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core-helper.c
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/*
* Copyright (C) 2014-2021 Canonical, Ltd.
* Copyright (C) 2022-2023 Colin Ian King.
*
* 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.
*
*/
#include "stress-ng.h"
#include "git-commit-id.h"
#include "core-builtin.h"
#include "core-capabilities.h"
#include "core-cpu-cache.h"
#include "core-hash.h"
#include "core-pragma.h"
#include "core-sort.h"
#if defined(HAVE_LINUX_FIEMAP_H)
#include <linux/fiemap.h>
#endif
#if defined(HAVE_SYS_AUXV_H)
#include <sys/auxv.h>
#endif
#if defined(HAVE_SYS_CAPABILITY_H)
#include <sys/capability.h>
#endif
#if defined(HAVE_SYS_LOADAVG_H)
#include <sys/loadavg.h>
#endif
#if defined(HAVE_MACH_MACH_H)
#include <mach/mach.h>
#endif
#if defined(HAVE_MACH_VM_STATISTICS_H)
#include <mach/vm_statistics.h>
#endif
#if (defined(__FreeBSD__) || \
defined(__OpenBSD__)) && \
defined(HAVE_SYS_MOUNT_H)
#include <sys/mount.h>
#endif
#if defined(__FreeBSD__) && \
defined(HAVE_SYS_PARAM_H)
#include <sys/param.h>
#endif
#if defined(HAVE_SYS_PRCTL_H)
#include <sys/prctl.h>
#endif
#if defined(HAVE_SYS_STATVFS_H)
#include <sys/statvfs.h>
#endif
#if defined(HAVE_SYS_SYSCTL_H)
STRESS_PRAGMA_PUSH
STRESS_PRAGMA_WARN_CPP_OFF
#include <sys/sysctl.h>
STRESS_PRAGMA_POP
#endif
#if defined(HAVE_SYS_UTSNAME_H)
#include <sys/utsname.h>
#endif
#if defined(HAVE_LINUX_FS_H)
#include <linux/fs.h>
#endif
#if defined(HAVE_SYS_VFS_H)
#include <sys/vfs.h>
#endif
#if defined(HAVE_LINUX_MAGIC_H)
#include <linux/magic.h>
#endif
#if defined(HAVE_UVM_UVM_EXTERN_H)
#include <uvm/uvm_extern.h>
#endif
/* prctl(2) timer slack support */
#if defined(HAVE_SYS_PRCTL_H) && \
defined(HAVE_PRCTL) && \
defined(PR_SET_TIMERSLACK) && \
defined(PR_GET_TIMERSLACK)
#define HAVE_PRCTL_TIMER_SLACK
#endif
#if defined(NSIG)
#define STRESS_NSIG NSIG
#elif defined(_NSIG)
#define STRESS_NSIG _NSIG
#endif
#if defined(__TINYC__) || defined(__PCC__)
int __dso_handle;
#endif
#define PAGE_4K_SHIFT (12)
#define PAGE_4K (1 << PAGE_4K_SHIFT)
#define STRESS_ABS_MIN_STACK_SIZE (64 * 1024)
static bool stress_stack_check_flag;
typedef struct {
const unsigned long fs_magic;
const char * fs_name;
} stress_fs_name_t;
#if defined(HAVE_LINUX_MAGIC_H) && \
defined(HAVE_SYS_STATFS_H)
static const stress_fs_name_t stress_fs_names[] = {
#if defined(ADFS_SUPER_MAGIC)
{ ADFS_SUPER_MAGIC, "adfs" },
#endif
#if defined(AFFS_SUPER_MAGIC)
{ AFFS_SUPER_MAGIC, "affs" },
#endif
#if defined(AFS_SUPER_MAGIC)
{ AFS_SUPER_MAGIC, "afs" },
#endif
#if defined(AUTOFS_SUPER_MAGIC)
{ AUTOFS_SUPER_MAGIC, "autofs" },
#endif
#if defined(CEPH_SUPER_MAGIC)
{ CEPH_SUPER_MAGIC, "ceph" },
#endif
#if defined(CODA_SUPER_MAGIC)
{ CODA_SUPER_MAGIC, "coda" },
#endif
#if defined(CRAMFS_MAGIC)
{ CRAMFS_MAGIC, "cramfs" },
#endif
#if defined(CRAMFS_MAGIC_WEND)
{ CRAMFS_MAGIC, "cramfs" },
#endif
#if defined(DEBUGFS_MAGIC)
{ DEBUGFS_MAGIC, "debugfs" },
#endif
#if defined(SECURITYFS_MAGIC)
{ SECURITYFS_MAGIC, "securityfs" },
#endif
#if defined(SELINUX_MAGIC)
{ SELINUX_MAGIC, "selinux" },
#endif
#if defined(SMACK_MAGIC)
{ SMACK_MAGIC, "smack" },
#endif
#if defined(RAMFS_MAGIC)
{ RAMFS_MAGIC, "ramfs" },
#endif
#if defined(TMPFS_MAGIC)
{ TMPFS_MAGIC, "tmpfs" },
#endif
#if defined(HUGETLBFS_MAGIC)
{ HUGETLBFS_MAGIC, "hugetlbfs" },
#endif
#if defined(SQUASHFS_MAGIC)
{ SQUASHFS_MAGIC, "squashfs" },
#endif
#if defined(ECRYPTFS_SUPER_MAGIC)
{ ECRYPTFS_SUPER_MAGIC, "ecryptfs" },
#endif
#if defined(EFS_SUPER_MAGIC)
{ EFS_SUPER_MAGIC, "efs" },
#endif
#if defined(EROFS_SUPER_MAGIC_V1)
{ EROFS_SUPER_MAGIC_V1, "erofs" },
#endif
#if defined(EXT2_SUPER_MAGIC)
{ EXT2_SUPER_MAGIC, "ext2" },
#endif
#if defined(EXT3_SUPER_MAGIC)
{ EXT3_SUPER_MAGIC, "ext3" },
#endif
#if defined(XENFS_SUPER_MAGIC)
{ XENFS_SUPER_MAGIC, "xenfs" },
#endif
#if defined(EXT4_SUPER_MAGIC)
{ EXT4_SUPER_MAGIC, "ext4" },
#endif
#if defined(BTRFS_SUPER_MAGIC)
{ BTRFS_SUPER_MAGIC, "btrfs" },
#endif
#if defined(NILFS_SUPER_MAGIC)
{ NILFS_SUPER_MAGIC, "nilfs" },
#endif
#if defined(F2FS_SUPER_MAGIC)
{ F2FS_SUPER_MAGIC, "f2fs" },
#endif
#if defined(HPFS_SUPER_MAGIC)
{ HPFS_SUPER_MAGIC, "hpfs" },
#endif
#if defined(ISOFS_SUPER_MAGIC)
{ ISOFS_SUPER_MAGIC, "isofs" },
#endif
#if defined(JFFS2_SUPER_MAGIC)
{ JFFS2_SUPER_MAGIC, "jffs2" },
#endif
#if defined(XFS_SUPER_MAGIC)
{ XFS_SUPER_MAGIC, "xfs" },
#endif
#if defined(PSTOREFS_MAGIC)
{ PSTOREFS_MAGIC, "pstorefs" },
#endif
#if defined(EFIVARFS_MAGIC)
{ EFIVARFS_MAGIC, "efivars" },
#endif
#if defined(HOSTFS_SUPER_MAGIC)
{ HOSTFS_SUPER_MAGIC, "hostfs" },
#endif
#if defined(OVERLAYFS_SUPER_MAGIC)
{ OVERLAYFS_SUPER_MAGIC, "overlayfs" },
#endif
#if defined(FUSE_SUPER_MAGIC)
{ FUSE_SUPER_MAGIC, "fuse" },
#endif
#if defined(MINIX_SUPER_MAGIC)
{ MINIX_SUPER_MAGIC, "minix" },
#endif
#if defined(MINIX_SUPER_MAGIC2)
{ MINIX_SUPER_MAGIC2, "minix" },
#endif
#if defined(MINIX2_SUPER_MAGIC)
{ MINIX2_SUPER_MAGIC, "minix2" },
#endif
#if defined(MINIX2_SUPER_MAGIC2)
{ MINIX2_SUPER_MAGIC2, "minix2" },
#endif
#if defined(MINIX3_SUPER_MAGIC)
{ MINIX3_SUPER_MAGIC, "minix3" },
#endif
#if defined(MSDOS_SUPER_MAGIC)
{ MSDOS_SUPER_MAGIC, "msdos" },
#endif
#if defined(EXFAT_SUPER_MAGIC)
{ EXFAT_SUPER_MAGIC, "exfat" },
#endif
#if defined(NCP_SUPER_MAGIC)
{ NCP_SUPER_MAGIC, "ncp" },
#endif
#if defined(NFS_SUPER_MAGIC)
{ NFS_SUPER_MAGIC, "nfs" },
#endif
#if defined(OCFS2_SUPER_MAGIC)
{ OCFS2_SUPER_MAGIC, "ocfs2" },
#endif
#if defined(OPENPROM_SUPER_MAGIC)
{ OPENPROM_SUPER_MAGIC, "openprom" },
#endif
#if defined(QNX4_SUPER_MAGIC)
{ QNX4_SUPER_MAGIC, "qnx4" },
#endif
#if defined(QNX6_SUPER_MAGIC)
{ QNX6_SUPER_MAGIC, "qnx6" },
#endif
#if defined(AFS_FS_MAGIC)
{ AFS_FS_MAGIC, "afs" },
#endif
#if defined(REISERFS_SUPER_MAGIC)
{ REISERFS_SUPER_MAGIC, "reiserfs" },
#endif
#if defined(SMB_SUPER_MAGIC)
{ SMB_SUPER_MAGIC, "smb" },
#endif
#if defined(CIFS_SUPER_MAGIC)
{ CIFS_SUPER_MAGIC, "cifs" },
#endif
#if defined(SMB2_SUPER_MAGIC)
{ SMB2_SUPER_MAGIC, "smb2" },
#endif
#if defined(CGROUP_SUPER_MAGIC)
{ CGROUP_SUPER_MAGIC, "cgroup" },
#endif
#if defined(CGROUP2_SUPER_MAGIC)
{ CGROUP2_SUPER_MAGIC, "cgroup2" },
#endif
#if defined(RDTGROUP_SUPER_MAGIC)
{ RDTGROUP_SUPER_MAGIC, "rdtgroup" },
#endif
#if defined(DAXFS_MAGIC)
{ DAXFS_MAGIC, "daxfs" },
#endif
#if defined(BINFMTFS_MAGIC)
{ BINFMTFS_MAGIC, "binfmtfs" },
#endif
#if defined(DEVPTS_SUPER_MAGIC)
{ DEVPTS_SUPER_MAGIC, "devpts" },
#endif
#if defined(BINDERFS_SUPER_MAGIC)
{ BINDERFS_SUPER_MAGIC, "binderfs" },
#endif
#if defined(FUTEXFS_SUPER_MAGIC)
{ FUTEXFS_SUPER_MAGIC, "futexfs" },
#endif
#if defined(PIPEFS_MAGIC)
{ PIPEFS_MAGIC, "pipefs" },
#endif
#if defined(PROC_SUPER_MAGIC)
{ PROC_SUPER_MAGIC, "proc" },
#endif
#if defined(SOCKFS_MAGIC)
{ SOCKFS_MAGIC, "sockfs" },
#endif
#if defined(SYSFS_MAGIC)
{ SYSFS_MAGIC, "sysfs" },
#endif
#if defined(NSFS_MAGIC)
{ NSFS_MAGIC, "nsfs" },
#endif
#if defined(BPF_FS_MAGIC)
{ BPF_FS_MAGIC, "bpf_fs" },
#endif
#if defined(AAFS_MAGIC)
{ AAFS_MAGIC, "aafs" },
#endif
#if defined(ZONEFS_MAGIC)
{ ZONEFS_MAGIC, "zonefs" },
#endif
#if defined(UDF_SUPER_MAGIC)
{ UDF_SUPER_MAGIC, "udf" },
#endif
#if defined(UBIFS_SUPER_MAGIC)
{ UBIFS_SUPER_MAGIC, "ubifs" },
#else
{ 0x24051905, "ubifs" },
#endif
{ 0x1badface, "bfs" },
#if defined(HFS_SUPER_MAGIC)
{ HFS_SUPER_MAGIC, "hfs" },
#else
{ 0x4244, "hfs" },
#endif
#if defined(HFSPLUS_SUPER_MAGIC)
{ HFSPLUS_SUPER_MAGIC, "hfsplus" },
#else
{ 0x482b, "hfsplus" },
#endif
#if defined(JFS_SUPER_MAGIC)
{ JFS_SUPER_MAGIC, "jfs" },
#else
{ 0x3153464a, "jfs" },
#endif
};
#endif
typedef struct {
const int signum;
const char *name;
} stress_sig_name_t;
#define SIG_NAME(x) { x, #x }
static const stress_sig_name_t sig_names[] = {
#if defined(SIGABRT)
SIG_NAME(SIGABRT),
#endif
#if defined(SIGALRM)
SIG_NAME(SIGALRM),
#endif
#if defined(SIGBUS)
SIG_NAME(SIGBUS),
#endif
#if defined(SIGCHLD)
SIG_NAME(SIGCHLD),
#endif
#if defined(SIGCLD)
SIG_NAME(SIGCLD),
#endif
#if defined(SIGCONT)
SIG_NAME(SIGCONT),
#endif
#if defined(SIGEMT)
SIG_NAME(SIGEMT),
#endif
#if defined(SIGFPE)
SIG_NAME(SIGFPE),
#endif
#if defined(SIGHUP)
SIG_NAME(SIGHUP),
#endif
#if defined(SIGILL)
SIG_NAME(SIGILL),
#endif
#if defined(SIGINFO)
SIG_NAME(SIGINFO),
#endif
#if defined(SIGINT)
SIG_NAME(SIGINT),
#endif
#if defined(SIGIO)
SIG_NAME(SIGIO),
#endif
#if defined(SIGIOT)
SIG_NAME(SIGIOT),
#endif
#if defined(SIGKILL)
SIG_NAME(SIGKILL),
#endif
#if defined(SIGLOST)
SIG_NAME(SIGLOST),
#endif
#if defined(SIGPIPE)
SIG_NAME(SIGPIPE),
#endif
#if defined(SIGPOLL)
SIG_NAME(SIGPOLL),
#endif
#if defined(SIGPROF)
SIG_NAME(SIGPROF),
#endif
#if defined(SIGPWR)
SIG_NAME(SIGPWR),
#endif
#if defined(SIGQUIT)
SIG_NAME(SIGQUIT),
#endif
#if defined(SIGSEGV)
SIG_NAME(SIGSEGV),
#endif
#if defined(SIGSTKFLT)
SIG_NAME(SIGSTKFLT),
#endif
#if defined(SIGSTOP)
SIG_NAME(SIGSTOP),
#endif
#if defined(SIGTSTP)
SIG_NAME(SIGTSTP),
#endif
#if defined(SIGSYS)
SIG_NAME(SIGSYS),
#endif
#if defined(SIGTERM)
SIG_NAME(SIGTERM),
#endif
#if defined(SIGTRAP)
SIG_NAME(SIGTRAP),
#endif
#if defined(SIGTTIN)
SIG_NAME(SIGTTIN),
#endif
#if defined(SIGTTOU)
SIG_NAME(SIGTTOU),
#endif
#if defined(SIGUNUSED)
SIG_NAME(SIGUNUSED),
#endif
#if defined(SIGURG)
SIG_NAME(SIGURG),
#endif
#if defined(SIGUSR1)
SIG_NAME(SIGUSR1),
#endif
#if defined(SIGUSR2)
SIG_NAME(SIGUSR2),
#endif
#if defined(SIGVTALRM)
SIG_NAME(SIGVTALRM),
#endif
#if defined(SIGXCPU)
SIG_NAME(SIGXCPU),
#endif
#if defined(SIGXFSZ)
SIG_NAME(SIGXFSZ),
#endif
#if defined(SIGWINCH)
SIG_NAME(SIGWINCH),
#endif
};
static char *stress_temp_path;
/*
* stress_temp_path_free()
* free and NULLify temporary file path
*/
void stress_temp_path_free(void)
{
if (stress_temp_path)
free(stress_temp_path);
stress_temp_path = NULL;
}
/*
* stress_set_temp_path()
* set temporary file path, default
* is . - current dir
*/
int stress_set_temp_path(const char *path)
{
stress_temp_path_free();
stress_temp_path = stress_const_optdup(path);
if (!stress_temp_path) {
(void)fprintf(stderr, "aborting: cannot allocate memory for '%s'\n", path);
return -1;
}
return 0;
}
/*
* stress_get_temp_path()
* get temporary file path, return "." if null
*/
const char *stress_get_temp_path(void)
{
if (!stress_temp_path)
return ".";
return stress_temp_path;
}
/*
* stress_check_temp_path()
* check if temp path is accessible
*/
int stress_check_temp_path(void)
{
const char *path = stress_get_temp_path();
if (access(path, R_OK | W_OK) < 0) {
(void)fprintf(stderr, "aborting: temp-path '%s' must be readable "
"and writeable\n", path);
return -1;
}
return 0;
}
/*
* stress_mk_filename()
* generate a full file name from a path and filename
*/
size_t stress_mk_filename(
char *fullname,
const size_t fullname_len,
const char *pathname,
const char *filename)
{
/*
* This may not be efficient, but it works. Do not
* be tempted to optimize this, it is not used frequently
* and is not a CPU bottleneck.
*/
(void)shim_strlcpy(fullname, pathname, fullname_len);
(void)shim_strlcat(fullname, "/", fullname_len);
return shim_strlcat(fullname, filename, fullname_len);
}
/*
* stress_get_page_size()
* get page_size
*/
size_t stress_get_page_size(void)
{
static size_t page_size = 0;
/* Use cached size */
if (page_size > 0)
return page_size;
#if defined(_SC_PAGESIZE)
{
/* Use modern sysconf */
const long sz = sysconf(_SC_PAGESIZE);
if (sz > 0) {
page_size = (size_t)sz;
return page_size;
}
}
#else
UNEXPECTED
#endif
#if defined(HAVE_GETPAGESIZE)
{
/* Use deprecated getpagesize */
const long sz = getpagesize();
if (sz > 0) {
page_size = (size_t)sz;
return page_size;
}
}
#endif
/* Guess */
page_size = PAGE_4K;
return page_size;
}
/*
* stress_get_processors_online()
* get number of processors that are online
*/
int32_t stress_get_processors_online(void)
{
static int32_t processors_online = 0;
if (processors_online > 0)
return processors_online;
#if defined(_SC_NPROCESSORS_ONLN)
processors_online = (int32_t)sysconf(_SC_NPROCESSORS_ONLN);
if (processors_online < 0)
processors_online = 1;
#else
processors_online = 1;
UNEXPECTED
#endif
return processors_online;
}
/*
* stress_get_processors_configured()
* get number of processors that are configured
*/
int32_t stress_get_processors_configured(void)
{
static int32_t processors_configured = 0;
if (processors_configured > 0)
return processors_configured;
#if defined(_SC_NPROCESSORS_CONF)
processors_configured = (int32_t)sysconf(_SC_NPROCESSORS_CONF);
if (processors_configured < 0)
processors_configured = stress_get_processors_online();
#else
processors_configured = 1;
UNEXPECTED
#endif
return processors_configured;
}
/*
* stress_get_ticks_per_second()
* get number of ticks perf second
*/
int32_t stress_get_ticks_per_second(void)
{
#if defined(_SC_CLK_TCK)
static int32_t ticks_per_second = 0;
if (ticks_per_second > 0)
return ticks_per_second;
ticks_per_second = (int32_t)sysconf(_SC_CLK_TCK);
return ticks_per_second;
#else
UNEXPECTED
return -1;
#endif
}
/*
* stress_get_meminfo()
* wrapper for linux sysinfo
*/
static int stress_get_meminfo(
size_t *freemem,
size_t *totalmem,
size_t *freeswap,
size_t *totalswap)
{
#if defined(HAVE_SYS_SYSINFO_H) && \
defined(HAVE_SYSINFO)
struct sysinfo info;
(void)memset(&info, 0, sizeof(info));
if (sysinfo(&info) == 0) {
*freemem = info.freeram * info.mem_unit;
*totalmem = info.totalram * info.mem_unit;
*freeswap = info.freeswap * info.mem_unit;
*totalswap = info.totalswap * info.mem_unit;
return 0;
}
#endif
#if defined(__FreeBSD__)
{
const size_t page_size = (size_t)stress_bsd_getsysctl_uint("vm.stats.vm.v_page_size");
#if 0
/*
* Enable total swap only when we can determine free swap
*/
const size_t max_size_t = (size_t)-1;
const uint64_t vm_swap_total = stress_bsd_getsysctl_uint64("vm.swap_total");
*totalswap = (vm_swap_total >= max_size_t) ? max_size_t : (size_t)vm_swap_total;
#endif
*freemem = page_size * stress_bsd_getsysctl_uint32("vm.stats.vm.v_free_count");
*totalmem = page_size *
(stress_bsd_getsysctl_uint32("vm.stats.vm.v_active_count") +
stress_bsd_getsysctl_uint32("vm.stats.vm.v_inactive_count") +
stress_bsd_getsysctl_uint32("vm.stats.vm.v_laundry_count") +
stress_bsd_getsysctl_uint32("vm.stats.vm.v_wire_count") +
stress_bsd_getsysctl_uint32("vm.stats.vm.v_free_count"));
return 0;
}
#endif
#if defined(__NetBSD__) && \
defined(HAVE_UVM_UVM_EXTERN_H)
{
struct uvmexp_sysctl u;
if (stress_bsd_getsysctl("vm.uvmexp2", &u, sizeof(u)) == 0) {
*freemem = (size_t)u.free * u.pagesize;
*totalmem = (size_t)u.npages * u.pagesize;
*totalswap = (size_t)u.swpages * u.pagesize;
*freeswap = *totalswap - (size_t)u.swpginuse * u.pagesize;
return 0;
}
}
#endif
#if defined(__APPLE__) && \
defined(HAVE_MACH_MACH_H) && \
defined(HAVE_MACH_VM_STATISTICS_H)
{
vm_statistics64_data_t vm_stat;
mach_port_t host = mach_host_self();
natural_t count = HOST_VM_INFO64_COUNT;
size_t page_size = stress_get_page_size();
int ret;
/* zero vm_stat, keep cppcheck silent */
(void)memset(&vm_stat, 0, sizeof(vm_stat));
ret = host_statistics64(host, HOST_VM_INFO64, (host_info64_t)&vm_stat, &count);
if (ret >= 0) {
*freemem = page_size * vm_stat.free_count;
*totalmem = page_size * (vm_stat.active_count +
vm_stat.inactive_count +
vm_stat.wire_count +
vm_stat.zero_fill_count);
return 0;
}
}
#endif
*freemem = 0;
*totalmem = 0;
*freeswap = 0;
*totalswap = 0;
return -1;
}
/*
* stress_get_memlimits()
* get SHMALL and memory in system
* these are set to zero on failure
*/
void stress_get_memlimits(
size_t *shmall,
size_t *freemem,
size_t *totalmem,
size_t *freeswap,
size_t *totalswap)
{
FILE *fp;
(void)stress_get_meminfo(freemem, totalmem, freeswap, totalswap);
*shmall = 0;
fp = fopen("/proc/sys/kernel/shmall", "r");
if (!fp)
return;
if (fscanf(fp, "%zu", shmall) != 1) {
(void)fclose(fp);
return;
}
(void)fclose(fp);
}
#define PR_SET_MEMORY_MERGE 67
/*
* stress_ksm_memory_merge()
* set kernel samepage merging flag (linux only)
*/
void stress_ksm_memory_merge(const int flag)
{
#if defined(__linux__) && \
defined(PR_SET_MEMORY_MERGE)
static int prev_flag = -1;
if ((flag >= 0) && (flag <= 1)) {
if (flag != prev_flag){
VOID_RET(int, prctl(PR_SET_MEMORY_MERGE, flag));
prev_flag = flag;
}
}
#else
(void)flag;
#endif
}
/*
* stress_low_memory()
* return true if running low on memory
*/
bool stress_low_memory(const size_t requested)
{
static size_t prev_freemem = 0;
static size_t prev_freeswap = 0;
size_t freemem, totalmem, freeswap, totalswap;
static double threshold = -1.0;
bool low_memory = false;
if (stress_get_meminfo(&freemem, &totalmem, &freeswap, &totalswap) == 0) {
/*
* Threshold not set, then get
*/
if (threshold < 0.0) {
size_t bytes = 0;
if (stress_get_setting("oom-avoid-bytes", &bytes)) {
threshold = 100.0 * (double)bytes / (double)freemem;
} else {
/* Not specified, then default to 2.5% */
threshold = 2.5;
}
}
/*
* Stats from previous call valid, then check for memory
* changes
*/
if ((prev_freemem + prev_freeswap) > 0) {
ssize_t delta;
delta = (ssize_t)prev_freemem - (ssize_t)freemem;
delta = (delta * 2) + requested;
/* memory shrinking quickly? */
if (delta > (ssize_t)freemem) {
low_memory = true;
goto update;
}
/* swap shrinking quickly? */
delta = (ssize_t)prev_freeswap - (ssize_t)freeswap;
if (delta > 0) {
low_memory = true;
goto update;
}
}
/* Not enough for allocation and slop? */
if (freemem < ((4 * MB) + requested)) {
low_memory = true;
goto update;
}
/* Less than 3% left? */
if (((double)freemem * 100.0 / (double)(totalmem - requested)) < threshold) {
low_memory = true;
goto update;
}
/* Any swap enabled and is it running low? */
if ((totalswap > 0) && (freeswap < (2 * MB) + requested)) {
low_memory = true;
goto update;
}
update:
prev_freemem = freemem;
prev_freeswap = freeswap;
/* low memory? automatically enable ksm memory merging */
if (low_memory)
stress_ksm_memory_merge(1);
}
return low_memory;
}
#if defined(_SC_AVPHYS_PAGES)
#define STRESS_SC_PAGES _SC_AVPHYS_PAGES
#elif defined(_SC_PHYS_PAGES)
#define STRESS_SC_PAGES _SC_PHYS_PAGES
#endif
/*
* stress_get_phys_mem_size()
* get size of physical memory still available, 0 if failed
*/
uint64_t stress_get_phys_mem_size(void)
{
#if defined(STRESS_SC_PAGES)
uint64_t phys_pages = 0;
const size_t page_size = stress_get_page_size();
const uint64_t max_pages = ~0ULL / page_size;
phys_pages = (uint64_t)sysconf(STRESS_SC_PAGES);
/* Avoid overflow */
if (phys_pages > max_pages)
phys_pages = max_pages;
return phys_pages * page_size;
#else
UNEXPECTED
return 0ULL;
#endif
}
/*
* stress_get_filesystem_size()
* get size of free space still available on the
* file system where stress temporary path is located,
* return 0 if failed
*/
uint64_t stress_get_filesystem_size(void)
{
#if defined(HAVE_SYS_STATVFS_H)
int rc;
struct statvfs buf;
fsblkcnt_t blocks, max_blocks;
const char *path = stress_get_temp_path();
if (!path)
return 0;
(void)memset(&buf, 0, sizeof(buf));
rc = statvfs(path, &buf);
if (rc < 0)
return 0;
max_blocks = (~(fsblkcnt_t)0) / buf.f_bsize;
blocks = buf.f_bavail;
if (blocks > max_blocks)
blocks = max_blocks;
return (uint64_t)buf.f_bsize * blocks;
#else
UNEXPECTED
return 0ULL;
#endif
}
/*
* stress_get_filesystem_available_inodes()
* get number of free available inodes on the current stress
* temporary path, return 0 if failed
*/
uint64_t stress_get_filesystem_available_inodes(void)
{
#if defined(HAVE_SYS_STATVFS_H)
int rc;
struct statvfs buf;
const char *path = stress_get_temp_path();
if (!path)
return 0;
(void)memset(&buf, 0, sizeof(buf));
rc = statvfs(path, &buf);
if (rc < 0)
return 0;
return (uint64_t)buf.f_favail;
#else
UNEXPECTED
return 0ULL;
#endif
}
/*
* stress_set_nonblock()
* try to make fd non-blocking
*/
int stress_set_nonblock(const int fd)
{
int flags;
#if defined(O_NONBLOCK)
if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
flags = 0;
return fcntl(fd, F_SETFL, O_NONBLOCK | flags);
#else
UNEXPECTED
flags = 1;
return ioctl(fd, FIOBIO, &flags);
#endif
}
/*
* stress_get_load_avg()
* get load average
*/