3ae3919d0b
mutex. With the demise of Alpha support, there is no longer a reason for it to be a spin mutex.
331 lines
8.5 KiB
C
331 lines
8.5 KiB
C
/*-
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* Copyright (c) 1998 Matthew Dillon. All Rights Reserved.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_vmpage.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/linker_set.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/vmmeter.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_extern.h>
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static void vm_coloring_init(void);
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void setPQL2(int *const size, int *const ways);
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struct vpgqueues vm_page_queues[PQ_MAXCOUNT];
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struct pq_coloring page_queue_coloring;
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static int pq_cachesize = 0; /* size of the cache in KB */
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static int pq_cachenways = 0; /* associativity of the cache */
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SYSCTL_NODE(_vm_stats, OID_AUTO, pagequeue, CTLFLAG_RW, 0, "VM meter stats");
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SYSCTL_INT(_vm_stats_pagequeue, OID_AUTO, page_colors, CTLFLAG_RD,
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&(PQ_NUMCOLORS), 0, "Number of colors in the page queue");
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SYSCTL_INT(_vm_stats_pagequeue, OID_AUTO, cachesize, CTLFLAG_RD,
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&pq_cachesize, 0, "Size of the processor cache in KB");
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SYSCTL_INT(_vm_stats_pagequeue, OID_AUTO, cachenways, CTLFLAG_RD,
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&pq_cachenways, 0, "Associativity of the processor cache");
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SYSCTL_INT(_vm_stats_pagequeue, OID_AUTO, prime1, CTLFLAG_RD,
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&(PQ_PRIME1), 0, "Cache tuning value");
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SYSCTL_INT(_vm_stats_pagequeue, OID_AUTO, prime2, CTLFLAG_RD,
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&(PQ_PRIME2), 0, "Cache tuning value");
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static void
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vm_coloring_init(void)
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{
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#ifdef PQ_NOOPT
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PQ_NUMCOLORS = PQ_PRIME1 = PQ_PRIME2 = 1;
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#else
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setPQL2(&pq_cachesize, &pq_cachenways);
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CTASSERT(PAGE_SIZE/1024 > 0);
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if (pq_cachesize > 0 && pq_cachenways > 0)
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PQ_NUMCOLORS = pq_cachesize / (PAGE_SIZE/1024) / \
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pq_cachenways;
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else
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PQ_NUMCOLORS = 32;
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if (PQ_MAXCOLORS < PQ_NUMCOLORS) {
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printf("VM-PQ color limit (PQ_MAXCOLORS=%u) exceeded (%u), see vm_page.h", PQ_MAXCOLORS, PQ_NUMCOLORS);
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PQ_NUMCOLORS = PQ_MAXCOLORS;
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}
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if (PQ_NUMCOLORS >= 128) {
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PQ_PRIME1 = 31;
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PQ_PRIME2 = 23;
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} else if (PQ_NUMCOLORS >= 64) {
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PQ_PRIME1 = 13;
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PQ_PRIME2 = 7;
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} else if (PQ_NUMCOLORS >= 32) {
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PQ_PRIME1 = 9;
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PQ_PRIME2 = 5;
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} else if (PQ_NUMCOLORS >= 16) {
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PQ_PRIME1 = 5;
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PQ_PRIME2 = 3;
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} else
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PQ_NUMCOLORS = PQ_PRIME1 = PQ_PRIME2 = 1;
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#endif
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/*
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* PQ_CACHE represents a
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* PQ_NUMCOLORS consecutive queue.
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*/
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PQ_COLORMASK = PQ_NUMCOLORS - 1;
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PQ_INACTIVE = 1 + PQ_NUMCOLORS;
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PQ_ACTIVE = 2 + PQ_NUMCOLORS;
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PQ_CACHE = 3 + PQ_NUMCOLORS;
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PQ_HOLD = 3 + 2 * PQ_NUMCOLORS;
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PQ_COUNT = 4 + 2 * PQ_NUMCOLORS;
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PQ_MAXLENGTH = PQ_NUMCOLORS / 3 + PQ_PRIME1;
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#if 0
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/* XXX: is it possible to allocate vm_page_queues[PQ_COUNT] here? */
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#error XXX: vm_page_queues = malloc(PQ_COUNT * sizeof(struct vpgqueues));
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#endif
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if (bootverbose)
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if (PQ_NUMCOLORS > 1)
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printf("Using %d colors for the VM-PQ tuning (%d, %d)\n",
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PQ_NUMCOLORS, pq_cachesize, pq_cachenways);
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}
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void
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vm_pageq_init(void)
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{
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int i;
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vm_coloring_init();
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for (i = 0; i < PQ_NUMCOLORS; ++i) {
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vm_page_queues[PQ_FREE+i].cnt = &cnt.v_free_count;
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}
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for (i = 0; i < PQ_NUMCOLORS; ++i) {
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vm_page_queues[PQ_CACHE + i].cnt = &cnt.v_cache_count;
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}
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vm_page_queues[PQ_INACTIVE].cnt = &cnt.v_inactive_count;
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vm_page_queues[PQ_ACTIVE].cnt = &cnt.v_active_count;
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vm_page_queues[PQ_HOLD].cnt = &cnt.v_active_count;
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for (i = 0; i < PQ_COUNT; i++) {
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TAILQ_INIT(&vm_page_queues[i].pl);
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}
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}
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void
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vm_pageq_requeue(vm_page_t m)
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{
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int queue = VM_PAGE_GETQUEUE(m);
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struct vpgqueues *vpq;
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if (queue != PQ_NONE) {
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vpq = &vm_page_queues[queue];
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TAILQ_REMOVE(&vpq->pl, m, pageq);
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TAILQ_INSERT_TAIL(&vpq->pl, m, pageq);
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}
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}
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/*
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* vm_pageq_enqueue:
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*/
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void
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vm_pageq_enqueue(int queue, vm_page_t m)
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{
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struct vpgqueues *vpq;
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vpq = &vm_page_queues[queue];
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VM_PAGE_SETQUEUE2(m, queue);
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TAILQ_INSERT_TAIL(&vpq->pl, m, pageq);
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++*vpq->cnt;
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++vpq->lcnt;
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}
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/*
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* vm_add_new_page:
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*
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* Add a new page to the freelist for use by the system.
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*/
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void
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vm_pageq_add_new_page(vm_paddr_t pa)
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{
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vm_page_t m;
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atomic_add_int(&cnt.v_page_count, 1);
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m = PHYS_TO_VM_PAGE(pa);
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m->phys_addr = pa;
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m->flags = 0;
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m->pc = (pa >> PAGE_SHIFT) & PQ_COLORMASK;
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pmap_page_init(m);
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mtx_lock(&vm_page_queue_free_mtx);
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vm_pageq_enqueue(m->pc + PQ_FREE, m);
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mtx_unlock(&vm_page_queue_free_mtx);
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}
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/*
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* vm_pageq_remove_nowakeup:
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*
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* vm_page_unqueue() without any wakeup
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*
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* The queue containing the given page must be locked.
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* This routine may not block.
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*/
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void
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vm_pageq_remove_nowakeup(vm_page_t m)
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{
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int queue = VM_PAGE_GETQUEUE(m);
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struct vpgqueues *pq;
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if (queue != PQ_NONE) {
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pq = &vm_page_queues[queue];
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VM_PAGE_SETQUEUE2(m, PQ_NONE);
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TAILQ_REMOVE(&pq->pl, m, pageq);
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(*pq->cnt)--;
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pq->lcnt--;
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}
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}
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/*
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* vm_pageq_remove:
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*
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* Remove a page from its queue.
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*
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* The queue containing the given page must be locked.
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* This routine may not block.
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*/
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void
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vm_pageq_remove(vm_page_t m)
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{
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int queue = VM_PAGE_GETQUEUE(m);
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struct vpgqueues *pq;
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if (queue != PQ_NONE) {
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VM_PAGE_SETQUEUE2(m, PQ_NONE);
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pq = &vm_page_queues[queue];
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TAILQ_REMOVE(&pq->pl, m, pageq);
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(*pq->cnt)--;
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pq->lcnt--;
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if (VM_PAGE_RESOLVEQUEUE(m, queue) == PQ_CACHE) {
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if (vm_paging_needed())
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pagedaemon_wakeup();
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}
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}
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}
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#ifndef PQ_NOOPT
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/*
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* vm_pageq_find:
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*
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* Find a page on the specified queue with color optimization.
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*
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* The page coloring optimization attempts to locate a page
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* that does not overload other nearby pages in the object in
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* the cpu's L2 cache. We need this optimization because cpu
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* caches tend to be physical caches, while object spaces tend
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* to be virtual.
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*
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* The specified queue must be locked.
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* This routine may not block.
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*
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* This routine may only be called from the vm_pageq_find()
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* function in this file.
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*/
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static inline vm_page_t
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_vm_pageq_find(int basequeue, int index)
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{
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int i;
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vm_page_t m = NULL;
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struct vpgqueues *pq;
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pq = &vm_page_queues[basequeue];
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/*
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* Note that for the first loop, index+i and index-i wind up at the
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* same place. Even though this is not totally optimal, we've already
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* blown it by missing the cache case so we do not care.
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*/
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for (i = PQ_NUMCOLORS / 2; i > 0; --i) {
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if ((m = TAILQ_FIRST(&pq[(index + i) & PQ_COLORMASK].pl)) \
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!= NULL)
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break;
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if ((m = TAILQ_FIRST(&pq[(index - i) & PQ_COLORMASK].pl)) \
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!= NULL)
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break;
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}
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return (m);
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}
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#endif /* PQ_NOOPT */
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vm_page_t
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vm_pageq_find(int basequeue, int index, boolean_t prefer_zero)
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{
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vm_page_t m;
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#ifndef PQ_NOOPT
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if (PQ_NUMCOLORS > 1) {
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if (prefer_zero) {
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m = TAILQ_LAST(&vm_page_queues[basequeue+index].pl, \
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pglist);
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} else {
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m = TAILQ_FIRST(&vm_page_queues[basequeue+index].pl);
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}
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if (m == NULL) {
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m = _vm_pageq_find(basequeue, index);
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}
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} else {
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#endif
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if (prefer_zero) {
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m = TAILQ_LAST(&vm_page_queues[basequeue].pl, pglist);
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} else {
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m = TAILQ_FIRST(&vm_page_queues[basequeue].pl);
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}
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#ifndef PQ_NOOPT
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}
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#endif
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return (m);
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}
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