How much physically contiguous memory is required for 2D?

There is the following comment in libs/surfaceflinger/VRamHeap.cpp

/*
 * Amount of memory we reserve for surface, per client in PMEM
 * (PMEM is used for 2D acceleration)
 * 8 MB of address space per client should be enough.
 */

This seems to be quiet a lot of pmem per client, as I imagine there
would be a lot of clients in the system.

Could anyone please clarify?

thanks,
anand

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