Re: [patch] rfc: introduce /dev/hugetlb

["Ken Chen" <kenchen@google.com>]

On 3/23/07, William Lee Irwin III <wli@holomorphy.com> wrote:
> I like this patch a lot, though I'm not likely to get around to testing
> it today. If userspace testcode is available that would be great to see
> posted so I can just boot into things and run that.

Here is the test code that I used:
(warning: x86 centric)

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>

#define SIZE	(4*1024*1024UL)

int main(void)
{
	int fd;
	long i;
	char *addr;

	fd = open("/dev/hugetlb", O_RDWR);
	if (fd == -1) {
		perror("open failure");
		exit(1);
	}

	addr = mmap(0, SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
	if (addr == MAP_FAILED) {
		perror("mmap failure");
		exit(2);
	}

	for (i = 0; i < SIZE; i+=4096)
		addr[i] = 1;

	printf("success!\n");
}

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