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A comment on Intel Discloses Lakefield CPUs Specifications. Parent comment

Re:Intel Discloses Lakefield CPUs Specifications by wtallis on Wednesday June 10, 2020 @03:28PM (#23481044)
Once per process. I doubt operating systems will start modifying executables and libraries on-disk to tag them as using relevant instruction set extensions.

And generally speaking, when an application first starts issuing SIMD instructions, that's probably not the a great time to be interrupting it even if it only needs to happen once.

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Re:Intel Discloses Lakefield CPUs Specifications by gpderetta on Wednesday June 10, 2020 @05:21PM (#23482269)
once per process is perfectly fine.

the issue is that once you have an active process using a feature only available on the larger cores, you can't shut off the larger cores to save power without paying a large latency to wake up that process.

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Re:Intel Discloses Lakefield CPUs Specifications by loeg on Wednesday June 10, 2020 @03:52PM (#23481286)
You could imagine it as an ELF note of some kind. It's not a direction I've love to go in, and catching illegal exception traps seems fast enough that the more complicated design doesn't seem worthwhile.
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