Usage: 1. CONFIG_FS_PROCFS_MAX_STACK_RECORD > 0, such as 32, 2. add '-finstrument-functions' to CFLAGS for What you want to check stack. 3. mount porcfs 4. cat /proc/<pid>/stack will print backtace & size Signed-off-by: anjiahao <anjiahao@xiaomi.com>