linux-kernel - Re: [patch] rfc: introduce /dev/hugetlb

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Date:	Fri, 23 Mar 2007 14:56:07 -0700
From:	"Ken Chen" <kenchen@...gle.com>
To:	"William Lee Irwin III" <wli@...omorphy.com>
Cc:	"Adam Litke" <agl@...ibm.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Arjan van de Ven" <arjan@...radead.org>,
	"Christoph Hellwig" <hch@...radead.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] rfc: introduce /dev/hugetlb

On 3/23/07, William Lee Irwin III <wli@...omorphy.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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