Quelle  select_cpu_dfl.c   Sprache: C

/* 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_dfl.bpf.skel.h"
#include "scx_test.h"

#define NUM_CHILDREN 1028

static enum scx_test_status setup(void **ctx)
{
 struct select_cpu_dfl *skel;

 skel = select_cpu_dfl__open();
 SCX_FAIL_IF(!skel, "Failed to open");
 SCX_ENUM_INIT(skel);
 SCX_FAIL_IF(select_cpu_dfl__load(skel), "Failed to load skel");

 *ctx = skel;

 return SCX_TEST_PASS;
}

static enum scx_test_status run(void *ctx)
{
 struct select_cpu_dfl *skel = ctx;
 struct bpf_link *link;
 pid_t pids[NUM_CHILDREN];
 int i, status;

 link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dfl_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);
 }

 SCX_ASSERT(!skel->bss->saw_local);

 bpf_link__destroy(link);

 return SCX_TEST_PASS;
}

static void cleanup(void *ctx)
{
 struct select_cpu_dfl *skel = ctx;

 select_cpu_dfl__destroy(skel);
}

struct scx_test select_cpu_dfl = {
 .name = "select_cpu_dfl",
 .description = "Verify the default ops.select_cpu() dispatches tasks "
         "when idles cores are found, and skips ops.enqueue()",
 .setup = setup,
 .run = run,
 .cleanup = cleanup,
};
REGISTER_SCX_TEST(&select_cpu_dfl)