Pulling slabs out of struct page
Pulling slabs out of struct page
Posted Oct 9, 2021 15:46 UTC (Sat) by willy (subscriber, #9762)In reply to: Pulling slabs out of struct page by luto
Parent article: Pulling slabs out of struct page
> At the risk of asking a horrible question: do we really need the ability to start with a _page_ (PFN mapped to userspace, for example) and find type information?
Yes. Some of the places we need this:
- GUP gets back a page and then calls set_page_dirty(). That needs to figure out whether this is a file/anon/ksm/netpool/DEVICE/... page and call the filesystem if required.
- compaction walks the memmap and needs to figure out what this memory is and whether it can be relocated.
- memory failure gets a physical address and needs to understand how to handle it
There are more, but these should illustrate some of the problems we have to solve.
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