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