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c869e67208
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
127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/*-
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* Copyright (c) 2002-2006 Rice University
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* Copyright (c) 2007 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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* Physical memory system definitions
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*/
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#ifndef _VM_PHYS_H_
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#define _VM_PHYS_H_
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#ifdef _KERNEL
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/* Domains must be dense (non-sparse) and zero-based. */
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struct mem_affinity {
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vm_paddr_t start;
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vm_paddr_t end;
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int domain;
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};
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struct vm_freelist {
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struct pglist pl;
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int lcnt;
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};
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struct vm_phys_seg {
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vm_paddr_t start;
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vm_paddr_t end;
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vm_page_t first_page;
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int domain;
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struct vm_freelist (*free_queues)[VM_NFREEPOOL][VM_NFREEORDER];
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};
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extern struct mem_affinity *mem_affinity;
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extern int *mem_locality;
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extern int vm_ndomains;
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extern struct vm_phys_seg vm_phys_segs[];
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extern int vm_phys_nsegs;
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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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void vm_phys_add_page(vm_paddr_t pa);
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void vm_phys_add_seg(vm_paddr_t start, vm_paddr_t end);
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vm_page_t vm_phys_alloc_contig(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_phys_alloc_freelist_pages(int freelist, int pool, int order);
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vm_page_t vm_phys_alloc_pages(int pool, int order);
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boolean_t vm_phys_domain_intersects(long mask, vm_paddr_t low, vm_paddr_t high);
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int vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
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vm_memattr_t memattr);
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void vm_phys_fictitious_unreg_range(vm_paddr_t start, vm_paddr_t end);
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vm_page_t vm_phys_fictitious_to_vm_page(vm_paddr_t pa);
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void vm_phys_free_contig(vm_page_t m, u_long npages);
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void vm_phys_free_pages(vm_page_t m, int order);
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void vm_phys_init(void);
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vm_page_t vm_phys_paddr_to_vm_page(vm_paddr_t pa);
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vm_page_t vm_phys_scan_contig(u_long npages, vm_paddr_t low, vm_paddr_t high,
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u_long alignment, vm_paddr_t boundary, int options);
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void vm_phys_set_pool(int pool, vm_page_t m, int order);
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boolean_t vm_phys_unfree_page(vm_page_t m);
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boolean_t vm_phys_zero_pages_idle(void);
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int vm_phys_mem_affinity(int f, int t);
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/*
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* vm_phys_domain:
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*
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* Return the memory domain the page belongs to.
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*/
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static inline struct vm_domain *
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vm_phys_domain(vm_page_t m)
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{
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#if MAXMEMDOM > 1
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int domn, segind;
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/* XXXKIB try to assert that the page is managed */
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segind = m->segind;
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KASSERT(segind < vm_phys_nsegs, ("segind %d m %p", segind, m));
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domn = vm_phys_segs[segind].domain;
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KASSERT(domn < vm_ndomains, ("domain %d m %p", domn, m));
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return (&vm_dom[domn]);
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#else
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return (&vm_dom[0]);
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#endif
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}
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static inline void
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vm_phys_freecnt_adj(vm_page_t m, int adj)
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{
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mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
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vm_cnt.v_free_count += adj;
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vm_phys_domain(m)->vmd_free_count += adj;
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}
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#endif /* _KERNEL */
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#endif /* !_VM_PHYS_H_ */
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