path: root/share/man/man4
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authorAlan Cox <alc@FreeBSD.org>2023-05-29 06:01:37 +0000
committerAlan Cox <alc@FreeBSD.org>2023-05-29 16:22:55 +0000
commit3e7e2bb2467e8bb682176125397168c88c3913c6 (patch)
tree018f6027100409862f82c8ea0a6f29b8b3f1cfcb /share/man/man4
parent8792c03886d9e6df10fbac825819603dc059c7ea (diff)
arm64 pmap: Make VM_PAGE_TO_PV_LIST_LOCK() a constant-time operationHEADmain
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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