| /* |
| * 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 |
| * |
| ******************************************************************** |
| * Copyright (C) 2012 Red Hat, Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * Further, this software is distributed without any warranty that it |
| * is free of the rightful claim of any third person regarding |
| * infringement or the like. Any license provided herein, whether |
| * implied or otherwise, applies only to this software file. Patent |
| * licenses, if any, provided herein do not apply to combinations of |
| * this program with other software, or any other product whatsoever. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA. |
| * |
| * ******************************************************************** |
| */ |
| |
| #include <sys/types.h> |
| #include <sys/mman.h> |
| #include <sys/wait.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "test.h" |
| #include "mem.h" |
| |
| #define MAP_SIZE (1UL<<20) |
| |
| volatile int end; |
| char *TCID = "min_free_kbytes"; |
| int TST_TOTAL = 1; |
| static unsigned long default_tune; |
| static unsigned long orig_overcommit; |
| 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); |
| |
| int main(int argc, char *argv[]) |
| { |
| const char *msg; |
| int lc, pid, status; |
| struct sigaction sa; |
| |
| sa.sa_handler = sighandler; |
| if (sigemptyset(&sa.sa_mask) < 0) |
| tst_brkm(TBROK | TERRNO, cleanup, "sigemptyset"); |
| sa.sa_flags = 0; |
| if (sigaction(SIGUSR1, &sa, NULL) < 0) |
| tst_brkm(TBROK | TERRNO, cleanup, "sigaction"); |
| |
| msg = parse_opts(argc, argv, NULL, NULL); |
| if (msg != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR -s %s", msg); |
| setup(); |
| |
| switch (pid = fork()) { |
| case -1: |
| tst_brkm(TBROK | TERRNO, cleanup, "fork"); |
| |
| case 0: |
| /* startup the check monitor */ |
| check_monitor(); |
| exit(0); |
| } |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| tst_count = 0; |
| |
| test_tune(2); |
| test_tune(0); |
| test_tune(1); |
| } |
| |
| if (kill(pid, SIGUSR1) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "kill %d", pid); |
| if (waitpid(pid, &status, WUNTRACED | WCONTINUED) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "waitpid"); |
| if (WIFEXITED(status) && WEXITSTATUS(status) != 0) |
| tst_resm(TFAIL, |
| "check_monitor child exit with status: %d", status); |
| |
| cleanup(); |
| tst_exit(); |
| } |
| |
| 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 = read_meminfo("MemFree:"); |
| memtotal = 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_brkm(TBROK | TERRNO, cleanup, "fork"); |
| case 0: |
| ret = eatup_mem(overcommit_policy); |
| exit(ret); |
| } |
| |
| if (waitpid(pid[i], &status, WUNTRACED | WCONTINUED) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "waitpid"); |
| |
| if (overcommit_policy == 2) { |
| if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) |
| tst_resm(TFAIL, |
| "child unexpectedly failed: %d", |
| status); |
| } else if (overcommit_policy == 1) { |
| if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGKILL) |
| #if __WORDSIZE == 32 |
| { |
| if (total_mem < 3145728UL) |
| #endif |
| tst_resm(TFAIL, |
| "child unexpectedly failed: %d", |
| status); |
| #if __WORDSIZE == 32 |
| /* in 32-bit system, a process allocate about 3Gb memory at most */ |
| else |
| tst_resm(TINFO, "Child can't allocate " |
| ">3Gb memory in 32bit system"); |
| } |
| #endif |
| } else { |
| if (WIFEXITED(status)) { |
| if (WEXITSTATUS(status) != 0) { |
| tst_resm(TFAIL, "child unexpectedly " |
| "failed: %d", status); |
| } |
| } else if (!WIFSIGNALED(status) || |
| WTERMSIG(status) != SIGKILL) { |
| tst_resm(TFAIL, |
| "child unexpectedly failed: %d", |
| status); |
| } |
| } |
| } |
| } |
| |
| static int eatup_mem(unsigned long overcommit_policy) |
| { |
| int ret = 0; |
| unsigned long memfree; |
| void *addrs; |
| |
| memfree = 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 = 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 = read_meminfo("MemFree:"); |
| tune = get_sys_tune("min_free_kbytes"); |
| |
| if (memfree < tune) { |
| tst_resm(TINFO, "MemFree is %lu kB, " |
| "min_free_kbytes is %lu kB", memfree, tune); |
| tst_resm(TFAIL, "MemFree < min_free_kbytes"); |
| } |
| |
| sleep(2); |
| } |
| } |
| |
| static void sighandler(int signo LTP_ATTRIBUTE_UNUSED) |
| { |
| end = 1; |
| } |
| |
| void setup(void) |
| { |
| tst_require_root(NULL); |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| TEST_PAUSE; |
| |
| total_mem = read_meminfo("MemTotal:") + read_meminfo("SwapTotal:"); |
| |
| default_tune = get_sys_tune("min_free_kbytes"); |
| orig_overcommit = get_sys_tune("overcommit_memory"); |
| } |
| |
| void cleanup(void) |
| { |
| set_sys_tune("min_free_kbytes", default_tune, 0); |
| set_sys_tune("overcommit_memory", orig_overcommit, 0); |
| } |