本文介绍了如何通过/sys/kernel/debug/ion/heaps来查看系统中各进程的ION内存使用情况，包括分配给surfaceflinger、fb等客户端的内存大小及孤儿分配信息，并展示了如何检查特定进程对缓冲区的引用。
1.查看各个进程的ION
:/sys/kernel/debug/ion/heaps # cat system-heap
cat system-heap
client pid size
----------------------------------------------------
surfaceflinger 211 6565888
surfaceflinger 211 50413568
fb 1 32538624
----------------------------------------------------
orphaned allocations (info is from last known client):
surfaceflinger 211 7864320 0 1
----------------------------------------------------
total orphaned 7864320
total 90009600
deferred free 0
----------------------------------------------------
0 order 8 highmem pages in pool = 0 total
27 order 8 lowmem pages in pool = 28311552 total
0 order 4 highmem pages in pool = 0 total
8 order 4 lowmem pages in pool = 524288 total
0 order 0 highmem pages in pool = 0 total
4 order 0 lowmem pages in pool = 16384 total
2.每个进程对这个buffer的引用情况：
cat /proc/进程号/fd
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