forked from libhugetlbfs/libhugetlbfs
/
hugeadm.c
1714 lines (1448 loc) · 43.8 KB
/
hugeadm.c
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/***************************************************************************
* User front end for using huge pages Copyright (C) 2008, IBM *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the Lesser GNU General Public License as *
* published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. *
* *
* You should have received a copy of the Lesser GNU General Public *
* License along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
/*
* hugeadm is designed to make an administrators life simpler, to automate
* and simplify basic system configuration as it relates to hugepages. It
* is designed to help with pool and mount configuration.
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include <mntent.h>
#include <unistd.h>
#include <grp.h>
#include <pwd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/swap.h>
#include <sys/wait.h>
#define _GNU_SOURCE /* for getopt_long */
#include <unistd.h>
#include <getopt.h>
#define KB (1024)
#define MB (1024*KB)
#define GB (1024*MB)
#define REPORT_UTIL "hugeadm"
#define REPORT(level, prefix, format, ...) \
do { \
if (verbose_level >= level) \
fprintf(stderr, "hugeadm:" prefix ": " format, \
##__VA_ARGS__); \
} while (0);
#include "libhugetlbfs_internal.h"
#include "hugetlbfs.h"
extern int optind;
extern char *optarg;
#define OPTION(opts, text) fprintf(stderr, " %-25s %s\n", opts, text)
#define CONT(text) fprintf(stderr, " %-25s %s\n", "", text)
#define MOUNT_DIR "/var/lib/hugetlbfs"
#define OPT_MAX 4096
#define PROCMOUNTS "/proc/mounts"
#define PROCHUGEPAGES_MOVABLE "/proc/sys/vm/hugepages_treat_as_movable"
#define PROCMINFREEKBYTES "/proc/sys/vm/min_free_kbytes"
#define PROCSHMMAX "/proc/sys/kernel/shmmax"
#define PROCHUGETLBGROUP "/proc/sys/vm/hugetlb_shm_group"
#define PROCZONEINFO "/proc/zoneinfo"
#define FS_NAME "hugetlbfs"
#define MIN_COL 20
#define MAX_SIZE_MNTENT (64 + PATH_MAX + 32 + 128 + 2 * sizeof(int))
#define FORMAT_LEN 20
#define MEM_TOTAL "MemTotal:"
#define SWAP_FREE "SwapFree:"
#define SWAP_TOTAL "SwapTotal:"
#define ALWAYS "always"
#define MADVISE "madvise"
#define NEVER "never"
#define TRANS_ENABLE "/sys/kernel/mm/transparent_hugepage/enabled"
#define KHUGE_SCAN_PAGES "/sys/kernel/mm/transparent_hugepage/khugepaged/pages_to_scan"
#define KHUGE_SCAN_SLEEP "/sys/kernel/mm/transparent_hugepage/khugepaged/scan_sleep_millisecs"
#define KHUGE_ALLOC_SLEEP "/sys/kernel/mm/transparent_hugepage/khugepaged/alloc_sleep_millisecs"
void print_usage()
{
fprintf(stderr, "hugeadm [options]\n");
fprintf(stderr, "options:\n");
OPTION("--list-all-mounts", "List all current hugetlbfs mount points");
OPTION("--pool-list", "List all pools");
OPTION("--hard", "specified with --pool-pages-min to make");
CONT("multiple attempts at adjusting the pool size to the");
CONT("specified count on failure");
OPTION("--pool-pages-min <size|DEFAULT>:[+|-]<pagecount|memsize<G|M|K>>", "");
CONT("Adjust pool 'size' lower bound");
OPTION("--obey-mempolicy", "Obey the NUMA memory policy when");
CONT("adjusting the pool 'size' lower bound");
OPTION("--thp-always", "Enable transparent huge pages always");
OPTION("--thp-madvise", "Enable transparent huge pages with madvise");
OPTION("--thp-never", "Disable transparent huge pages");
OPTION("--thp-khugepaged-pages <pages to scan>", "Number of pages that khugepaged");
CONT("should scan on each pass");
OPTION("--thp-khugepaged-scan-sleep <milliseconds>", "Time in ms to sleep between");
CONT("khugepaged passes");
OPTION("--thp-khugepages-alloc-sleep <milliseconds>", "Time in ms for khugepaged");
CONT("to wait if there was a huge page allocation failure");
OPTION("--pool-pages-max <size|DEFAULT>:[+|-]<pagecount|memsize<G|M|K>>", "");
CONT("Adjust pool 'size' upper bound");
OPTION("--set-recommended-min_free_kbytes", "");
CONT("Sets min_free_kbytes to a recommended value to improve availability of");
CONT("huge pages at runtime");
OPTION("--set-recommended-shmmax", "Sets shmmax to a recommended value to");
CONT("maximise the size possible for shared memory pools");
OPTION("--set-shm-group <gid|groupname>", "Sets hugetlb_shm_group to the");
CONT("specified group, which has permission to use hugetlb shared memory pools");
OPTION("--add-temp-swap[=count]", "Specified with --pool-pages-min to create");
CONT("temporary swap space for the duration of the pool resize. Default swap");
CONT("size is 5 huge pages. Optional arg sets size to 'count' huge pages");
OPTION("--add-ramdisk-swap", "Specified with --pool-pages-min to create");
CONT("swap space on ramdisks. By default, swap is removed after the resize.");
OPTION("--persist", "Specified with --add-temp-swap or --add-ramdisk-swap");
CONT("options to make swap space persist after the resize.");
OPTION("--enable-zone-movable", "Use ZONE_MOVABLE for huge pages");
OPTION("--disable-zone-movable", "Do not use ZONE_MOVABLE for huge pages");
OPTION("--create-mounts", "Creates a mount point for each available");
CONT("huge page size on this system under /var/lib/hugetlbfs");
OPTION("--create-user-mounts <user>", "");
CONT("Creates a mount point for each available huge");
CONT("page size under /var/lib/hugetlbfs/<user>");
CONT("usable by user <user>");
OPTION("--create-group-mounts <group>", "");
CONT("Creates a mount point for each available huge");
CONT("page size under /var/lib/hugetlbfs/<group>");
CONT("usable by group <group>");
OPTION("--create-global-mounts", "");
CONT("Creates a mount point for each available huge");
CONT("page size under /var/lib/hugetlbfs/global");
CONT("usable by anyone");
OPTION("--max-size <size<G|M|K>>", "Limit the filesystem size of a new mount point");
OPTION("--max-inodes <number>", "Limit the number of inodes on a new mount point");
OPTION("--page-sizes", "Display page sizes that a configured pool");
OPTION("--page-sizes-all",
"Display page sizes support by the hardware");
OPTION("--dry-run", "Print the equivalent shell commands for what");
CONT("the specified options would have done without");
CONT("taking any action");
OPTION("--explain", "Gives a overview of the status of the system");
CONT("with respect to huge page availability");
OPTION("--verbose <level>, -v", "Increases/sets tracing levels");
OPTION("--help, -h", "Prints this message");
}
int opt_dry_run = 0;
int opt_hard = 0;
int opt_movable = -1;
int opt_set_recommended_minfreekbytes = 0;
int opt_set_recommended_shmmax = 0;
int opt_set_hugetlb_shm_group = 0;
int opt_temp_swap = 0;
int opt_ramdisk_swap = 0;
int opt_swap_persist = 0;
int opt_obey_mempolicy = 0;
unsigned long opt_limit_mount_size = 0;
int opt_limit_mount_inodes = 0;
int verbose_level = VERBOSITY_DEFAULT;
char ramdisk_list[PATH_MAX] = "";
void setup_environment(char *var, char *val)
{
if (opt_dry_run) {
printf("%s='%s'\n", var, val);
return;
}
setenv(var, val, 1);
DEBUG("%s='%s'\n", var, val);
}
/* Enable/disable allocation of hugepages from ZONE_MOVABLE */
void setup_zone_movable(int able)
{
if (opt_dry_run) {
printf("echo %d > %s\n", able, PROCHUGEPAGES_MOVABLE);
return;
}
DEBUG("Setting %s to %d\n", PROCHUGEPAGES_MOVABLE, able);
/* libhugetlbfs reports any error that occurs */
file_write_ulong(PROCHUGEPAGES_MOVABLE, (unsigned long)able);
}
void verbose_init(void)
{
char *env;
env = getenv("HUGETLB_VERBOSE");
if (env)
verbose_level = atoi(env);
env = getenv("HUGETLB_DEBUG");
if (env)
verbose_level = VERBOSITY_MAX;
}
void verbose(char *which)
{
int new_level;
if (which) {
new_level = atoi(which);
if (new_level < 0 || new_level > 99) {
ERROR("%d: verbosity out of range 0-99\n",
new_level);
exit(EXIT_FAILURE);
}
} else {
new_level = verbose_level + 1;
if (new_level == 100) {
WARNING("verbosity limited to 99\n");
new_level--;
}
}
verbose_level = new_level;
}
void verbose_expose(void)
{
char level[3];
if (verbose_level == 99) {
setup_environment("HUGETLB_DEBUG", "yes");
}
snprintf(level, sizeof(level), "%d", verbose_level);
setup_environment("HUGETLB_VERBOSE", level);
}
/*
* getopts return values for options which are long only.
*/
#define LONG_POOL ('p' << 8)
#define LONG_POOL_LIST (LONG_POOL|'l')
#define LONG_POOL_MIN_ADJ (LONG_POOL|'m')
#define LONG_POOL_MAX_ADJ (LONG_POOL|'M')
#define LONG_POOL_MEMPOL (LONG_POOL|'p')
#define LONG_SET_RECOMMENDED_MINFREEKBYTES ('k' << 8)
#define LONG_SET_RECOMMENDED_SHMMAX ('x' << 8)
#define LONG_SET_HUGETLB_SHM_GROUP ('R' << 8)
#define LONG_MOVABLE ('z' << 8)
#define LONG_MOVABLE_ENABLE (LONG_MOVABLE|'e')
#define LONG_MOVABLE_DISABLE (LONG_MOVABLE|'d')
#define LONG_HARD ('h' << 8)
#define LONG_SWAP ('s' << 8)
#define LONG_SWAP_DISK (LONG_SWAP|'d')
#define LONG_SWAP_RAMDISK (LONG_SWAP|'r')
#define LONG_SWAP_PERSIST (LONG_SWAP|'p')
#define LONG_PAGE ('P' << 8)
#define LONG_PAGE_SIZES (LONG_PAGE|'s')
#define LONG_PAGE_AVAIL (LONG_PAGE|'a')
#define LONG_MOUNTS ('m' << 8)
#define LONG_CREATE_MOUNTS (LONG_MOUNTS|'C')
#define LONG_CREATE_USER_MOUNTS (LONG_MOUNTS|'U')
#define LONG_CREATE_GROUP_MOUNTS (LONG_MOUNTS|'g')
#define LONG_CREATE_GLOBAL_MOUNTS (LONG_MOUNTS|'G')
#define LONG_LIST_ALL_MOUNTS (LONG_MOUNTS|'A')
#define LONG_LIMITS ('l' << 8)
#define LONG_LIMIT_SIZE (LONG_LIMITS|'S')
#define LONG_LIMIT_INODES (LONG_LIMITS|'I')
#define LONG_EXPLAIN ('e' << 8)
#define LONG_TRANS ('t' << 8)
#define LONG_TRANS_ALWAYS (LONG_TRANS|'a')
#define LONG_TRANS_MADVISE (LONG_TRANS|'m')
#define LONG_TRANS_NEVER (LONG_TRANS|'n')
#define LONG_KHUGE ('K' << 8)
#define LONG_KHUGE_PAGES (LONG_KHUGE|'p')
#define LONG_KHUGE_SCAN (LONG_KHUGE|'s')
#define LONG_KHUGE_ALLOC (LONG_KHUGE|'a')
#define MAX_POOLS 32
static int cmpsizes(const void *p1, const void *p2)
{
return ((struct hpage_pool *)p1)->pagesize >
((struct hpage_pool *)p2)->pagesize;
}
void pool_list(void)
{
struct hpage_pool pools[MAX_POOLS];
int pos;
int cnt;
cnt = hpool_sizes(pools, MAX_POOLS);
if (cnt < 0) {
ERROR("unable to obtain pools list");
exit(EXIT_FAILURE);
}
qsort(pools, cnt, sizeof(pools[0]), cmpsizes);
printf("%10s %8s %8s %8s %8s\n",
"Size", "Minimum", "Current", "Maximum", "Default");
for (pos = 0; cnt--; pos++) {
printf("%10ld %8ld %8ld %8ld %8s\n", pools[pos].pagesize,
pools[pos].minimum, pools[pos].size,
pools[pos].maximum, (pools[pos].is_default) ? "*" : "");
}
}
struct mount_list
{
struct mntent entry;
char data[MAX_SIZE_MNTENT];
struct mount_list *next;
};
void print_mounts(struct mount_list *current, int longest)
{
char format_str[FORMAT_LEN];
snprintf(format_str, FORMAT_LEN, "%%-%ds %%s\n", longest);
printf(format_str, "Mount Point", "Options");
while (current) {
printf(format_str, current->entry.mnt_dir,
current->entry.mnt_opts);
current = current->next;
}
}
/*
* collect_active_mounts returns a list of active hugetlbfs
* mount points, and, if longest is not NULL, the number of
* characters in the longest mount point to ease output
* formatting. Caller is expected to free the list of mounts.
*/
struct mount_list *collect_active_mounts(int *longest)
{
FILE *mounts;
struct mount_list *list, *current, *previous = NULL;
int length;
/* First try /proc/mounts, then /etc/mtab */
mounts = setmntent(PROCMOUNTS, "r");
if (!mounts) {
mounts = setmntent(MOUNTED, "r");
if (!mounts) {
ERROR("unable to open %s or %s for reading",
PROCMOUNTS, MOUNTED);
exit(EXIT_FAILURE);
}
}
list = malloc(sizeof(struct mount_list));
if (!list) {
ERROR("out of memory");
exit(EXIT_FAILURE);
}
list->next = NULL;
current = list;
while (getmntent_r(mounts, &(current->entry), current->data, MAX_SIZE_MNTENT)) {
if (strcasecmp(current->entry.mnt_type, FS_NAME) == 0) {
length = strlen(current->entry.mnt_dir);
if (longest && length > *longest)
*longest = length;
current->next = malloc(sizeof(struct mount_list));
if (!current->next) {
ERROR("out of memory");
exit(EXIT_FAILURE);
}
previous = current;
current = current->next;
current->next = NULL;
}
}
endmntent(mounts);
if (previous) {
free(previous->next);
previous->next = NULL;
return list;
}
return NULL;
}
void mounts_list_all(void)
{
struct mount_list *list, *previous;
int longest = MIN_COL;
list = collect_active_mounts(&longest);
if (!list) {
ERROR("No hugetlbfs mount points found\n");
return;
}
print_mounts(list, longest);
while (list) {
previous = list;
list = list->next;
free(previous);
}
}
int make_dir(char *path, mode_t mode, uid_t uid, gid_t gid)
{
struct passwd *pwd;
struct group *grp;
if (opt_dry_run) {
pwd = getpwuid(uid);
grp = getgrgid(gid);
printf("if [ ! -e %s ]\n", path);
printf("then\n");
printf(" mkdir %s\n", path);
printf(" chown %s:%s %s\n", pwd->pw_name, grp->gr_name, path);
printf(" chmod %o %s\n", mode, path);
printf("fi\n");
return 0;
}
if (mkdir(path, mode)) {
if (errno != EEXIST) {
ERROR("Unable to create dir %s, error: %s\n",
path, strerror(errno));
return 1;
}
} else {
if (chown(path, uid, gid)) {
ERROR("Unable to change ownership of %s, error: %s\n",
path, strerror(errno));
return 1;
}
if (chmod(path, mode)) {
ERROR("Unable to change permission on %s, error: %s\n",
path, strerror(errno));
return 1;
}
}
return 0;
}
/**
* ensure_dir will build the entire directory structure up to and
* including path, all directories built will be owned by
* user:group and permissions will be set to mode.
*/
int ensure_dir(char *path, mode_t mode, uid_t uid, gid_t gid)
{
char *idx;
if (!path || strlen(path) == 0)
return 0;
idx = strchr(path + 1, '/');
do {
if (idx)
*idx = '\0';
if (make_dir(path, mode, uid, gid))
return 1;
if (idx) {
*idx = '/';
idx++;
}
} while ((idx = strchr(idx, '/')) != NULL);
if (make_dir(path, mode, uid, gid))
return 1;
return 0;
}
int check_if_already_mounted(struct mount_list *list, char *path)
{
while (list) {
if (!strcmp(list->entry.mnt_dir, path))
return 1;
list = list->next;
}
return 0;
}
int mount_dir(char *path, char *options, mode_t mode, uid_t uid, gid_t gid)
{
struct passwd *pwd;
struct group *grp;
struct mntent entry;
FILE *mounts;
char dummy;
int useMtab;
struct mount_list *list, *previous;
list = collect_active_mounts(NULL);
if (list && check_if_already_mounted(list, path)) {
WARNING("Directory %s is already mounted.\n", path);
while (list) {
previous = list;
list = list->next;
free(previous);
}
return 0;
}
while (list) {
previous = list;
list = list->next;
free(previous);
}
if (opt_dry_run) {
pwd = getpwuid(uid);
grp = getgrgid(gid);
printf("mount -t %s none %s -o %s\n", FS_NAME,
path, options);
printf("chown %s:%s %s\n", pwd->pw_name, grp->gr_name,
path);
printf("chmod %o %s\n", mode, path);
} else {
if (mount("none", path, FS_NAME, 0, options)) {
ERROR("Unable to mount %s, error: %s\n",
path, strerror(errno));
return 1;
}
/* Check if mtab is a symlink */
useMtab = (readlink(MOUNTED, &dummy, 1) < 0);
if (useMtab) {
mounts = setmntent(MOUNTED, "a+");
if (mounts) {
entry.mnt_fsname = FS_NAME;
entry.mnt_dir = path;
entry.mnt_type = FS_NAME;
entry.mnt_opts = options;
entry.mnt_freq = 0;
entry.mnt_passno = 0;
if (addmntent(mounts, &entry))
WARNING("Unable to add entry %s to %s, error: %s\n",
path, MOUNTED, strerror(errno));
endmntent(mounts);
} else {
WARNING("Unable to open %s, error: %s\n",
MOUNTED, strerror(errno));
}
}
if (chown(path, uid, gid)) {
ERROR("Unable to change ownership of %s, error: %s\n",
path, strerror(errno));
return 1;
}
if (chmod(path, mode)) {
ERROR("Unable to set permissions on %s, error: %s\n",
path, strerror(errno));
return 1;
}
}
return 0;
}
void scale_size(char *buf, unsigned long pagesize)
{
if(pagesize >= GB)
snprintf(buf, OPT_MAX, "%luGB", pagesize / GB);
else if(pagesize >= MB)
snprintf(buf, OPT_MAX, "%luMB", pagesize / MB);
else
snprintf(buf, OPT_MAX, "%luKB", pagesize / KB);
}
void create_mounts(char *user, char *group, char *base, mode_t mode)
{
struct hpage_pool pools[MAX_POOLS];
char path[PATH_MAX];
char options[OPT_MAX];
char limits[OPT_MAX];
char scaled[OPT_MAX];
int cnt, pos;
struct passwd *pwd;
struct group *grp;
uid_t uid = 0;
gid_t gid = 0;
if (geteuid() != 0) {
ERROR("Mounts can only be created by root\n");
exit(EXIT_FAILURE);
}
if (user) {
pwd = getpwnam(user);
if (!pwd) {
ERROR("Could not find specified user %s\n", user);
exit(EXIT_FAILURE);
}
uid = pwd->pw_uid;
} else if (group) {
grp = getgrnam(group);
if (!grp) {
ERROR("Could not find specified group %s\n", group);
exit(EXIT_FAILURE);
}
gid = grp->gr_gid;
}
if (ensure_dir(base,
S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH, 0, 0))
exit(EXIT_FAILURE);
cnt = hpool_sizes(pools, MAX_POOLS);
if (cnt < 0) {
ERROR("Unable to obtain pools list\n");
exit(EXIT_FAILURE);
}
for (pos=0; cnt--; pos++) {
scaled[0] = 0;
scale_size(scaled, pools[pos].pagesize);
if (user)
snprintf(path, PATH_MAX, "%s/%s/pagesize-%s",
base, user, scaled);
else if (group)
snprintf(path, PATH_MAX, "%s/%s/pagesize-%s",
base, group, scaled);
else
snprintf(path, PATH_MAX, "%s/pagesize-%s",
base, scaled);
snprintf(options, OPT_MAX, "pagesize=%ld",
pools[pos].pagesize);
/* Yes, this could be cleverer */
if (opt_limit_mount_size && opt_limit_mount_inodes)
snprintf(limits, OPT_MAX, ",size=%lu,nr_inodes=%d",
opt_limit_mount_size, opt_limit_mount_inodes);
else {
if (opt_limit_mount_size)
snprintf(limits, OPT_MAX, ",size=%lu",
opt_limit_mount_size);
if (opt_limit_mount_inodes)
snprintf(limits, OPT_MAX, ",nr_inodes=%d",
opt_limit_mount_inodes);
}
/* Append limits if specified */
if (limits[0] != 0) {
size_t maxlen = OPT_MAX - strlen(options);
if (maxlen > strlen(limits))
strcat(options, limits);
else
WARNING("String limitations met, cannot append limitations onto mount options string. Increase OPT_MAX");
}
if (ensure_dir(path, mode, uid, gid))
exit(EXIT_FAILURE);
if (mount_dir(path, options, mode, uid, gid))
exit(EXIT_FAILURE);
}
}
/**
* show_mem shouldn't change the behavior of any of its
* callers, it only prints a message to the user showing the
* total amount of memory in the system (in megabytes).
*/
void show_mem()
{
long mem_total;
mem_total = read_meminfo(MEM_TOTAL);
printf("Total System Memory: %ld MB\n\n", mem_total / 1024);
}
/**
* check_swap shouldn't change the behavior of any of its
* callers, it only prints a message to the user if something
* is being done that might fail without swap available. i.e.
* resizing a huge page pool
*/
void check_swap()
{
long swap_sz;
long swap_total;
swap_total = read_meminfo(SWAP_TOTAL);
if (swap_total <= 0) {
WARNING("There is no swap space configured, resizing hugepage pool may fail\n");
WARNING("Use --add-temp-swap option to temporarily add swap during the resize\n");
return;
}
swap_sz = read_meminfo(SWAP_FREE);
/* meminfo keeps values in kb, but we use bytes for hpage sizes */
swap_sz *= 1024;
if (swap_sz <= gethugepagesize()) {
WARNING("There is very little swap space free, resizing hugepage pool may fail\n");
WARNING("Use --add-temp-swap option to temporarily add swap during the resize\n");
}
}
#define ZONEINFO_LINEBUF 1024
long recommended_minfreekbytes(void)
{
FILE *f;
char buf[ZONEINFO_LINEBUF];
int nr_zones = 0;
long recommended_min;
long pageblock_kbytes = kernel_default_hugepage_size() / 1024;
/* Detect the number of zones in the system */
f = fopen(PROCZONEINFO, "r");
if (f == NULL) {
WARNING("Unable to open " PROCZONEINFO);
return 0;
}
while (fgets(buf, ZONEINFO_LINEBUF, f) != NULL) {
if (strncmp(buf, "Node ", 5) == 0)
nr_zones++;
}
fclose(f);
/* Make sure at least 2 pageblocks are free for MIGRATE_RESERVE */
recommended_min = pageblock_kbytes * nr_zones * 2;
/*
* Make sure that on average at least two pageblocks are almost free
* of another type, one for a migratetype to fall back to and a
* second to avoid subsequent fallbacks of other types There are 3
* MIGRATE_TYPES we care about.
*/
recommended_min += pageblock_kbytes * nr_zones * 3 * 3;
return recommended_min;
}
void set_recommended_minfreekbytes(void)
{
long recommended_min = recommended_minfreekbytes();
if (opt_dry_run) {
printf("echo \"%ld\" > %s\n", recommended_min,
PROCMINFREEKBYTES);
return;
}
DEBUG("Setting min_free_kbytes to %ld\n", recommended_min);
file_write_ulong(PROCMINFREEKBYTES, (unsigned long)recommended_min);
}
/*
* check_minfreekbytes does not alter the value of min_free_kbytes. It just
* reports what the current value is and what it should be
*/
void check_minfreekbytes(void)
{
long min_free_kbytes = file_read_ulong(PROCMINFREEKBYTES, NULL);
long recommended_min = recommended_minfreekbytes();
/* There should be at least one pageblock free per zone in the system */
if (recommended_min > min_free_kbytes) {
printf("\n");
printf("The " PROCMINFREEKBYTES " of %ld is too small. To maximiuse efficiency\n", min_free_kbytes);
printf("of fragmentation avoidance, there should be at least one huge page free per zone\n");
printf("in the system which minimally requires a min_free_kbytes value of %ld\n", recommended_min);
}
}
unsigned long long recommended_shmmax(void)
{
struct hpage_pool pools[MAX_POOLS];
unsigned long long recommended_shmmax = 0;
int pos, cnt;
cnt = hpool_sizes(pools, MAX_POOLS);
if (cnt < 0) {
ERROR("unable to obtain pools list");
exit(EXIT_FAILURE);
}
for (pos = 0; cnt--; pos++)
recommended_shmmax += ((unsigned long long)pools[pos].maximum *
pools[pos].pagesize);
return recommended_shmmax;
}
void set_recommended_shmmax(void)
{
int ret;
unsigned long max_recommended = -1UL;
unsigned long long recommended = recommended_shmmax();
if (recommended == 0) {
printf("\n");
WARNING("We can only set a recommended shmmax when huge pages are configured!\n");
return;
}
if (recommended > max_recommended)
recommended = max_recommended;
DEBUG("Setting shmmax to %llu\n", recommended);
ret = file_write_ulong(PROCSHMMAX, (unsigned long)recommended);
if (!ret) {
INFO("To make shmmax settings persistent, add the following line to /etc/sysctl.conf:\n");
INFO(" kernel.shmmax = %llu\n", recommended);
}
}
void check_shmmax(void)
{
long current_shmmax = file_read_ulong(PROCSHMMAX, NULL);
long recommended = recommended_shmmax();
if (current_shmmax != recommended) {
printf("\n");
printf("A " PROCSHMMAX " value of %ld bytes may be sub-optimal. To maximise\n", current_shmmax);
printf("shared memory usage, this should be set to the size of the largest shared memory\n");
printf("segment size you want to be able to use. Alternatively, set it to a size matching\n");
printf("the maximum possible allocation size of all huge pages. This can be done\n");
printf("automatically, using the --set-recommended-shmmax option.\n");
}
if (recommended == 0) {
printf("\n");
WARNING("We can't make a shmmax recommendation until huge pages are configured!\n");
return;
}
printf("\n");
printf("The recommended shmmax for your currently allocated huge pages is %ld bytes.\n", recommended);
printf("To make shmmax settings persistent, add the following line to /etc/sysctl.conf:\n");
printf(" kernel.shmmax = %ld\n", recommended);
}
void set_hugetlb_shm_group(gid_t gid, char *group)
{
int ret;
DEBUG("Setting hugetlb_shm_group to %d (%s)\n", gid, group);
ret = file_write_ulong(PROCHUGETLBGROUP, (unsigned long)gid);
if (!ret) {
INFO("To make hugetlb_shm_group settings persistent, add the following line to /etc/sysctl.conf:\n");
INFO(" vm.hugetlb_shm_group = %d\n", gid);
}
}
/* heisted from shadow-utils/libmisc/list.c::is_on_list() */
static int user_in_group(char *const *list, const char *member)
{
while (*list != NULL) {
if (strcmp(*list, member) == 0) {
return 1;
}
list++;
}
return 0;
}
void check_user(void)
{
uid_t uid;
gid_t gid;
struct passwd *pwd;
struct group *grp;
gid = (gid_t)file_read_ulong(PROCHUGETLBGROUP, NULL);
grp = getgrgid(gid);
if (!grp) {
printf("\n");
WARNING("Group ID %d in hugetlb_shm_group doesn't appear to be a valid group!\n", gid);
return;
}
uid = getuid();
pwd = getpwuid(uid);
/* Don't segfault if user does not have a passwd entry. */
if (!pwd) {
printf("\n");
WARNING("User uid %d is not in the password file!\n", uid);
return;
}
if (gid != pwd->pw_gid && !user_in_group(grp->gr_mem, pwd->pw_name) && uid != 0) {
printf("\n");
WARNING("User %s (uid: %d) is not a member of the hugetlb_shm_group %s (gid: %d)!\n", pwd->pw_name, uid, grp->gr_name, gid);
} else {
printf("\n");
printf("To make your hugetlb_shm_group settings persistent, add the following line to /etc/sysctl.conf:\n");
printf(" vm.hugetlb_shm_group = %d\n", gid);
}
}
void add_temp_swap(long page_size)
{
char path[PATH_MAX];
char file[PATH_MAX];
char mkswap_cmd[PATH_MAX];
FILE *f;
char *buf;
long swap_size;
long pid;
int ret;
int num_pages;
if (geteuid() != 0) {
ERROR("Swap can only be manipulated by root\n");
exit(EXIT_FAILURE);
}
pid = getpid();
snprintf(path, PATH_MAX, "%s/swap/temp", MOUNT_DIR);
snprintf(file, PATH_MAX, "%s/swapfile-%ld", path, pid);
/* swapsize is 5 hugepages */
if (opt_temp_swap == -1)
num_pages = 5;
else
num_pages = opt_temp_swap;
swap_size = num_pages * page_size;
if (ensure_dir(path, S_IRWXU | S_IRGRP | S_IXGRP, 0, 0))
exit(EXIT_FAILURE);
if (opt_dry_run) {
printf("dd bs=1024 count=%ld if=/dev/zero of=%s\n",
swap_size / 1024, file);
printf("mkswap %s\nswapon %s\n", file, file);
return;
}
f = fopen(file, "wx");
if (!f) {
WARNING("Couldn't open %s: %s\n", file, strerror(errno));
opt_temp_swap = 0;
return;
}
buf = malloc(swap_size);
memset(buf, 0, swap_size);
fwrite(buf, sizeof(char), swap_size, f);
free(buf);
fclose(f);
snprintf(mkswap_cmd, PATH_MAX, "mkswap %s", file);
ret = system(mkswap_cmd);
if (WIFSIGNALED(ret)) {
WARNING("Call to mkswap failed\n");
opt_temp_swap = 0;
return;
} else if (WIFEXITED(ret)) {
ret = WEXITSTATUS(ret);
if (ret) {
WARNING("Call to mkswap failed\n");
opt_temp_swap = 0;
return;
}
}
DEBUG("swapon %s\n", file);
if (swapon(file, 0)) {
WARNING("swapon on %s failed: %s\n", file, strerror(errno));
opt_temp_swap = 0;
}