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