49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* $OpenBSD: uvm_percpu.h,v 1.3 2024/05/01 12:54:27 mpi Exp $ */
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/*
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* Copyright (c) 2024 Martin Pieuchot <mpi@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _UVM_UVM_PCPU_H_
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#define _UVM_UVM_PCPU_H_
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struct vm_page;
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/*
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* The number of pages per magazine should be large enough to get rid of the
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* contention in the pmemrange allocator during concurrent page faults and
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* small enough to limit fragmentation.
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*/
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#define UVM_PMR_CACHEMAGSZ 8
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/*
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* Magazine
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*/
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struct uvm_pmr_cache_item {
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struct vm_page *upci_pages[UVM_PMR_CACHEMAGSZ];
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int upci_npages; /* # of pages in magazine */
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};
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/*
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* Per-CPU cache of physical pages.
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*/
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struct uvm_pmr_cache {
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struct uvm_pmr_cache_item upc_magz[2]; /* magazines */
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int upc_actv; /* index of active magazine */
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};
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#endif /* _UVM_UVM_PCPU_H_ */
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