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/* Copyright (C) 2003,2004 Andi Kleen, SuSE Labs.
Allocate memory with policy for testing.
numactl 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; version
2.
numactl 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 find a copy of v2 of the GNU General Public License somewhere
on your Linux system; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include <stdbool.h>
#include "numa.h"
#include "numaif.h"
#include "util.h"
#define terr(x) perror(x)
enum {
UNIT = 10*1024*1024,
};
#ifndef MADV_NOHUGEPAGE
#define MADV_NOHUGEPAGE 15
#endif
static void usage(void)
{
printf("memhog [-fFILE] [-rNUM] [-H] size[kmg] [policy [nodeset]]\n");
printf("-f mmap is backed by FILE\n");
printf("-rNUM repeat memset NUM times\n");
printf("-H disable transparent hugepages\n");
print_policies();
exit(1);
}
long length;
static void hog(void *map)
{
long i;
for (i = 0; i < length; i += UNIT) {
long left = length - i;
if (left > UNIT)
left = UNIT;
putchar('.');
fflush(stdout);
memset(map + i, 0xff, left);
}
putchar('\n');
}
int main(int ac, char **av)
{
char *map;
struct bitmask *nodes, *gnodes;
int policy, gpolicy;
int ret = 0;
int loose = 0;
int i;
int fd = -1;
bool disable_hugepage = false;
int repeat = 1;
nodes = numa_allocate_nodemask();
gnodes = numa_allocate_nodemask();
while (av[1] && av[1][0] == '-') {
switch (av[1][1]) {
case 'f':
fd = open(av[1]+2, O_RDWR);
if (fd < 0)
perror(av[1]+2);
break;
case 'r':
repeat = atoi(av[1] + 2);
break;
case 'H':
disable_hugepage = true;
break;
default:
usage();
}
av++;
}
if (!av[1]) usage();
length = memsize(av[1]);
if (av[2] && numa_available() < 0) {
printf("Kernel doesn't support NUMA policy\n");
} else
loose = 1;
policy = parse_policy(av[2], av[3]);
if (policy == MPOL_MAX)
usage();
if (policy != MPOL_DEFAULT && policy != MPOL_LOCAL)
nodes = numa_parse_nodestring(av[3]);
if (!nodes) {
printf ("<%s> is invalid\n", av[3]);
exit(1);
}
if (fd >= 0)
map = mmap(NULL,length,PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
else
map = mmap(NULL, length, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS,
0, 0);
if (map == (char*)-1)
err("mmap");
if (mbind(map, length, policy, nodes->maskp, nodes->size, 0) < 0)
terr("mbind");
if (disable_hugepage)
madvise(map, length, MADV_NOHUGEPAGE);
gpolicy = -1;
if (get_mempolicy(&gpolicy, gnodes->maskp, gnodes->size, map, MPOL_F_ADDR) < 0)
terr("get_mempolicy");
if (!loose && policy != gpolicy) {
ret = 1;
printf("policy %d gpolicy %d\n", policy, gpolicy);
}
if (!loose && !numa_bitmask_equal(gnodes, nodes)) {
printf("nodes differ %lx, %lx!\n",
gnodes->maskp[0], nodes->maskp[0]);
ret = 1;
}
for (i = 0; i < repeat; i++)
hog(map);
exit(ret);
}
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