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281 lines
8.5 KiB
C
281 lines
8.5 KiB
C
/* Generic test for CPU affinity functions, multi-threaded variant.
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Copyright (C) 2015-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* Before including this file, a test has to declare the helper
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getaffinity and setaffinity functions described in
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tst-skeleton-affinity.c, which is included below. */
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#include <errno.h>
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#include <pthread.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <sys/time.h>
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struct conf;
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static bool early_test (struct conf *);
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/* Arbitrary run time for each pass. */
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#define PASS_TIMEOUT 2
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/* There are two passes (one with sched_yield, one without), and we
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double the timeout to be on the safe side. */
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#define TIMEOUT (2 * PASS_TIMEOUT * 2)
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#include "tst-skeleton-affinity.c"
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/* 0 if still running, 1 of stopping requested. */
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static int still_running;
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/* 0 if no scheduling failures, 1 if failures are encountered. */
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static int failed;
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static void *
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thread_burn_one_cpu (void *closure)
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{
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int cpu = (uintptr_t) closure;
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while (__atomic_load_n (&still_running, __ATOMIC_RELAXED) == 0)
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{
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int current = sched_getcpu ();
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if (sched_getcpu () != cpu)
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{
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printf ("error: Pinned thread %d ran on impossible cpu %d\n",
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cpu, current);
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__atomic_store_n (&failed, 1, __ATOMIC_RELAXED);
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/* Terminate early. */
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__atomic_store_n (&still_running, 1, __ATOMIC_RELAXED);
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}
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}
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return NULL;
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}
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struct burn_thread
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{
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pthread_t self;
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struct conf *conf;
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cpu_set_t *initial_set;
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cpu_set_t *seen_set;
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int thread;
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};
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static void *
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thread_burn_any_cpu (void *closure)
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{
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struct burn_thread *param = closure;
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/* Schedule this thread around a bit to see if it lands on another
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CPU. Run this for 2 seconds, once with sched_yield, once
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without. */
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for (int pass = 1; pass <= 2; ++pass)
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{
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time_t start = time (NULL);
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while (time (NULL) - start <= PASS_TIMEOUT)
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{
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int cpu = sched_getcpu ();
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if (cpu > param->conf->last_cpu
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|| !CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (param->conf->set_size),
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param->initial_set))
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{
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printf ("error: Unpinned thread %d ran on impossible CPU %d\n",
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param->thread, cpu);
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__atomic_store_n (&failed, 1, __ATOMIC_RELAXED);
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return NULL;
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}
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CPU_SET_S (cpu, CPU_ALLOC_SIZE (param->conf->set_size),
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param->seen_set);
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if (pass == 1)
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sched_yield ();
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}
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}
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return NULL;
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}
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static void
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stop_and_join_threads (struct conf *conf, cpu_set_t *set,
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pthread_t *pinned_first, pthread_t *pinned_last,
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struct burn_thread *other_first,
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struct burn_thread *other_last)
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{
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__atomic_store_n (&still_running, 1, __ATOMIC_RELAXED);
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for (pthread_t *p = pinned_first; p < pinned_last; ++p)
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{
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int cpu = p - pinned_first;
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if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), set))
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continue;
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int ret = pthread_join (*p, NULL);
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if (ret != 0)
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{
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printf ("error: Failed to join thread %d: %s\n", cpu, strerror (ret));
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fflush (stdout);
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/* Cannot shut down cleanly with threads still running. */
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abort ();
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}
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}
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for (struct burn_thread *p = other_first; p < other_last; ++p)
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{
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int cpu = p - other_first;
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if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), set))
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continue;
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int ret = pthread_join (p->self, NULL);
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if (ret != 0)
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{
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printf ("error: Failed to join thread %d: %s\n", cpu, strerror (ret));
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fflush (stdout);
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/* Cannot shut down cleanly with threads still running. */
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abort ();
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}
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}
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}
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/* Tries to check that the initial set of CPUs is complete and that
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the main thread will not run on any other threads. */
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static bool
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early_test (struct conf *conf)
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{
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pthread_t *pinned_threads
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= calloc (conf->last_cpu + 1, sizeof (*pinned_threads));
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struct burn_thread *other_threads
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= calloc (conf->last_cpu + 1, sizeof (*other_threads));
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cpu_set_t *initial_set = CPU_ALLOC (conf->set_size);
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cpu_set_t *scratch_set = CPU_ALLOC (conf->set_size);
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if (pinned_threads == NULL || other_threads == NULL
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|| initial_set == NULL || scratch_set == NULL)
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{
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puts ("error: Memory allocation failure");
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return false;
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}
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if (getaffinity (CPU_ALLOC_SIZE (conf->set_size), initial_set) < 0)
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{
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printf ("error: pthread_getaffinity_np failed: %m\n");
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return false;
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}
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for (int cpu = 0; cpu <= conf->last_cpu; ++cpu)
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{
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if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), initial_set))
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continue;
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other_threads[cpu].conf = conf;
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other_threads[cpu].initial_set = initial_set;
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other_threads[cpu].thread = cpu;
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other_threads[cpu].seen_set = CPU_ALLOC (conf->set_size);
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if (other_threads[cpu].seen_set == NULL)
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{
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puts ("error: Memory allocation failure");
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return false;
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}
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CPU_ZERO_S (CPU_ALLOC_SIZE (conf->set_size),
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other_threads[cpu].seen_set);
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}
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pthread_attr_t attr;
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int ret = pthread_attr_init (&attr);
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if (ret != 0)
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{
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printf ("error: pthread_attr_init failed: %s\n", strerror (ret));
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return false;
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}
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/* Spawn a thread pinned to each available CPU. */
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for (int cpu = 0; cpu <= conf->last_cpu; ++cpu)
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{
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if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), initial_set))
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continue;
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CPU_ZERO_S (CPU_ALLOC_SIZE (conf->set_size), scratch_set);
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CPU_SET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), scratch_set);
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ret = pthread_attr_setaffinity_np
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(&attr, CPU_ALLOC_SIZE (conf->set_size), scratch_set);
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if (ret != 0)
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{
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printf ("error: pthread_attr_setaffinity_np for CPU %d failed: %s\n",
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cpu, strerror (ret));
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stop_and_join_threads (conf, initial_set,
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pinned_threads, pinned_threads + cpu,
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NULL, NULL);
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return false;
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}
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ret = pthread_create (pinned_threads + cpu, &attr,
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thread_burn_one_cpu, (void *) (uintptr_t) cpu);
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if (ret != 0)
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{
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printf ("error: pthread_create for CPU %d failed: %s\n",
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cpu, strerror (ret));
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stop_and_join_threads (conf, initial_set,
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pinned_threads, pinned_threads + cpu,
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NULL, NULL);
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return false;
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}
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}
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/* Spawn another set of threads running on all CPUs. */
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for (int cpu = 0; cpu <= conf->last_cpu; ++cpu)
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{
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if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), initial_set))
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continue;
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ret = pthread_create (&other_threads[cpu].self, NULL,
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thread_burn_any_cpu, other_threads + cpu);
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if (ret != 0)
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{
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printf ("error: pthread_create for thread %d failed: %s\n",
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cpu, strerror (ret));
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stop_and_join_threads (conf, initial_set,
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pinned_threads,
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pinned_threads + conf->last_cpu + 1,
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other_threads, other_threads + cpu);
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return false;
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}
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}
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/* Main thread. */
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struct burn_thread main_thread;
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main_thread.conf = conf;
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main_thread.initial_set = initial_set;
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main_thread.seen_set = scratch_set;
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main_thread.thread = -1;
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CPU_ZERO_S (CPU_ALLOC_SIZE (conf->set_size), main_thread.seen_set);
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thread_burn_any_cpu (&main_thread);
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stop_and_join_threads (conf, initial_set,
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pinned_threads,
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pinned_threads + conf->last_cpu + 1,
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other_threads, other_threads + conf->last_cpu + 1);
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printf ("info: Main thread ran on %d CPU(s) of %d available CPU(s)\n",
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CPU_COUNT_S (CPU_ALLOC_SIZE (conf->set_size), scratch_set),
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CPU_COUNT_S (CPU_ALLOC_SIZE (conf->set_size), initial_set));
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CPU_ZERO_S (CPU_ALLOC_SIZE (conf->set_size), scratch_set);
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for (int cpu = 0; cpu <= conf->last_cpu; ++cpu)
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{
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if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), initial_set))
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continue;
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CPU_OR_S (CPU_ALLOC_SIZE (conf->set_size),
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scratch_set, scratch_set, other_threads[cpu].seen_set);
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CPU_FREE (other_threads[cpu].seen_set);
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}
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printf ("info: Other threads ran on %d CPU(s)\n",
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CPU_COUNT_S (CPU_ALLOC_SIZE (conf->set_size), scratch_set));;
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pthread_attr_destroy (&attr);
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CPU_FREE (scratch_set);
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CPU_FREE (initial_set);
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free (pinned_threads);
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free (other_threads);
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return failed == 0;
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}
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