361 lines
8.3 KiB
C
361 lines
8.3 KiB
C
/*
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* Copyright (c) 1997 John S. Dyson
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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 immediately at the beginning of the file, without modification,
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* 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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* 3. Absolutely no warranty of function or purpose is made by the author
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* John S. Dyson.
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* 4. This work was done expressly for inclusion into FreeBSD. Other use
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* is allowed if this notation is included.
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* 5. Modifications may be freely made to this file if the above conditions
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* are met.
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*
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* $Id: vm_zone.c,v 1.5 1997/08/18 03:29:21 fsmp Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_page.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_zone.h>
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/*
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* This file comprises a very simple zone allocator. This is used
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* in lieu of the malloc allocator, where needed or more optimal.
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*
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* Note that the initial implementation of this had coloring, and
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* absolutely no improvement (actually perf degradation) occurred.
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*
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* zinitna, zinit, zbootinit are the initialization routines.
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* zalloc, zfree, are the interrupt/lock unsafe allocation/free routines.
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* zalloci, zfreei, are the interrupt/lock safe allocation/free routines.
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*/
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struct vm_zone *zlist;
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int sysctl_vm_zone SYSCTL_HANDLER_ARGS;
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/*
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* Create a zone, but don't allocate the zone structure. If the
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* zone had been previously created by the zone boot code, initialize
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* various parts of the zone code.
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*
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* If waits are not allowed during allocation (e.g. during interrupt
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* code), a-priori allocate the kernel virtual space, and allocate
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* only pages when needed.
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*
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* Arguments:
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* z pointer to zone structure.
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* obj pointer to VM object (opt).
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* name name of zone.
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* size size of zone entries.
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* nentries number of zone entries allocated (only ZONE_INTERRUPT.)
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* flags ZONE_INTERRUPT -- items can be allocated at interrupt time.
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* zalloc number of pages allocated when memory is needed.
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*
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* Note that when using ZONE_INTERRUPT, the size of the zone is limited
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* by the nentries argument. The size of the memory allocatable is
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* unlimited if ZONE_INTERRUPT is not set.
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*
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*/
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int
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zinitna(vm_zone_t z, vm_object_t obj, char *name, int size,
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int nentries, int flags, int zalloc) {
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int totsize;
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if ((z->zflags & ZONE_BOOT) == 0) {
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z->zsize = size;
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simple_lock_init(&z->zlock);
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z->zfreecnt = 0;
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z->ztotal = 0;
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z->zmax = 0;
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z->zname = name;
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z->znalloc = 0;
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if (zlist == 0) {
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zlist = z;
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} else {
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z->znext = zlist;
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zlist = z;
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}
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}
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z->zflags |= flags;
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/*
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* If we cannot wait, allocate KVA space up front, and we will fill
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* in pages as needed.
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*/
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if (z->zflags & ZONE_INTERRUPT) {
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totsize = round_page(z->zsize * nentries);
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z->zkva = kmem_alloc_pageable(kernel_map, totsize);
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if (z->zkva == 0) {
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return 0;
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}
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z->zpagemax = totsize / PAGE_SIZE;
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if (obj == NULL) {
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z->zobj = vm_object_allocate(OBJT_DEFAULT, z->zpagemax);
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} else {
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z->zobj = obj;
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_vm_object_allocate(OBJT_DEFAULT, z->zpagemax, obj);
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}
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z->zallocflag = VM_ALLOC_INTERRUPT;
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z->zmax += nentries;
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} else {
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z->zallocflag = VM_ALLOC_SYSTEM;
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z->zmax = 0;
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}
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if ( z->zsize > PAGE_SIZE)
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z->zfreemin = 1;
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else
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z->zfreemin = PAGE_SIZE / z->zsize;
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z->zpagecount = 0;
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if (zalloc)
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z->zalloc = zalloc;
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else
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z->zalloc = 1;
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return 1;
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}
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/*
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* Subroutine same as zinitna, except zone data structure is allocated
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* automatically by malloc. This routine should normally be used, except
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* in certain tricky startup conditions in the VM system -- then
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* zbootinit and zinitna can be used. Zinit is the standard zone
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* initialization call.
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*/
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vm_zone_t
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zinit(char *name, int size, int nentries, int flags, int zalloc) {
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vm_zone_t z;
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z = (vm_zone_t) malloc(sizeof (struct vm_zone), M_ZONE, M_NOWAIT);
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if (z == NULL)
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return NULL;
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z->zflags = 0;
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if (zinitna(z, NULL, name, size, nentries, flags, zalloc) == 0) {
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free(z, M_ZONE);
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return NULL;
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}
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return z;
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}
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/*
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* Initialize a zone before the system is fully up. This routine should
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* only be called before full VM startup.
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*/
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void
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zbootinit(vm_zone_t z, char *name, int size, void *item, int nitems) {
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int i;
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z->zname = name;
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z->zsize = size;
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z->zpagemax = 0;
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z->zobj = NULL;
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z->zflags = ZONE_BOOT;
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z->zfreemin = 0;
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z->zallocflag = 0;
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z->zpagecount = 0;
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z->zalloc = 0;
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z->znalloc = 0;
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simple_lock_init(&z->zlock);
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for (i = 0; i < nitems; i++) {
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* (void **) item = z->zitems;
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z->zitems = item;
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(char *) item += z->zsize;
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}
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z->zfreecnt = nitems;
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z->zmax = nitems;
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z->ztotal = nitems;
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if (zlist == 0) {
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zlist = z;
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} else {
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z->znext = zlist;
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zlist = z;
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}
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}
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/*
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* Zone critical region locks.
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*/
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static inline int
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zlock(vm_zone_t z) {
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int s;
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s = splhigh();
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simple_lock(&z->zlock);
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return s;
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}
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static inline void
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zunlock(vm_zone_t z, int s) {
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simple_unlock(&z->zlock);
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splx(s);
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}
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/*
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* void *zalloc(vm_zone_t zone) --
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* Returns an item from a specified zone.
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*
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* void zfree(vm_zone_t zone, void *item) --
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* Frees an item back to a specified zone.
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*
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* void *zalloci(vm_zone_t zone) --
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* Returns an item from a specified zone, interrupt safe.
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*
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* void zfreei(vm_zone_t zone, void *item) --
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* Frees an item back to a specified zone, interrupt safe.
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*
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*/
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/*
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* Zone allocator/deallocator. These are interrupt / (or potentially SMP)
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* safe. The raw zalloc/zfree routines are in the vm_zone header file,
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* and are not interrupt safe, but are fast.
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*/
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void *
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zalloci(vm_zone_t z) {
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int s;
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void *item;
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s = zlock(z);
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item = _zalloc(z);
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zunlock(z, s);
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return item;
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}
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void
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zfreei(vm_zone_t z, void *item) {
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int s;
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s = zlock(z);
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_zfree(z, item);
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zunlock(z, s);
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return;
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}
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/*
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* Internal zone routine. Not to be called from external (non vm_zone) code.
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*/
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void *
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_zget(vm_zone_t z) {
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int i;
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vm_page_t m;
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int nitems;
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void *item;
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if (z->zflags & ZONE_INTERRUPT) {
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item = (char *) z->zkva + z->zpagecount * PAGE_SIZE;
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for( i = 0; ((i < z->zalloc) && (z->zpagecount < z->zpagemax)); i++) {
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m = vm_page_alloc( z->zobj, z->zpagecount, z->zallocflag);
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if (m == NULL) {
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break;
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}
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pmap_kenter(z->zkva + z->zpagecount * PAGE_SIZE, VM_PAGE_TO_PHYS(m));
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z->zpagecount++;
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}
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nitems = (i * PAGE_SIZE) / z->zsize;
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} else {
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/*
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* We can wait, so just do normal kernel map allocation
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*/
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item = (void *) kmem_alloc(kernel_map, z->zalloc * PAGE_SIZE);
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nitems = (z->zalloc * PAGE_SIZE) / z->zsize;
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}
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z->ztotal += nitems;
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/*
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* Save one for immediate allocation
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*/
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if (nitems != 0) {
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nitems -= 1;
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for (i = 0; i < nitems; i++) {
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* (void **) item = z->zitems;
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z->zitems = item;
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(char *) item += z->zsize;
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}
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z->zfreecnt += nitems;
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} else if (z->zfreecnt > 0) {
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item = z->zitems;
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z->zitems = *(void **) item;
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z->zfreecnt--;
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} else {
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item = NULL;
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}
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return item;
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}
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int
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sysctl_vm_zone SYSCTL_HANDLER_ARGS
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{
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int error=0;
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vm_zone_t curzone, nextzone;
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char tmpbuf[128];
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char tmpname[14];
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for (curzone = zlist; curzone; curzone = nextzone) {
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int i;
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int len;
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int offset;
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nextzone = curzone->znext;
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len = strlen(curzone->zname);
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if (len >= (sizeof(tmpname) - 1))
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len = (sizeof(tmpname) - 1);
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for(i = 0; i < sizeof(tmpname) - 1; i++)
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tmpname[i] = ' ';
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tmpname[i] = 0;
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memcpy(tmpname, curzone->zname, len);
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tmpname[len] = ':';
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offset = 0;
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if (curzone == zlist) {
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offset = 1;
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tmpbuf[0] = '\n';
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}
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sprintf(tmpbuf + offset,
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"%s limit=%8.8u, used=%6.6u, free=%6.6u, requests=%8.8u\n",
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tmpname, curzone->zmax,
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(curzone->ztotal - curzone->zfreecnt),
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curzone->zfreecnt, curzone->znalloc);
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len = strlen((char *)tmpbuf);
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if (nextzone == NULL) {
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tmpbuf[len - 1] = 0;
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}
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error = SYSCTL_OUT(req, tmpbuf, len);
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if (error)
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return (error);
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}
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return (0);
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}
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SYSCTL_OID(_kern, OID_AUTO, zone, CTLTYPE_STRING|CTLFLAG_RD, \
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NULL, 0, sysctl_vm_zone, "A", "Zone Info");
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