You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
159 lines
4.5 KiB
159 lines
4.5 KiB
/*
|
|
* 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.
|
|
*/
|
|
/*
|
|
* swapping01 - first time swap use results in heavy swapping
|
|
*
|
|
* This case is used for testing upstream commit: 50a1598
|
|
*
|
|
* The upstream commit fixed a issue on s390/x platform that heavy
|
|
* swapping might occur in some condition, however since the patch
|
|
* was quite general, this testcase will be run on all supported
|
|
* platforms to ensure no regression been introduced.
|
|
*
|
|
* Details of the upstream fix:
|
|
* On x86 a page without a mapper is by definition not referenced / old.
|
|
* The s390 architecture keeps the reference bit in the storage key and
|
|
* the current code will check the storage key for page without a mapper.
|
|
* This leads to an interesting effect: the first time an s390 system
|
|
* needs to write pages to swap it only finds referenced pages. This
|
|
* causes a lot of pages to get added and written to the swap device.
|
|
* To avoid this behaviour change page_referenced to query the storage
|
|
* key only if there is a mapper of the page.
|
|
*
|
|
* Test Strategy:
|
|
* Try to allocate memory which size is slightly larger than current
|
|
* available memory. After allocation done, continue loop for a while
|
|
* and calculate the used swap size. The used swap size should be small
|
|
* enough, else it indicates that heavy swapping is occured unexpectedly.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include "lapi/abisize.h"
|
|
#include "mem.h"
|
|
|
|
/* allow swapping 1 * phy_mem in maximum */
|
|
#define COE_DELTA 1
|
|
/* will try to alloc 1.3 * phy_mem */
|
|
#define COE_SLIGHT_OVER 0.3
|
|
|
|
static void init_meminfo(void);
|
|
static void do_alloc(void);
|
|
static void check_swapping(void);
|
|
|
|
static long mem_available_init;
|
|
static long swap_free_init;
|
|
static long mem_over;
|
|
static long mem_over_max;
|
|
static pid_t pid;
|
|
|
|
static void test_swapping(void)
|
|
{
|
|
#ifdef TST_ABI32
|
|
tst_brk(TCONF, "test is not designed for 32-bit system.");
|
|
#endif
|
|
|
|
init_meminfo();
|
|
|
|
switch (pid = SAFE_FORK()) {
|
|
case 0:
|
|
do_alloc();
|
|
exit(0);
|
|
default:
|
|
check_swapping();
|
|
}
|
|
}
|
|
|
|
static void init_meminfo(void)
|
|
{
|
|
swap_free_init = SAFE_READ_MEMINFO("SwapFree:");
|
|
if (FILE_LINES_SCANF("/proc/meminfo", "MemAvailable: %ld",
|
|
&mem_available_init)) {
|
|
mem_available_init = SAFE_READ_MEMINFO("MemFree:")
|
|
+ SAFE_READ_MEMINFO("Cached:");
|
|
}
|
|
mem_over = mem_available_init * COE_SLIGHT_OVER;
|
|
mem_over_max = mem_available_init * COE_DELTA;
|
|
|
|
/* at least 10MB available physical memory needed */
|
|
if (mem_available_init < 10240)
|
|
tst_brk(TCONF, "Not enough available mem to test.");
|
|
|
|
if (swap_free_init < mem_over_max)
|
|
tst_brk(TCONF, "Not enough swap space to test.");
|
|
}
|
|
|
|
static void do_alloc(void)
|
|
{
|
|
long mem_count;
|
|
void *s;
|
|
|
|
tst_res(TINFO, "available physical memory: %ld MB",
|
|
mem_available_init / 1024);
|
|
mem_count = mem_available_init + mem_over;
|
|
tst_res(TINFO, "try to allocate: %ld MB", mem_count / 1024);
|
|
s = SAFE_MALLOC(mem_count * 1024);
|
|
memset(s, 1, mem_count * 1024);
|
|
tst_res(TINFO, "memory allocated: %ld MB", mem_count / 1024);
|
|
if (raise(SIGSTOP) == -1)
|
|
tst_brk(TBROK | TERRNO, "kill");
|
|
free(s);
|
|
}
|
|
|
|
static void check_swapping(void)
|
|
{
|
|
int status, i;
|
|
long swap_free_now, swapped;
|
|
|
|
/* wait child stop */
|
|
SAFE_WAITPID(pid, &status, WUNTRACED);
|
|
if (!WIFSTOPPED(status))
|
|
tst_brk(TBROK, "child was not stopped.");
|
|
|
|
/* Still occupying memory, loop for a while */
|
|
i = 0;
|
|
while (i < 10) {
|
|
swap_free_now = SAFE_READ_MEMINFO("SwapFree:");
|
|
sleep(1);
|
|
if (abs(swap_free_now - SAFE_READ_MEMINFO("SwapFree:")) < 512)
|
|
break;
|
|
|
|
i++;
|
|
}
|
|
|
|
swap_free_now = SAFE_READ_MEMINFO("SwapFree:");
|
|
swapped = swap_free_init - swap_free_now;
|
|
if (swapped > mem_over_max) {
|
|
kill(pid, SIGCONT);
|
|
tst_brk(TFAIL, "heavy swapping detected: "
|
|
"%ld MB swapped.", swapped / 1024);
|
|
}
|
|
|
|
tst_res(TPASS, "no heavy swapping detected, %ld MB swapped.",
|
|
swapped / 1024);
|
|
kill(pid, SIGCONT);
|
|
/* wait child exit */
|
|
SAFE_WAITPID(pid, &status, 0);
|
|
}
|
|
|
|
static struct tst_test test = {
|
|
.needs_root = 1,
|
|
.forks_child = 1,
|
|
.test_all = test_swapping,
|
|
};
|