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