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why we need ion instad of pmem?

5th January 2014, 04:37 AM |#1  
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Android ION overview
ION is the memory manager of Android, it could be used by graphic and multimedia stacks to allocate buffers.
ION include a buffer sharing mechanism between process and drivers.
ION define opaque handles to manage underline buffers.
ION handles are only map in kernel if that is needed by drivers, it help to save logical address space.
In a same way ION handles aren't mmaped by default in userland but all helpers functions are provided.

i cant understand the things?
why need ion instad of pmem?
can some1 tell?
5th January 2014, 05:15 AM |#2  
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ION is a new,unified memory allocator. Simple term: Make thing faster.
Newer driver now build for ION instead of PMEM. That's why ION is needed.
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5th January 2014, 02:41 PM |#3  
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nice and clear
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