tools/vm/page_owner_sort.c: two trivial fixes

1) There is an unused variable. It's better to delete it.
2) One case is missing in the usage().

Link: https://lkml.kernel.org/r/20211213164518.2461-1-hanshenghong2019@email.szu.edu.cn
Signed-off-by: Shenghong Han <hanshenghong2019@email.szu.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/tools/vm/page_owner_sort.c b/tools/vm/page_owner_sort.c
index c9fedc1..284a507 100644 (file)
--- a/tools/vm/page_owner_sort.c
+++ b/tools/vm/page_owner_sort.c
@@ -41,8 +41,6 @@ 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;
@@ -249,7 +247,8 @@ static void usage(void)
                "-p     Sort by pid.\n"
                "-a     Sort by memory allocate time.\n"
                "-r     Sort by memory release time.\n"
-               "-c     cull by comparing stacktrace instead of total block.\n"
+               "-c     Cull by comparing stacktrace instead of total block.\n"
+               "-f     Filter out the information of blocks whose memory has not been released.\n"
        );
 }