On Fri, Dec 07, 2012 at 04:24:17PM -0500, Dave Hansen wrote:
>
> diff -puN /dev/null Documentation/page_owner.c
Can we stop putting code into Documentation? We have tools, samples and
usr directories. I'm sure this could fit into one of them.
-- Steve
> --- /dev/null 2012-06-13 15:09:09.708529931 -0400
> +++ linux-2.6.git-dave/Documentation/page_owner.c 2012-12-07 16:22:43.872270758 -0500
> @@ -0,0 +1,141 @@
> +/*
> + * 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, FILE *fin)
> +{
> + int ret = 0;
> + int hit = 0;
> + char *curr = buf;
> +
> + for (;;) {
> + *curr = getc(fin);
> + if (*curr == EOF) return -1;
> +
> + ret++;
> + if (*curr == '\n' && hit == 1)
> + return ret - 1;
> + else if (*curr == '\n')
> + hit = 1;
> + else
> + hit = 0;
> + curr++;
> + }
> +}
> +
> +static int compare_txt(struct block_list *l1, struct block_list *l2)
> +{
> + return strcmp(l1->txt, l2->txt);
> +}
> +
> +static int compare_num(struct block_list *l1, struct block_list *l2)
> +{
> + 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);
> + }
> +}
> +
> +int main(int argc, char **argv)
> +{
> + FILE *fin, *fout;
> + char buf[1024];
> + int ret, i, count;
> + struct block_list *list2;
> + struct stat st;
> +
> + fin = fopen(argv[1], "r");
> + fout = fopen(argv[2], "w");
> + if (!fin || !fout) {
> + printf("Usage: ./program <input> <output>\n");
> + perror("open: ");
> + exit(2);
> + }
> +
> + fstat(fileno(fin), &st);
> + max_size = st.st_size / 100; /* hack ... */
> +
> + list = malloc(max_size * sizeof(*list));
> +
> + for(;;) {
> + ret = read_block(buf, fin);
> + if (ret < 0)
> + break;
> +
> + buf[ret] = '\0';
> + 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;
> +}
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