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Message-ID: <F185F1F1FF284307ABD7BA74DB4747D1@rainbow>
From: "Iram Shahzad" <iram.shahzad@jp.fujitsu.com>
References: <325E0A25FE724BA18190186F058FF37E@rainbow> <20100817111018.GQ19797@csn.ul.ie> <4385155269B445AEAF27DC8639A953D7@rainbow> <20100818154130.GC9431@localhost> <565A4EE71DAC4B1A820B2748F56ABF73@rainbow> <20100819074602.GW19797@csn.ul.ie> <5EF4FA9117384B1A80228C96926B4125@rainbow> <20100820055006.GA13916@localhost>
Subject: Re: compaction: trying to understand the code
Date: Fri, 20 Aug 2010 15:13:33 +0900
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To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Mel Gorman <mel@csn.ul.ie>, linux-mm@kvack.org, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Ying Han <yinghan@google.com>
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> That's all? Is you system idle otherwise? (for example, fresh booted
> and not running many processes)

Sorry, I didn't mean that. There are other processes running.
I just meant my test doesn't do anything else.

> We are interested in the test app, can you share it? :)

Attached.

Thanks
Iram

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	filename="mfragprog.c"

#include <stdlib.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <asm/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>

#define TRYNUMMAX (1024*50)
static void *p[TRYNUMMAX] =3D {(void *)1, };
static size_t size;
static int trynum;

static void mfrag(void)
{
	int i;

	fprintf(stderr, "size, trynum: %d %d\n", size, trynum);

	for (i=3D0; i<trynum; i++) {
			p[i] =3D NULL;
	}

	for (i=3D0; i<trynum; i++) {
		p[i] =3D malloc(size);
		if (p[i]) {
			fprintf(stderr, "(%s:%s:%d) Success %d %d %p\n", __FILE__, =
__FUNCTION__, __LINE__, size, i, p[i]);
			memset(p[i], 'a', size);
		}
		else {
			fprintf(stderr, "(%s:%s:%d) Fail %d %d\n", __FILE__, __FUNCTION__, =
__LINE__, size, i);
			break;
		}
	}

	fprintf(stderr, "%d allocs done\n", i);

	for (i=3D0; i<trynum; i+=3D2) {
		if (p[i]) {
			free(p[i]);
			p[i] =3D NULL;
		}
	}

	fprintf(stderr, "frag done\n");
}

int main (int argc, char **argv)
{
	if (argc !=3D 3) {
		fprintf(stderr, "usage: %s <size> <trynum>\n", argv[0]);
		exit(1);
	}

	size =3D atoi(argv[1]);
	trynum =3D atoi(argv[2]);
	if (trynum > TRYNUMMAX) {
		trynum =3D TRYNUMMAX;
	}
=09
	mfrag();
=09
	while (1) {
		fprintf(stdout, "(%s:%s:%d)\n", __FILE__, __FUNCTION__, __LINE__);
		sleep(3);
	}
}

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