linux/tools/testing/selftests/rseq/basic_test.c
Mathieu Desnoyers 99babd04b2 selftests/rseq: Implement rseq numa node id field selftest
Test the NUMA node id extension rseq field. Compare it against the value
returned by the getcpu(2) system call while pinned on a specific core.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-7-mathieu.desnoyers@efficios.com
2022-12-27 12:52:11 +01:00

61 lines
1.4 KiB
C

// SPDX-License-Identifier: LGPL-2.1
/*
* Basic test coverage for critical regions and rseq_current_cpu().
*/
#define _GNU_SOURCE
#include <assert.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include "rseq.h"
void test_cpu_pointer(void)
{
cpu_set_t affinity, test_affinity;
int i;
sched_getaffinity(0, sizeof(affinity), &affinity);
CPU_ZERO(&test_affinity);
for (i = 0; i < CPU_SETSIZE; i++) {
if (CPU_ISSET(i, &affinity)) {
int node;
CPU_SET(i, &test_affinity);
sched_setaffinity(0, sizeof(test_affinity),
&test_affinity);
assert(sched_getcpu() == i);
assert(rseq_current_cpu() == i);
assert(rseq_current_cpu_raw() == i);
assert(rseq_cpu_start() == i);
node = rseq_fallback_current_node();
assert(rseq_current_node_id() == node);
CPU_CLR(i, &test_affinity);
}
}
sched_setaffinity(0, sizeof(affinity), &affinity);
}
int main(int argc, char **argv)
{
if (rseq_register_current_thread()) {
fprintf(stderr, "Error: rseq_register_current_thread(...) failed(%d): %s\n",
errno, strerror(errno));
goto init_thread_error;
}
printf("testing current cpu\n");
test_cpu_pointer();
if (rseq_unregister_current_thread()) {
fprintf(stderr, "Error: rseq_unregister_current_thread(...) failed(%d): %s\n",
errno, strerror(errno));
goto init_thread_error;
}
return 0;
init_thread_error:
return -1;
}