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/*
* Copyright (C) 2013-2019 Canonical, Ltd.
*
* 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.
*
* This code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
typedef struct zombie {
struct zombie *next;
pid_t pid;
} zombie_t;
typedef struct {
zombie_t *head; /* Head of zombie procs list */
zombie_t *tail; /* Tail of zombie procs list */
zombie_t *free; /* List of free'd zombies */
uint64_t length; /* Length of list */
} zombie_list_t;
static zombie_list_t zombies;
/*
* stress_zombie_new()
* allocate a new zombie, add to end of list
*/
static zombie_t *stress_zombie_new(void)
{
zombie_t *new;
if (zombies.free) {
/* Pop an old one off the free list */
new = zombies.free;
zombies.free = new->next;
new->next = NULL;
} else {
new = calloc(1, sizeof(*new));
if (!new)
return NULL;
}
if (zombies.head)
zombies.tail->next = new;
else
zombies.head = new;
zombies.tail = new;
zombies.length++;
return new;
}
/*
* stress_zombie_head_remove
* reap a zombie and remove a zombie from head of list, put it onto
* the free zombie list
*/
static void stress_zombie_head_remove(void)
{
if (zombies.head) {
int status;
(void)waitpid(zombies.head->pid, &status, 0);
zombie_t *head = zombies.head;
if (zombies.tail == zombies.head) {
zombies.tail = NULL;
zombies.head = NULL;
} else {
zombies.head = head->next;
}
/* Shove it on the free list */
head->next = zombies.free;
zombies.free = head;
zombies.length--;
}
}
/*
* stress_zombie_free()
* free the zombies off the zombie free lists
*/
static void stress_zombie_free(void)
{
while (zombies.head) {
zombie_t *next = zombies.head->next;
free(zombies.head);
zombies.head = next;
}
while (zombies.free) {
zombie_t *next = zombies.free->next;
free(zombies.free);
zombies.free = next;
}
}
/*
* stress_set_zombie_max()
* set maximum number of zombies allowed
*/
int stress_set_zombie_max(const char *opt)
{
uint64_t zombie_max;
zombie_max = get_uint64(opt);
check_range("zombie-max", zombie_max,
MIN_ZOMBIES, MAX_ZOMBIES);
return set_setting("zombie-max", TYPE_ID_INT64, &zombie_max);
}
/*
* stress_zombie()
* stress by zombieing and exiting
*/
static int stress_zombie(const args_t *args)
{
uint64_t max_zombies = 0;
uint64_t zombie_max = DEFAULT_ZOMBIES;
if (!get_setting("zombie-max", &zombie_max)) {
if (g_opt_flags & OPT_FLAGS_MAXIMIZE)
zombie_max = MAX_ZOMBIES;
if (g_opt_flags & OPT_FLAGS_MINIMIZE)
zombie_max = MIN_ZOMBIES;
}
do {
if (zombies.length < zombie_max) {
zombie_t *zombie;
zombie = stress_zombie_new();
if (!zombie)
break;
zombie->pid = fork();
if (zombie->pid == 0) {
(void)setpgid(0, g_pgrp);
stress_parent_died_alarm();
stress_zombie_free();
_exit(0);
}
if (zombie->pid == -1) {
/* Reached max forks? .. then reap */
stress_zombie_head_remove();
continue;
}
(void)setpgid(zombie->pid, g_pgrp);
if (max_zombies < zombies.length)
max_zombies = zombies.length;
inc_counter(args);
} else {
stress_zombie_head_remove();
}
} while (keep_stressing());
pr_inf("%s: created a maximum of %" PRIu64 " zombies\n",
args->name, max_zombies);
/* And reap */
while (zombies.head) {
stress_zombie_head_remove();
}
/* And free */
stress_zombie_free();
return EXIT_SUCCESS;
}
stressor_info_t stress_zombie_info = {
.stressor = stress_zombie,
.class = CLASS_SCHEDULER | CLASS_OS
};
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