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| /freebsd-current/sys/arm64/arm64/ | ||
| H A D | pmap.c | diff 3e7e2bb2 Mon May 29 00:01:37 MDT 2023 Alan Cox <alc@FreeBSD.org> arm64 pmap: Make VM_PAGE_TO_PV_LIST_LOCK() a constant-time operation The prior implementation of VM_PAGE_TO_PV_LIST_LOCK() performed a linear-time search of the vm_phys_segs[] array. However, in contrast to PHYS_TO_PV_LIST_LOCK(), that search is unnecessary because every (non- fictitious) vm_page contains the index of the vm_phys_seg in which it resides. Change most of the remaining uses of CHANGE_PV_LIST_LOCK_TO_PHYS() and PHYS_TO_PV_LIST_LOCK() to CHANGE_PV_LIST_LOCK_TO_VM_PAGE() and VM_PAGE_TO_PV_LIST_LOCK(), respectively. Collectively, these changes also reduce the size of a GENERIC-NODEBUG kernel's pmap. Before: text data bss dec hex filename 70144 3200 2248 75592 0x12748 pmap.o After: text data bss dec hex filename 69192 3200 2248 74640 0x12390 pmap.o Reviewed by: kib, markj Differential Revision: https://reviews.freebsd.org/D40306 |
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