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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2023 Meta Platforms, Inc. and affiliates.
* Copyright (c) 2023 David Vernet <dvernet@meta.com>
* Copyright (c) 2023 Tejun Heo <tj@kernel.org>
*/
#include <bpf/bpf.h>
#include <scx/common.h>
#include <sys/wait.h>
#include <unistd.h>
#include "select_cpu_dispatch.bpf.skel.h"
#include "scx_test.h"
#define NUM_CHILDREN 1028
static enum scx_test_status setup(void **ctx)
{
struct select_cpu_dispatch *skel;
skel = select_cpu_dispatch__open_and_load();
SCX_FAIL_IF(!skel, "Failed to open and load skel");
*ctx = skel;
return SCX_TEST_PASS;
}
static enum scx_test_status run(void *ctx)
{
struct select_cpu_dispatch *skel = ctx;
struct bpf_link *link;
pid_t pids[NUM_CHILDREN];
int i, status;
link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dispatch_ops);
SCX_FAIL_IF(!link, "Failed to attach scheduler");
for (i = 0; i < NUM_CHILDREN; i++) {
pids[i] = fork();
if (pids[i] == 0) {
sleep(1);
exit(0);
}
}
for (i = 0; i < NUM_CHILDREN; i++) {
SCX_EQ(waitpid(pids[i], &status, 0), pids[i]);
SCX_EQ(status, 0);
}
bpf_link__destroy(link);
return SCX_TEST_PASS;
}
static void cleanup(void *ctx)
{
struct select_cpu_dispatch *skel = ctx;
select_cpu_dispatch__destroy(skel);
}
struct scx_test select_cpu_dispatch = {
.name = "select_cpu_dispatch",
.description = "Test direct dispatching to built-in DSQs from "
"ops.select_cpu()",
.setup = setup,
.run = run,
.cleanup = cleanup,
};
REGISTER_SCX_TEST(&select_cpu_dispatch)
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