20 Apr
2020
20 Apr
'20
8:45 p.m.
By "asynchronous" I don't mean "hours later".
Make it be "interrupts are enabled, before serializing instruction".
Yes, we want bounded error handling latency. But that doesn't mean "synchronous"
Another X86 vendor seems to be adding something like that. See MCOMMIT in https://www.amd.com/system/files/TechDocs/24594.pdf
But I wonder how an OS will know whether it is running some smart MCOMMIT-aware application that can figure out what to do with bad data, or a legacy application that should probably be stopped before it hurts somebody.
I also wonder how expensive MCOMMIT is (since it is essentially polling for "did any errors happen").
-Tony