||||
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,
|
||||
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],
|
||||
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);
|
||||
} else {
|
||||
printf("(%d) PASSED: %s\n", line, msg);
|
||||
}
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
struct child_args procs[MAX_PROCESSES];
|
||||
|
||||
int keypress = 0;
|
||||
int num_processes = 2;
|
||||
int num_threads = 3;
|
||||
int delay = 0;
|
||||
int res = 0;
|
||||
int pidx;
|
||||
int pid;
|
||||
int opt;
|
||||
|
||||
while ((opt = getopt(argc, argv, ":hkT:P:d:")) != -1) {
|
||||
switch (opt) {
|
||||
case 'P':
|
||||
num_processes = (int)strtol(optarg, NULL, 10);
|
||||
break;
|
||||
case 'T':
|
||||
num_threads = (int)strtoul(optarg, NULL, 10);
|
||||
break;
|
||||
case 'd':
|
||||
delay = (int)strtol(optarg, NULL, 10);
|
||||
break;
|
||||
case 'k':
|
||||
keypress = 1;
|
||||
break;
|
||||
case 'h':
|
||||
printf(USAGE);
|
||||
exit(EXIT_SUCCESS);
|
||||
default:
|
||||
handle_usage(20, "unknown option");
|
||||
}
|
||||
}
|
||||
|
||||
if (num_processes < 1 || num_processes > MAX_PROCESSES)
|
||||
handle_usage(1, "Bad processes value");
|
||||
|
||||
if (num_threads < 1 || num_threads > MAX_THREADS)
|
||||
handle_usage(2, "Bad thread value");
|
||||
|
||||
if (keypress)
|
||||
delay = -1;
|
||||
|
||||
srand(time(NULL));
|
||||
|
||||
/* put into separate process group */
|
||||
if (setpgid(0, 0) != 0)
|
||||
handle_error("process group");
|
||||
|
||||
printf("\n## Create a thread/process/process group hiearchy\n");
|
||||
create_processes(num_processes, num_threads, procs);
|
||||
disp_processes(num_processes, procs);
|
||||
validate(get_cs_cookie(0) == 0);
|
||||
|
||||
printf("\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);
|
||||
|
||||
validate(get_cs_cookie(0) != 0);
|
||||
|
||||
/* get a random process pid */
|
||||
pidx = rand() % num_processes;
|
||||
pid = procs[pidx].cpid;
|
||||
|
||||
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);
|
||||
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);
|
||||
|
||||
validate(get_cs_cookie(0) != get_cs_cookie(pid));
|
||||
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",
|
||||
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");
|
||||
disp_processes(num_processes, procs);
|
||||
|
||||
validate(get_cs_cookie(0) == get_cs_cookie(pid));
|
||||
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",
|
||||
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)
|
||||
handle_error("core_sched share from thread failed -- PID");
|
||||
disp_processes(num_processes, procs);
|
||||
|
||||
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());
|
||||
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);
|
||||
|
||||
validate(get_cs_cookie(0) == get_cs_cookie(pid));
|
||||
validate(get_cs_cookie(pid) != 0);
|
||||
validate(get_cs_cookie(pid) == get_cs_cookie(procs[pidx].thr_tids[0]));
|
||||
|
||||
if (errors) {
|
||||
printf("TESTS FAILED. errors: %d\n", errors);
|
||||
res = 10;
|
||||
} else {
|
||||
printf("SUCCESS !!!\n");
|
||||
}
|
||||
|
||||
if (keypress)
|
||||
getchar();
|
||||
else
|
||||
sleep(delay);
|
||||
|
||||
for (pidx = 0; pidx < num_processes; ++pidx)
|
||||
kill(procs[pidx].cpid, 15);
|
||||
|
||||
return res;
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче