1packet {
2  ftrace_events {
3    cpu: 0
4    event {
5      timestamp: 100
6      pid: 1
7      dma_heap_stat {
8        inode: 123
9        len: 1024
10        total_allocated: 2048
11      }
12    }
13  }
14}
15packet {
16  ftrace_events {
17    cpu: 0
18    event {
19      timestamp: 200
20      pid: 1
21      dma_heap_stat {
22        inode: 123
23        len: -1024
24        total_allocated: 1024
25      }
26    }
27  }
28}
29