Re: [PATCH v2 1/2] x86/sgx: Add accounting for tracking overcommit

[Dave Hansen]

On 1/11/22 06:20, Haitao Huang wrote:
> If the system has a ton of RAM but limited EPC, I think it makes sense 
> to allow more EPC swapping, can we do min(0.5*RAM, 2*EPC)?
> I suppose if the system is used for heavy enclave load, user would be 
> willing to at least use half of RAM.

If I have 100GB of RAM and 100MB of EPC, can I really *meaningfully* run 
50GB of enclaves?  In that case, if everything was swapped out evenly, I 
would only have a 499/500 chance that a given page reference would fault.

This isn't about a "heavy enclave load".  If there is *that* much 
swapped-out enclave memory, will an enclave even make meaningful forward 
progress?