From: Caspar Z. <su...@li...> - 2012-03-26 05:49:33
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The branch, master, has been updated via 8b7cc630a58dca3f719380e6e140dda4440e692c (commit) from 7103d3e8e0f9dc1804ba06ee66ee02753e8ce50e (commit) - Log ----------------------------------------------------------------- commit 8b7cc630a58dca3f719380e6e140dda4440e692c Author: Zhouping Liu <zl...@re...> Date: Fri Mar 23 22:12:38 2012 +0800 mm/tunable: add a new testcase min_free_kbytes 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 (0, 1, 2), 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) half of mem_free with all overcommit memory policy Signed-off-by: Zhouping Liu <zl...@re...> Signed-off-by: Wanlong Gao <gao...@cn...> ----------------------------------------------------------------------- Summary of changes: runtest/mm | 2 + testcases/kernel/mem/tunable/min_free_kbytes.c | 237 ++++++++++++++++++++++++ 2 files changed, 239 insertions(+), 0 deletions(-) create mode 100644 testcases/kernel/mem/tunable/min_free_kbytes.c diff --git a/runtest/mm b/runtest/mm index be3b342..2dd66f0 100644 --- a/runtest/mm +++ b/runtest/mm @@ -98,3 +98,5 @@ overcommit_memory overcommit_memory -R 100 overcommit_memory overcommit_memory -R 200 max_map_count max_map_count -i 10 + +min_free_kbytes min_free_kbytes diff --git a/testcases/kernel/mem/tunable/min_free_kbytes.c b/testcases/kernel/mem/tunable/min_free_kbytes.c new file mode 100644 index 0000000..a69e129 --- /dev/null +++ b/testcases/kernel/mem/tunable/min_free_kbytes.c @@ -0,0 +1,237 @@ +/* + * 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) half of mem_free 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 "usctest.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[]) +{ + 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[2]; + int ret, i; + unsigned long tune, memfree; + + set_sys_tune("overcommit_memory", overcommit_policy, 1); + + for (i = 0; i < 2; i++) { + /* case1 */ + if (i == 0) + set_sys_tune("min_free_kbytes", default_tune, 1); + /* case2 */ + else { + memfree = read_meminfo("MemFree:"); + tune = memfree / 2; + 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 (!WIFSIGNALED(status) || WTERMSIG(status) != SIGKILL) + tst_resm(TFAIL, + "child unexpectedly failed: %d", status); + } + } +} + +static int eatup_mem(unsigned long overcommit_policy) +{ + int map_count, i; + int ret = 0; + unsigned long memfree; + void **addrs; + + map_count = total_mem * KB / MAP_SIZE; + addrs = (void **)malloc(map_count * sizeof(void *)); + if (addrs == NULL) { + perror("malloc"); + return -1; + } + + memfree = read_meminfo("MemFree:"); + printf("memfree is %lu kB before eatup mem\n", memfree); + for (i = 0; i < map_count; i++) { + addrs[i] = mmap(NULL, MAP_SIZE, PROT_READ|PROT_WRITE, + MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); + if (addrs[i] == MAP_FAILED) { + if (overcommit_policy != 2 || errno != ENOMEM) { + perror("mmap"); + ret = -1; + } + break; + } + memset(addrs[i], i, 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); + + TEST_CLEANUP; +} hooks/post-receive -- ltp |