From: Sean Anderson <seanga2@xxxxxxxxx> Subject: 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@xxxxxxxxx Signed-off-by: Sean Anderson <seanga2@xxxxxxxxx> Cc: Zhenliang Wei <weizhenliang@xxxxxxxxxx> Cc: Changhee Han <ch0.han@xxxxxxx> Cc: Tang Bin <tangbin@xxxxxxxxxxxxxxxxxxxx> Cc: Zhang Shengju <zhangshengju@xxxxxxxxxxxxxxxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Cc: Yinan Zhang <zhangyinan2019@xxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- tools/vm/page_owner_sort.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) --- a/tools/vm/page_owner_sort.c~tools-vm-page_owner_sortc-support-sorting-by-stack-trace +++ a/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", _
