1 /* $OpenBSD: uvm_percpu.h,v 1.3 2024/05/01 12:54:27 mpi Exp $ */ 2 3 /* 4 * Copyright (c) 2024 Martin Pieuchot <mpi@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #ifndef _UVM_UVM_PCPU_H_ 20 #define _UVM_UVM_PCPU_H_ 21 22 struct vm_page; 23 24 /* 25 * The number of pages per magazine should be large enough to get rid of the 26 * contention in the pmemrange allocator during concurrent page faults and 27 * small enough to limit fragmentation. 28 */ 29 #define UVM_PMR_CACHEMAGSZ 8 30 31 /* 32 * Magazine 33 */ 34 struct uvm_pmr_cache_item { 35 struct vm_page *upci_pages[UVM_PMR_CACHEMAGSZ]; 36 int upci_npages; /* # of pages in magazine */ 37 }; 38 39 /* 40 * Per-CPU cache of physical pages. 41 */ 42 struct uvm_pmr_cache { 43 struct uvm_pmr_cache_item upc_magz[2]; /* magazines */ 44 int upc_actv; /* index of active magazine */ 45 46 }; 47 48 #endif /* _UVM_UVM_PCPU_H_ */ 49