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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 <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>
#include "select_cpu_dfl.bpf.skel.h"
#include "scx_test.h"
#define NUM_CHILDREN 1028
struct select_cpu_dfl_ctx {
struct select_cpu_dfl *skel;
struct bpf_link *link;
};
static enum scx_test_status setup(void **ctx)
{
struct select_cpu_dfl_ctx *tctx;
tctx = malloc(sizeof(*tctx));
SCX_FAIL_IF(!tctx, "Failed to allocate test context");
tctx->link = NULL;
tctx->skel = select_cpu_dfl__open();
if (!tctx->skel) {
free(tctx);
SCX_FAIL("Failed to open");
}
SCX_ENUM_INIT(tctx->skel);
if (select_cpu_dfl__load(tctx->skel)) {
select_cpu_dfl__destroy(tctx->skel);
free(tctx);
SCX_FAIL("Failed to load skel");
}
*ctx = tctx;
return SCX_TEST_PASS;
}
static enum scx_test_status run(void *ctx)
{
struct select_cpu_dfl_ctx *tctx = ctx;
pid_t pids[NUM_CHILDREN];
int i, status, nforked = 0;
tctx->link = bpf_map__attach_struct_ops(tctx->skel->maps.select_cpu_dfl_ops);
SCX_FAIL_IF(!tctx->link, "Failed to attach scheduler");
for (i = 0; i < NUM_CHILDREN; i++) {
pids[i] = fork();
if (pids[i] == 0) {
sleep(1);
exit(0);
}
if (pids[i] > 0)
nforked++;
}
for (i = 0; i < NUM_CHILDREN; i++) {
if (pids[i] <= 0)
continue;
SCX_EQ(waitpid(pids[i], &status, 0), pids[i]);
SCX_EQ(status, 0);
}
SCX_GT(nforked, 0);
SCX_ASSERT(!tctx->skel->bss->saw_local);
return SCX_TEST_PASS;
}
static void cleanup(void *ctx)
{
struct select_cpu_dfl_ctx *tctx = ctx;
if (tctx->link)
bpf_link__destroy(tctx->link);
select_cpu_dfl__destroy(tctx->skel);
free(tctx);
}
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)
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