/*
 * User-space helper to sort the output of /sys/kernel/debug/page_owner
 *
 * Example use:
 * cat /sys/kernel/debug/page_owner > page_owner_full.txt
 * grep -v ^PFN page_owner_full.txt > page_owner.txt
 * ./sort page_owner.txt sorted_page_owner.txt
*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

struct block_list {
	char *txt;
	int len;
	int num;
};


static struct block_list *list;
static int list_size;
static int max_size;

struct block_list *block_head;

int read_block(char *buf, int buf_size, FILE *fin)
{
	char *curr = buf, *const buf_end = buf + buf_size;

	while (buf_end - curr > 1 && fgets(curr, buf_end - curr, fin)) {
		if (*curr == '\n') /* empty line */
			return curr - buf;
		curr += strlen(curr);
	}

	return -1; /* EOF or no space left in buf. */
}

static int compare_txt(const void *p1, const void *p2)
{
	const struct block_list *l1 = p1, *l2 = p2;

	return strcmp(l1->txt, l2->txt);
}

static int compare_num(const void *p1, const void *p2)
{
	const struct block_list *l1 = p1, *l2 = p2;

	return l2->num - l1->num;
}

static void add_list(char *buf, int len)
{
	if (list_size != 0 &&
	    len == list[list_size-1].len &&
	    memcmp(buf, list[list_size-1].txt, len) == 0) {
		list[list_size-1].num++;
		return;
	}
	if (list_size == max_size) {
		printf("max_size too small??\n");
		exit(1);
	}
	list[list_size].txt = malloc(len+1);
	list[list_size].len = len;
	list[list_size].num = 1;
	memcpy(list[list_size].txt, buf, len);
	list[list_size].txt[len] = 0;
	list_size++;
	if (list_size % 1000 == 0) {
		printf("loaded %d\r", list_size);
		fflush(stdout);
	}
}

#define BUF_SIZE	(128 * 1024)

int main(int argc, char **argv)
{
	FILE *fin, *fout;
	char *buf;
	int ret, i, count;
	struct block_list *list2;
	struct stat st;

	if (argc < 3) {
		printf("Usage: ./program <input> <output>\n");
		perror("open: ");
		exit(1);
	}

	fin = fopen(argv[1], "r");
	fout = fopen(argv[2], "w");
	if (!fin || !fout) {
		printf("Usage: ./program <input> <output>\n");
		perror("open: ");
		exit(1);
	}

	fstat(fileno(fin), &st);
	max_size = st.st_size / 100; /* hack ... */

	list = malloc(max_size * sizeof(*list));
	buf = malloc(BUF_SIZE);
	if (!list || !buf) {
		printf("Out of memory\n");
		exit(1);
	}

	for ( ; ; ) {
		ret = read_block(buf, BUF_SIZE, fin);
		if (ret < 0)
			break;

		add_list(buf, ret);
	}

	printf("loaded %d\n", list_size);

	printf("sorting ....\n");

	qsort(list, list_size, sizeof(list[0]), compare_txt);

	list2 = malloc(sizeof(*list) * list_size);

	printf("culling\n");

	for (i = count = 0; i < list_size; i++) {
		if (count == 0 ||
		    strcmp(list2[count-1].txt, list[i].txt) != 0) {
			list2[count++] = list[i];
		} else {
			list2[count-1].num += list[i].num;
		}
	}

	qsort(list2, count, sizeof(list[0]), compare_num);

	for (i = 0; i < count; i++)
		fprintf(fout, "%d times:\n%s\n", list2[i].num, list2[i].txt);

	return 0;
}
ff/tools?id=3efa70d78f218e4c9276b0bac0545e5184c1c47b&amp;id2=76e0e70e6452b971a69cc9794ff4a6715c11f7f2'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/diff/tools/arch?id=3efa70d78f218e4c9276b0bac0545e5184c1c47b&amp;id2=76e0e70e6452b971a69cc9794ff4a6715c11f7f2'>arch</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='3efa70d78f218e4c9276b0bac0545e5184c1c47b'/><input type='hidden' name='id2' value='76e0e70e6452b971a69cc9794ff4a6715c11f7f2'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=3efa70d78f218e4c9276b0bac0545e5184c1c47b&amp;id2=76e0e70e6452b971a69cc9794ff4a6715c11f7f2'>Diffstat</a> (limited to 'tools/arch')</div><table summary='diffstat' class='diffstat'>