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selftests/bpf: Reset process and thread affinity after each test/sub-test 

Some tests and sub-tests are setting "custom" thread/process affinity and
don't reset it back. Instead of requiring each test to undo all this, ensure
that thread affinity is restored by test_progs test runner itself.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200314013932.4035712-3-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-03-13 18:39:32 -07:00 committed by Daniel Borkmann
parent fc32490bff
commit fd27b1835e
2 changed files with 42 additions and 1 deletions
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42
tools/testing/selftests/bpf/test_progs.c
View File

@ -1,12 +1,15 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Facebook
*/
#define _GNU_SOURCE
#include "test_progs.h"
#include "cgroup_helpers.h"
#include "bpf_rlimit.h"
#include <argp.h>
#include <string.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <string.h>
#include <execinfo.h> /* backtrace */
/* defined in test_progs.h */
@ -90,6 +93,34 @@ static void skip_account(void)
}
}
static void stdio_restore(void);
/* A bunch of tests set custom affinity per-thread and/or per-process. Reset
* it after each test/sub-test.
*/
static void reset_affinity() {
cpu_set_t cpuset;
int i, err;
CPU_ZERO(&cpuset);
for (i = 0; i < env.nr_cpus; i++)
CPU_SET(i, &cpuset);
err = sched_setaffinity(0, sizeof(cpuset), &cpuset);
if (err < 0) {
stdio_restore();
fprintf(stderr, "Failed to reset process affinity: %d!\n", err);
exit(-1);
}
err = pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset);
if (err < 0) {
stdio_restore();
fprintf(stderr, "Failed to reset thread affinity: %d!\n", err);
exit(-1);
}
}
void test__end_subtest()
{
struct prog_test_def *test = env.test;
@ -107,6 +138,8 @@ void test__end_subtest()
test->test_num, test->subtest_num,
test->subtest_name, sub_error_cnt ? "FAIL" : "OK");
reset_affinity();
free(test->subtest_name);
test->subtest_name = NULL;
}
@ -679,6 +712,12 @@ int main(int argc, char **argv)
srand(time(NULL));
env.jit_enabled = is_jit_enabled();
env.nr_cpus = libbpf_num_possible_cpus();
if (env.nr_cpus < 0) {
fprintf(stderr, "Failed to get number of CPUs: %d!\n",
env.nr_cpus);
return -1;
}
stdio_hijack();
for (i = 0; i < prog_test_cnt; i++) {
@ -709,6 +748,7 @@ int main(int argc, char **argv)
test->test_num, test->test_name,
test->error_cnt ? "FAIL" : "OK");
reset_affinity();
if (test->need_cgroup_cleanup)
cleanup_cgroup_environment();
}

1
tools/testing/selftests/bpf/test_progs.h
View File

@ -71,6 +71,7 @@ struct test_env {
FILE *stderr;
char *log_buf;
size_t log_cnt;
int nr_cpus;
int succ_cnt; /* successful tests */
int sub_succ_cnt; /* successful sub-tests */