Commit 82f5ebc2 authored by Sean Anderson's avatar Sean Anderson Committed by Linus Torvalds
Browse files

tools/vm/page_owner_sort.c: support sorting by stack trace 

This adds the ability to sort by stacktraces.  This is helpful when
comparing multiple dumps of page_owner taken at different times, since
blocks will not be reordered if they were allocated/free'd.

Link: https://lkml.kernel.org/r/20211124193709.1805776-2-seanga2@gmail.com


Signed-off-by: default avatarSean Anderson <seanga2@gmail.com>
Cc: Zhenliang Wei <weizhenliang@huawei.com>
Cc: Changhee Han <ch0.han@lge.com>
Cc: Tang Bin <tangbin@cmss.chinamobile.com>
Cc: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Yinan Zhang <zhangyinan2019@email.szu.edu.cn>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ba5a396b

tools/vm/page_owner_sort.c

+14 −9
Original line number Diff line number Diff line
@@ -29,7 +29,6 @@ struct block_list { 
	int page_num;

};



static int sort_by_memory;

static regex_t order_pattern;

static struct block_list *list;

static int list_size;
@@ -134,13 +133,16 @@ static void add_list(char *buf, int len) 


static void usage(void)

{

	printf("Usage: ./page_owner_sort [-m] <input> <output>\n"

		"-m	Sort by total memory. If this option is unset, sort by times\n"

	printf("Usage: ./page_owner_sort [OPTIONS] <input> <output>\n"

		"-m	Sort by total memory.\n"

		"-s	Sort by the stack trace.\n"

		"-t	Sort by times (default).\n"

	);

}



int main(int argc, char **argv)

{

	int (*cmp)(const void *, const void *) = compare_num;

	FILE *fin, *fout;

	char *buf;

	int ret, i, count;
@@ -149,10 +151,16 @@ int main(int argc, char **argv) 
	int err;

	int opt;



	while ((opt = getopt(argc, argv, "m")) != -1)

	while ((opt = getopt(argc, argv, "mst")) != -1)

		switch (opt) {

		case 'm':

			sort_by_memory = 1;

			cmp = compare_page_num;

			break;

		case 's':

			cmp = compare_stacktrace;

			break;

		case 't':

			cmp = compare_num;

			break;

		default:

			usage();
@@ -221,10 +229,7 @@ int main(int argc, char **argv) 
		}

	}



	if (sort_by_memory)

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

	else

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

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



	for (i = 0; i < count; i++)

		fprintf(fout, "%d times, %d pages:\n%s\n",