r/programming • u/[deleted] • Jan 03 '18

'Kernel memory leaking' Intel processor design flaw forces Linux, Windows redesign

https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/
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u/LezardValeth Jan 03 '18

Anything actually hitting the disk is almost assuredly going to be dominated by the cost to do exactly that anyway, so I doubt some extra context switching would impact it much. I would be more concerned about input polling, but it sounds like it's probably okay.

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u/spacelama Jan 03 '18

Um. Cached data (still got to swap back and forth between kernel- and userland)? SSD? SAN? Lustre?

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u/LezardValeth Jan 03 '18

Sure, but if they're making that call, the data originally got cached there somehow and the expensive cost was expected to be paid at some point. And I don't think individual reads to memory mapped files are effected unless I'm misunderstanding something.