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document relatively high performance cost of MPK

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Daniel Micay 2018-10-23 19:38:00 -04:00
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README.md
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@ -67,7 +67,9 @@ The available configuration options are the following:
* `CONFIG_SEAL_METADATA`: `true` or `false` (default) to control whether Memory
Protection Keys are used to disable access to all writable allocator state
outside of the memory allocator code. It's currently disabled by default due
to being extremely experimental and needing some minor optimization work.
to being extremely experimental and a significant performance cost for this
use case on current generation hardware, which may become drastically lower
in the future.
Compile-time configuration is available in the `config.h` file for controlling
the balance between security and performance / memory usage. By default, all