| commit | 3c0f5f465d348f9a1b2f8259a9af0a99aad81bf0 | [log] [tgz] |
|---|---|---|
| author | Carlos Pizano Uribe <cpu@fuchsia.infra.roller.google.com> | Wed Apr 23 12:49:20 2025 -0700 |
| committer | Copybara-Service <copybara-worker@google.com> | Wed Apr 23 12:51:34 2025 -0700 |
| tree | 3e1c88352e52437265eec35df62b940de5cab0ee | |
| parent | 2720b0402a5107e15690f12b4585aff59f230a36 [diff] |
[roll] Roll fuchsia [kernel][vm] Compressed pointers for VmPageListNode This CL adds two methods to PmmNode uint32_t PageToIndex(const vm_page_t* page); vm_page_t* IndexToPage(uint32_t index); They "compress" a vm_page_t pointer to a 32 uint with the 4 least significant bits as zero. Then we use this page <--> index to convert VmPageOrMarker from 64 bits to 32 bits which ends up saving 64 bytes per VmPageListNode which in starnix-based products which hold upwards of 80K nodes, ends up saving 5+ MiBs This comes at some cost: 1- The max # of PMM arenas are limited to 16 and each arena of a max of 2^20 pages, or some other combination that yields 2^24 bits 2- The conversion from page to index is O(n) in the numbers of arenas though the cost is fixed and relatively small. BUG=408058440 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1244412 Original-Revision: 0c022e8550329000427243111dca761d5a976296 GitOrigin-RevId: 41543926bfb785f2c9f15d308da9bc348cae49eb Change-Id: Ifb945a1f6dd5751e057542d5a99fb3a53e4862b3
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