adb shell进去后
cat /sys/kernel/debug/dma_buf/bufinfo |grep -iE "Total.* bytes"
示例：
google:/sys/kernel/debug/ion/ion_system_heap # google:/sys/kernel/debug/ion/ion_system_heap # cat num_of_alloc_bytes 45232128
如果要查看每个进程的ION用量，请参阅：Android系统中如何查看当前系统ION内存用量