OP-TEE: Shared memory between TAs
summary
OP-TEE adds on-demand shared mapping of ELF read-only code pages so multiple TA instances or libraries reuse the same physical pages, cutting memory use; it uses a file tag (hash) to identify identical binaries, per-page FOP backing stores, context-specific areas and a global PMM pool, and reference counting for lifecycle. It supports both paged and flat (no-MMU) modes, does not implement copy-on-write, and is under review on GitHub.
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chapters (6)
- 0:00Introduction to shared memory
- 2:20Paged memory and mapping
- 4:52Data structures and management
- 8:10Page registration and sharing
- 11:25Lifecycle and reference counts
- 15:09Q&A and technical discussion
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