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Pulling slabs out of struct page

Pulling slabs out of struct page

Posted Oct 10, 2021 14:57 UTC (Sun) by willy (subscriber, #9762)
In reply to: Pulling slabs out of struct page by luto
Parent article: Pulling slabs out of struct page

Having the full register file doesn't matter if the store that dirtied the cache line was 10ms ago. I can't imagine how any CPU vendor would keep the register state around until the cache line moves from L3 to DRAM

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Pulling slabs out of struct page

Posted Oct 10, 2021 15:32 UTC (Sun) by luto (subscriber, #39314) [Link]

You’re assuming that the CPU will notify the OS at all when a store from L3 to DRAM fails and that the OS actually needs to do anything about it. I don’t know all the nasty details, but it may be possible (and even mandatory?) to mark the memory bad when writeback fails and deliver a fault on a subsequent read.


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