[PATCH v2 2/2] tools/vm/page_owner_sort.c: Support sorting by stack trace

From: Sean Anderson
Date: Wed Nov 24 2021 - 14:37:20 EST


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.

Signed-off-by: Sean Anderson <seanga2@xxxxxxxxx>
---

Changes in v2:
- Fix truncated commit message (oops)

tools/vm/page_owner_sort.c | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/tools/vm/page_owner_sort.c b/tools/vm/page_owner_sort.c
index 9ad3772a294d..b91d3381300c 100644
--- a/tools/vm/page_owner_sort.c
+++ b/tools/vm/page_owner_sort.c
@@ -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",
--
2.33.0