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/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2025 Colin Ian King.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#include "core-builtin.h"
#include "core-killpid.h"
#include "core-out-of-memory.h"
#include "core-resources.h"
#define MIN_MEM_FREE (16 * MB)
#define MAX_PIDS (2048)
#define MAX_LOOPS (2048)
static const stress_help_t help[] = {
{ NULL, "resources N", "start N workers consuming system resources" },
{ NULL, "resources-mlock", "attempt to mlock pages into memory" },
{ NULL, "resources-ops N", "stop after N resource bogo operations" },
{ NULL, NULL, NULL }
};
/*
* stress_resources()
* stress by forking and exiting
*/
static int stress_resources(stress_args_t *args)
{
const size_t pipe_size = stress_probe_max_pipe_size();
size_t min_mem_free, shmall, freemem, totalmem, freeswap, totalswap;
size_t num_pids = MAX_PIDS;
stress_resources_t *resources;
const size_t num_resources = MAX_LOOPS;
stress_pid_t *s_pids;
bool resources_mlock = false;
if (!stress_get_setting("resources-mlock", &resources_mlock)) {
if (g_opt_flags & OPT_FLAGS_AGGRESSIVE)
resources_mlock = true;
}
stress_get_memlimits(&shmall, &freemem, &totalmem, &freeswap, &totalswap);
min_mem_free = (freemem / 100) * 2;
if (min_mem_free < MIN_MEM_FREE)
min_mem_free = MIN_MEM_FREE;
#if defined(MCL_FUTURE)
if (resources_mlock)
(void)shim_mlockall(MCL_FUTURE);
#else
UNEXPECTED
#endif
s_pids = stress_sync_s_pids_mmap(num_pids);
if (s_pids == MAP_FAILED) {
pr_inf_skip("%s: failed to mmap %zu PIDs%s, skipping stressor\n",
args->name, num_pids, stress_get_memfree_str());
return EXIT_NO_RESOURCE;
}
resources = (stress_resources_t *)malloc(num_resources * sizeof(*resources));
if (!resources) {
pr_inf_skip("%s: cannot allocate %zu resource structures%s, skipping stressor\n",
args->name, num_resources, stress_get_memfree_str());
(void)stress_sync_s_pids_munmap(s_pids, num_pids);
return EXIT_NO_RESOURCE;
}
stress_set_proc_state(args->name, STRESS_STATE_SYNC_WAIT);
stress_sync_start_wait(args);
stress_set_proc_state(args->name, STRESS_STATE_RUN);
do {
unsigned int i;
(void)shim_memset(s_pids, 0, sizeof(*s_pids));
for (i = 0; i < num_pids; i++) {
pid_t pid;
stress_get_memlimits(&shmall, &freemem, &totalmem, &freeswap, &totalswap);
if ((freemem > 0) && (freemem < min_mem_free))
break;
pid = fork();
if (pid == 0) {
size_t n;
stress_set_oom_adjustment(args, true);
VOID_RET(int, stress_drop_capabilities(args->name));
(void)sched_settings_apply(true);
n = stress_resources_allocate(args, resources, num_resources, pipe_size, min_mem_free, true);
stress_resources_access(args, resources, n);
stress_resources_free(args, resources, n);
_exit(0);
}
s_pids[i].pid = pid;
if (UNLIKELY(!stress_continue(args)))
break;
stress_bogo_inc(args);
}
stress_kill_and_wait_many(args, s_pids, num_pids, SIGALRM, true);
} while (stress_continue(args));
stress_set_proc_state(args->name, STRESS_STATE_DEINIT);
free(resources);
(void)stress_sync_s_pids_munmap(s_pids, num_pids);
return EXIT_SUCCESS;
}
static const stress_opt_t opts[] = {
{ OPT_resources_mlock, "resources-mlock", TYPE_ID_BOOL, 0, 1, NULL },
END_OPT,
};
const stressor_info_t stress_resources_info = {
.stressor = stress_resources,
.classifier = CLASS_MEMORY | CLASS_OS,
.opts = opts,
.help = help
};
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