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/*
* Copyright (C) 2012-2017 Red Hat, Inc.
*
* 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.
*
* Description:
*
* The case is designed to test min_free_kbytes tunable.
*
* The tune is used to control free memory, and system always
* reserve min_free_kbytes memory at least.
*
* Since the tune is not too large or too little, which will
* lead to the system hang, so I choose two cases, and test them
* on all overcommit_memory policy, at the same time, compare
* the current free memory with the tunable value repeatedly.
*
* a) default min_free_kbytes with all overcommit memory policy
* b) 2x default value with all overcommit memory policy
* c) 5% of MemFree or %2 MemTotal with all overcommit memory policy
*/
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include "lapi/abisize.h"
#include "mem.h"
#define MAP_SIZE (1UL<<20)
volatile int end;
static long default_tune = -1;
static long orig_overcommit = -1;
static unsigned long total_mem;
static void test_tune(unsigned long overcommit_policy);
static int eatup_mem(unsigned long overcommit_policy);
static void check_monitor(void);
static void sighandler(int signo LTP_ATTRIBUTE_UNUSED);
static void min_free_kbytes_test(void)
{
int pid, status;
struct sigaction sa;
sa.sa_handler = sighandler;
if (sigemptyset(&sa.sa_mask) < 0)
tst_brk(TBROK | TERRNO, "sigemptyset");
sa.sa_flags = 0;
if (sigaction(SIGUSR1, &sa, NULL) < 0)
tst_brk(TBROK | TERRNO, "sigaction");
pid = SAFE_FORK();
if (pid == 0) {
/* startup the check monitor */
check_monitor();
exit(0);
}
test_tune(2);
test_tune(0);
test_tune(1);
SAFE_KILL(pid, SIGUSR1);
SAFE_WAITPID(pid, &status, WUNTRACED | WCONTINUED);
if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
tst_res(TFAIL,
"check_monitor child exit with status: %d", status);
tst_res(TPASS, "min_free_kbytes test pass");
}
static void test_tune(unsigned long overcommit_policy)
{
int status;
int pid[3];
int ret, i;
unsigned long tune, memfree, memtotal;
set_sys_tune("overcommit_memory", overcommit_policy, 1);
for (i = 0; i < 3; i++) {
/* case1 */
if (i == 0)
set_sys_tune("min_free_kbytes", default_tune, 1);
/* case2 */
else if (i == 1) {
set_sys_tune("min_free_kbytes", 2 * default_tune, 1);
/* case3 */
} else {
memfree = SAFE_READ_MEMINFO("MemFree:");
memtotal = SAFE_READ_MEMINFO("MemTotal:");
tune = memfree / 20;
if (tune > (memtotal / 50))
tune = memtotal / 50;
set_sys_tune("min_free_kbytes", tune, 1);
}
fflush(stdout);
switch (pid[i] = fork()) {
case -1:
tst_brk(TBROK | TERRNO, "fork");
case 0:
ret = eatup_mem(overcommit_policy);
exit(ret);
}
SAFE_WAITPID(pid[i], &status, WUNTRACED | WCONTINUED);
if (overcommit_policy == 2) {
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
tst_res(TFAIL,
"child unexpectedly failed: %d",
status);
} else if (overcommit_policy == 1) {
if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGKILL)
#ifdef TST_ABI32
{
if (total_mem < 3145728UL)
#endif
tst_res(TFAIL,
"child unexpectedly failed: %d",
status);
#ifdef TST_ABI32
/* in 32-bit system, a process allocate about 3Gb memory at most */
else
tst_res(TINFO, "Child can't allocate "
">3Gb memory in 32bit system");
}
#endif
} else {
if (WIFEXITED(status)) {
if (WEXITSTATUS(status) != 0) {
tst_res(TFAIL, "child unexpectedly "
"failed: %d", status);
}
} else if (!WIFSIGNALED(status) ||
WTERMSIG(status) != SIGKILL) {
tst_res(TFAIL,
"child unexpectedly failed: %d",
status);
}
}
}
}
static int eatup_mem(unsigned long overcommit_policy)
{
int ret = 0;
unsigned long memfree;
void *addrs;
memfree = SAFE_READ_MEMINFO("MemFree:");
printf("memfree is %lu kB before eatup mem\n", memfree);
while (1) {
addrs = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (addrs == MAP_FAILED) {
if (overcommit_policy != 1 && errno != ENOMEM) {
perror("mmap");
ret = -1;
}
break;
}
memset(addrs, 1, MAP_SIZE);
}
memfree = SAFE_READ_MEMINFO("MemFree:");
printf("memfree is %lu kB after eatup mem\n", memfree);
return ret;
}
static void check_monitor(void)
{
unsigned long tune;
unsigned long memfree;
while (end) {
memfree = SAFE_READ_MEMINFO("MemFree:");
tune = get_sys_tune("min_free_kbytes");
if (memfree < tune) {
tst_res(TINFO, "MemFree is %lu kB, "
"min_free_kbytes is %lu kB", memfree, tune);
tst_res(TFAIL, "MemFree < min_free_kbytes");
}
sleep(2);
}
}
static void sighandler(int signo LTP_ATTRIBUTE_UNUSED)
{
end = 1;
}
static void setup(void)
{
if (get_sys_tune("panic_on_oom")) {
tst_brk(TCONF,
"panic_on_oom is set, disable it to run these testcases");
}
total_mem = SAFE_READ_MEMINFO("MemTotal:") + SAFE_READ_MEMINFO("SwapTotal:");
default_tune = get_sys_tune("min_free_kbytes");
orig_overcommit = get_sys_tune("overcommit_memory");
}
static void cleanup(void)
{
if (default_tune != -1)
set_sys_tune("min_free_kbytes", default_tune, 0);
if (orig_overcommit != -1)
set_sys_tune("overcommit_memory", orig_overcommit, 0);
}
static struct tst_test test = {
.needs_root = 1,
.forks_child = 1,
.max_runtime = TST_UNLIMITED_RUNTIME,
.setup = setup,
.cleanup = cleanup,
.test_all = min_free_kbytes_test,
};
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