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8343c406db
address and use this mechanism when:
1. kmem_alloc_{attr,contig}() can't find suitable free pages in the physical
memory allocator's free page lists. This replaces the long-standing
approach of scanning the inactive and inactive queues, converting clean
pages into PG_CACHED pages and laundering dirty pages. In contrast, the
new mechanism does not use PG_CACHED pages nor does it trigger a large
number of I/O operations.
2. on 32-bit MIPS processors, uma_small_alloc() and the pmap can't find
free pages in the physical memory allocator's free page lists that are
covered by the direct map. Tested by: adrian
3. ttm_bo_global_init() and ttm_vm_page_alloc_dma32() can't find suitable
free pages in the physical memory allocator's free page lists.
In the coming months, I expect that this new mechanism will be applied in
other places. For example, balloon drivers should use relocation to
minimize fragmentation of the guest physical address space.
Make vm_phys_alloc_contig() a little smarter (and more efficient in some
cases). Specifically, use vm_phys_segs[] earlier to avoid scanning free
page lists that can't possibly contain suitable pages.
Reviewed by: kib, markj
Glanced at: jhb
Discussed with: jeff
Sponsored by: EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D4444
72 lines
2.8 KiB
C
72 lines
2.8 KiB
C
/*-
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* Copyright (c) 2002-2006 Rice University
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* Copyright (c) 2007-2008 Alan L. Cox <alc@cs.rice.edu>
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Alan L. Cox,
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* Olivier Crameri, Peter Druschel, Sitaram Iyer, and Juan Navarro.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Superpage reservation management definitions
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*/
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#ifndef _VM_RESERV_H_
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#define _VM_RESERV_H_
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#ifdef _KERNEL
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#if VM_NRESERVLEVEL > 0
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/*
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* The following functions are only to be used by the virtual memory system.
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*/
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vm_page_t vm_reserv_alloc_contig(vm_object_t object, vm_pindex_t pindex,
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u_long npages, vm_paddr_t low, vm_paddr_t high,
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u_long alignment, vm_paddr_t boundary);
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vm_page_t vm_reserv_alloc_page(vm_object_t object, vm_pindex_t pindex,
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vm_page_t mpred);
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void vm_reserv_break_all(vm_object_t object);
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boolean_t vm_reserv_free_page(vm_page_t m);
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void vm_reserv_init(void);
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bool vm_reserv_is_page_free(vm_page_t m);
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int vm_reserv_level(vm_page_t m);
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int vm_reserv_level_iffullpop(vm_page_t m);
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boolean_t vm_reserv_reactivate_page(vm_page_t m);
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boolean_t vm_reserv_reclaim_contig(u_long npages, vm_paddr_t low,
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vm_paddr_t high, u_long alignment, vm_paddr_t boundary);
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boolean_t vm_reserv_reclaim_inactive(void);
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void vm_reserv_rename(vm_page_t m, vm_object_t new_object,
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vm_object_t old_object, vm_pindex_t old_object_offset);
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int vm_reserv_size(int level);
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vm_paddr_t vm_reserv_startup(vm_offset_t *vaddr, vm_paddr_t end,
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vm_paddr_t high_water);
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#endif /* VM_NRESERVLEVEL > 0 */
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#endif /* _KERNEL */
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#endif /* !_VM_RESERV_H_ */
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