8d11dd01a1
this change is to improve concurrency: - Drop global state stored in the shadow overflow page table (and all other global state) - Remove all global locks - Use per-PTE lock bits to allow parallel page insertion - Reconstruct state when requested for evicted PTEs instead of buffering it during overflow This drops total wall time for make buildworld on a 32-thread POWER8 system by a factor of two and system time by a factor of three, providing performance 20% better than similarly clocked Core i7 Xeons per-core. Performance on smaller SMP systems, where PMAP lock contention was not as much of an issue, is nearly unchanged. Tested on: POWER8, POWER5+, G5 UP, G5 SMP (64-bit and 32-bit kernels) Merged from: user/nwhitehorn/ppc64-pmap-rework Looked over by: jhibbits, andreast MFC after: 3 months Relnotes: yes Sponsored by: FreeBSD Foundation
122 lines
3.7 KiB
Objective-C
122 lines
3.7 KiB
Objective-C
#-
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# Copyright (c) 2010,2015 Nathan Whitehorn
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# All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <machine/mmuvar.h>
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/**
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* MOEA64 kobj methods for 64-bit Book-S page table
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* manipulation routines used, for example, by hypervisors.
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*/
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INTERFACE moea64;
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CODE {
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static moea64_pte_replace_t moea64_pte_replace_default;
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static int64_t moea64_pte_replace_default(mmu_t mmu,
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struct pvo_entry *pvo, int flags)
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{
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int64_t refchg;
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refchg = MOEA64_PTE_UNSET(mmu, pvo);
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MOEA64_PTE_INSERT(mmu, pvo);
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return (refchg);
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}
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}
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/**
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* Return ref/changed bits from PTE referenced by _pvo if _pvo is currently in
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* the page table. Returns -1 if _pvo not currently present in the page table.
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*/
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METHOD int64_t pte_synch {
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mmu_t _mmu;
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struct pvo_entry *_pvo;
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};
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/**
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* Clear bits ptebit (a mask) from the low word of the PTE referenced by
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* _pvo. Return previous values of ref/changed bits or -1 if _pvo is not
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* currently in the page table.
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*/
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METHOD int64_t pte_clear {
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mmu_t _mmu;
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struct pvo_entry *_pvo;
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uint64_t _ptebit;
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};
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/**
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* Invalidate the PTE referenced by _pvo, returning its ref/changed bits.
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* Returns -1 if PTE not currently present in page table.
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*/
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METHOD int64_t pte_unset {
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mmu_t _mmu;
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struct pvo_entry *_pvo;
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};
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/**
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* Update the reference PTE to correspond to the contents of _pvo. Has the
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* same ref/changed semantics as pte_unset() (and should clear R/C bits). May
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* change the PVO's location in the page table or return with it unmapped if
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* PVO_WIRED is not set. By default, does unset() followed by insert().
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*
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* _flags is a bitmask describing what level of page invalidation should occur:
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* 0 means no invalidation is required
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* MOEA64_PTE_PROT_UPDATE signifies that the page protection bits are changing
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* MOEA64_PTE_INVALIDATE requires an invalidation of the same strength as
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* pte_unset() followed by pte_insert()
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*/
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METHOD int64_t pte_replace {
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mmu_t _mmu;
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struct pvo_entry *_pvo;
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int _flags;
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} DEFAULT moea64_pte_replace_default;
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/**
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* Insert a PTE corresponding to _pvo into the page table, returning any errors
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* encountered and (optionally) setting the PVO slot value to some
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* representation of where the entry was placed.
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*
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* Must not replace PTEs marked LPTE_WIRED. If an existing valid PTE is spilled,
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* must synchronize ref/changed bits as in pte_unset().
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*/
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METHOD int pte_insert {
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mmu_t _mmu;
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struct pvo_entry *_pvo;
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};
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