9133d44ed0
then rather than do more try-locks and eventually sleep for a tick, take a hold on the current owner's lock, drop the page interlock, and acquire the lock that we took the hold on in a blocking fashion. After we get the lock, check if the lock that we acquired is still the lock for the owner of the page that we're interested in. If the owner hasn't changed then can proceed with this page, otherwise we will skip this page and move on to a different page. This dramatically reduces the amount of time that the pagedaemon sleeps trying to get locks, since even 1 tick is an eternity to sleep in this context and it was easy to trigger that case in practice, and with this new method the pagedaemon only very rarely actually blocks to acquire the lock that it wants since the object locks are adaptive, and when the pagedaemon does block then the amount of time it spends sleeping will be generally be much less than 1 tick.
193 lines
4.5 KiB
C
193 lines
4.5 KiB
C
/* $NetBSD: uvm_init.c,v 1.55 2020/11/04 01:30:19 chs Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
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*/
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/*
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* uvm_init.c: init the vm system.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: uvm_init.c,v 1.55 2020/11/04 01:30:19 chs Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/debug.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/resourcevar.h>
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#include <sys/kmem.h>
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#include <sys/mman.h>
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#include <sys/vnode.h>
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#include <uvm/uvm.h>
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#include <uvm/uvm_pdpolicy.h>
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#include <uvm/uvm_physseg.h>
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#include <uvm/uvm_readahead.h>
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/*
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* struct uvm: we store most global vars in this structure to make them
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* easier to spot...
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*/
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struct uvm uvm; /* decl */
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struct uvmexp uvmexp; /* decl */
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struct uvm_object *uvm_kernel_object;
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#if defined(__uvmexp_pagesize)
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const int * const uvmexp_pagesize = &uvmexp.pagesize;
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const int * const uvmexp_pagemask = &uvmexp.pagemask;
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const int * const uvmexp_pageshift = &uvmexp.pageshift;
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#endif
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kmutex_t uvm_kentry_lock __cacheline_aligned;
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/*
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* uvm_md_init: Init dependant on the MD boot context.
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* called from MD code.
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*/
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void
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uvm_md_init(void)
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{
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uvm_setpagesize(); /* initialize PAGE_SIZE-dependent variables */
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uvm_physseg_init();
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}
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/*
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* uvm_init: init the VM system. called from kern/init_main.c.
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*/
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void
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uvm_init(void)
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{
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vaddr_t kvm_start, kvm_end;
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/*
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* Ensure that the hardware set the page size, zero the UVM structure.
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*/
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if (uvmexp.pagesize == 0) {
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panic("uvm_init: page size not set");
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}
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memset(&uvm, 0, sizeof(uvm));
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averunnable.fscale = FSCALE;
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/*
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* Init the page sub-system. This includes allocating the vm_page
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* structures, and setting up all the page queues (and locks).
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* Available memory will be put in the "free" queue, kvm_start and
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* kvm_end will be set to the area of kernel virtual memory which
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* is available for general use.
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*/
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uvm_page_init(&kvm_start, &kvm_end);
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uvm_pglistalloc_init();
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/*
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* Init the map sub-system.
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*/
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uvm_map_init();
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/*
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* Setup the kernel's virtual memory data structures. This includes
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* setting up the kernel_map/kernel_object.
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* Bootstrap all kernel memory allocators.
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*/
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uao_init();
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uvm_km_bootstrap(kvm_start, kvm_end);
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/*
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* Setup uvm_map caches and init the amap.
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*/
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uvm_map_init_caches();
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uvm_amap_init();
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/*
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* Init the pmap module. The pmap module is free to allocate
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* memory for its private use (e.g. pvlists).
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*/
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pmap_init();
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/*
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* Make kernel memory allocators ready for use.
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* After this call the pool/kmem memory allocators can be used.
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*/
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uvm_km_init();
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#ifdef __HAVE_PMAP_PV_TRACK
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pmap_pv_init();
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#endif
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#ifdef DEBUG
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debug_init();
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#endif
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/*
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* Init all pagers and the pager_map.
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*/
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uvm_pager_init();
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/*
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* Initialize the uvm_loan() facility.
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*/
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uvm_loan_init();
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/*
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* Enable paging of kernel objects.
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* This second pass of initializing kernel_object requires rw_obj,
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* so initialize that first.
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*/
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rw_obj_init();
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uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
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UAO_FLAG_KERNSWAP);
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uvmpdpol_reinit();
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/*
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* Init anonymous memory systems.
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*/
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uvm_anon_init();
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uvm_uarea_init();
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/*
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* Init readahead mechanism.
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*/
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uvm_ra_init();
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}
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