454 lines
13 KiB
C
454 lines
13 KiB
C
/*
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* Copyright (c) 1987, 1991, 1993
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* The Regents of the University of California. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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 REGENTS 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 REGENTS 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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* @(#)kern_malloc.c 8.3 (Berkeley) 1/4/94
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* $Id: kern_malloc.c,v 1.47 1998/08/16 01:21:51 bde Exp $
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*/
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#include "opt_vm.h"
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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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#define MALLOC_INSTANTIATE
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/vmmeter.h>
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#include <sys/lock.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_extern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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static void kmeminit __P((void *));
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static void malloc_init __P((struct malloc_type *));
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SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_FIRST, kmeminit, NULL)
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static MALLOC_DEFINE(M_FREE, "free", "should be on free list");
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static struct malloc_type *kmemstatistics = M_FREE;
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static struct kmembuckets bucket[MINBUCKET + 16];
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static struct kmemusage *kmemusage;
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static char *kmembase;
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static char *kmemlimit;
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static int vm_kmem_size;
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#ifdef DIAGNOSTIC
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/*
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* This structure provides a set of masks to catch unaligned frees.
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*/
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static long addrmask[] = { 0,
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0x00000001, 0x00000003, 0x00000007, 0x0000000f,
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0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff,
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0x000001ff, 0x000003ff, 0x000007ff, 0x00000fff,
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0x00001fff, 0x00003fff, 0x00007fff, 0x0000ffff,
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};
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/*
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* The WEIRD_ADDR is used as known text to copy into free objects so
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* that modifications after frees can be detected.
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*/
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#define WEIRD_ADDR 0xdeadc0de
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#define MAX_COPY 64
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/*
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* Normally the first word of the structure is used to hold the list
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* pointer for free objects. However, when running with diagnostics,
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* we use the third and fourth fields, so as to catch modifications
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* in the most commonly trashed first two words.
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*/
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struct freelist {
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long spare0;
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struct malloc_type *type;
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long spare1;
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caddr_t next;
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};
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#else /* !DIAGNOSTIC */
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struct freelist {
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caddr_t next;
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};
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#endif /* DIAGNOSTIC */
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/*
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* Allocate a block of memory
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*/
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void *
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malloc(size, type, flags)
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unsigned long size;
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struct malloc_type *type;
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int flags;
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{
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register struct kmembuckets *kbp;
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register struct kmemusage *kup;
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register struct freelist *freep;
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long indx, npg, allocsize;
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int s;
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caddr_t va, cp, savedlist;
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#ifdef DIAGNOSTIC
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long *end, *lp;
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int copysize;
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char *savedtype;
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#endif
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register struct malloc_type *ksp = type;
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if (!type->ks_next)
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malloc_init(type);
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indx = BUCKETINDX(size);
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kbp = &bucket[indx];
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s = splmem();
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while (ksp->ks_memuse >= ksp->ks_limit) {
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if (flags & M_NOWAIT) {
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splx(s);
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return ((void *) NULL);
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}
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if (ksp->ks_limblocks < 65535)
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ksp->ks_limblocks++;
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tsleep((caddr_t)ksp, PSWP+2, type->ks_shortdesc, 0);
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}
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ksp->ks_size |= 1 << indx;
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#ifdef DIAGNOSTIC
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copysize = 1 << indx < MAX_COPY ? 1 << indx : MAX_COPY;
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#endif
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if (kbp->kb_next == NULL) {
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kbp->kb_last = NULL;
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if (size > MAXALLOCSAVE)
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allocsize = roundup(size, PAGE_SIZE);
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else
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allocsize = 1 << indx;
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npg = btoc(allocsize);
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va = (caddr_t) kmem_malloc(kmem_map, (vm_size_t)ctob(npg), flags);
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if (va == NULL) {
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splx(s);
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return ((void *) NULL);
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}
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kbp->kb_total += kbp->kb_elmpercl;
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kup = btokup(va);
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kup->ku_indx = indx;
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if (allocsize > MAXALLOCSAVE) {
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if (npg > 65535)
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panic("malloc: allocation too large");
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kup->ku_pagecnt = npg;
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ksp->ks_memuse += allocsize;
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goto out;
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}
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kup->ku_freecnt = kbp->kb_elmpercl;
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kbp->kb_totalfree += kbp->kb_elmpercl;
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/*
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* Just in case we blocked while allocating memory,
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* and someone else also allocated memory for this
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* bucket, don't assume the list is still empty.
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*/
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savedlist = kbp->kb_next;
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kbp->kb_next = cp = va + (npg * PAGE_SIZE) - allocsize;
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for (;;) {
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freep = (struct freelist *)cp;
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#ifdef DIAGNOSTIC
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/*
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* Copy in known text to detect modification
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* after freeing.
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*/
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end = (long *)&cp[copysize];
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for (lp = (long *)cp; lp < end; lp++)
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*lp = WEIRD_ADDR;
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freep->type = M_FREE;
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#endif /* DIAGNOSTIC */
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if (cp <= va)
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break;
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cp -= allocsize;
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freep->next = cp;
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}
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freep->next = savedlist;
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if (kbp->kb_last == NULL)
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kbp->kb_last = (caddr_t)freep;
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}
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va = kbp->kb_next;
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kbp->kb_next = ((struct freelist *)va)->next;
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#ifdef DIAGNOSTIC
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freep = (struct freelist *)va;
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savedtype = (char *) type->ks_shortdesc;
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#if BYTE_ORDER == BIG_ENDIAN
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freep->type = (struct malloc_type *)WEIRD_ADDR >> 16;
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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freep->type = (struct malloc_type *)WEIRD_ADDR;
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#endif
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if ((intptr_t)(void *)&freep->next & 0x2)
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freep->next = (caddr_t)((WEIRD_ADDR >> 16)|(WEIRD_ADDR << 16));
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else
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freep->next = (caddr_t)WEIRD_ADDR;
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end = (long *)&va[copysize];
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for (lp = (long *)va; lp < end; lp++) {
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if (*lp == WEIRD_ADDR)
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continue;
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printf("%s %ld of object %p size %lu %s %s (0x%lx != 0x%lx)\n",
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"Data modified on freelist: word",
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(long)(lp - (long *)va), (void *)va, size,
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"previous type", savedtype, *lp, (u_long)WEIRD_ADDR);
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break;
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}
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freep->spare0 = 0;
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#endif /* DIAGNOSTIC */
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kup = btokup(va);
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if (kup->ku_indx != indx)
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panic("malloc: wrong bucket");
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if (kup->ku_freecnt == 0)
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panic("malloc: lost data");
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kup->ku_freecnt--;
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kbp->kb_totalfree--;
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ksp->ks_memuse += 1 << indx;
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out:
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kbp->kb_calls++;
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ksp->ks_inuse++;
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ksp->ks_calls++;
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if (ksp->ks_memuse > ksp->ks_maxused)
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ksp->ks_maxused = ksp->ks_memuse;
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splx(s);
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return ((void *) va);
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}
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/*
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* Free a block of memory allocated by malloc.
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*/
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void
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free(addr, type)
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void *addr;
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struct malloc_type *type;
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{
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register struct kmembuckets *kbp;
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register struct kmemusage *kup;
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register struct freelist *freep;
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long size;
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int s;
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#ifdef DIAGNOSTIC
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struct freelist *fp;
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long *end, *lp, alloc, copysize;
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#endif
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register struct malloc_type *ksp = type;
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if (!type->ks_next)
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panic("freeing with unknown type (%s)", type->ks_shortdesc);
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#ifdef DIAGNOSTIC
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if ((char *)addr < kmembase || (char *)addr >= kmemlimit) {
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panic("free: address %p out of range", (void *)addr);
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}
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#endif
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kup = btokup(addr);
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size = 1 << kup->ku_indx;
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kbp = &bucket[kup->ku_indx];
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s = splmem();
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#ifdef DIAGNOSTIC
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/*
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* Check for returns of data that do not point to the
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* beginning of the allocation.
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*/
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if (size > PAGE_SIZE)
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alloc = addrmask[BUCKETINDX(PAGE_SIZE)];
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else
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alloc = addrmask[kup->ku_indx];
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if (((uintptr_t)(void *)addr & alloc) != 0)
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panic("free: unaligned addr %p, size %ld, type %s, mask %ld",
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(void *)addr, size, type->ks_shortdesc, alloc);
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#endif /* DIAGNOSTIC */
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if (size > MAXALLOCSAVE) {
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kmem_free(kmem_map, (vm_offset_t)addr, ctob(kup->ku_pagecnt));
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size = kup->ku_pagecnt << PAGE_SHIFT;
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ksp->ks_memuse -= size;
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kup->ku_indx = 0;
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kup->ku_pagecnt = 0;
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if (ksp->ks_memuse + size >= ksp->ks_limit &&
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ksp->ks_memuse < ksp->ks_limit)
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wakeup((caddr_t)ksp);
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ksp->ks_inuse--;
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kbp->kb_total -= 1;
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splx(s);
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return;
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}
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freep = (struct freelist *)addr;
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#ifdef DIAGNOSTIC
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/*
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* Check for multiple frees. Use a quick check to see if
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* it looks free before laboriously searching the freelist.
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*/
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if (freep->spare0 == WEIRD_ADDR) {
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fp = (struct freelist *)kbp->kb_next;
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while (fp) {
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if (fp->spare0 != WEIRD_ADDR) {
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printf("trashed free item %p\n", fp);
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panic("free: free item modified");
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} else if (addr == (caddr_t)fp) {
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printf("multiple freed item %p\n", addr);
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panic("free: multiple free");
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}
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fp = (struct freelist *)fp->next;
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}
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}
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/*
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* Copy in known text to detect modification after freeing
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* and to make it look free. Also, save the type being freed
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* so we can list likely culprit if modification is detected
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* when the object is reallocated.
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*/
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copysize = size < MAX_COPY ? size : MAX_COPY;
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end = (long *)&((caddr_t)addr)[copysize];
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for (lp = (long *)addr; lp < end; lp++)
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*lp = WEIRD_ADDR;
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freep->type = type;
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#endif /* DIAGNOSTIC */
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kup->ku_freecnt++;
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if (kup->ku_freecnt >= kbp->kb_elmpercl)
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if (kup->ku_freecnt > kbp->kb_elmpercl)
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panic("free: multiple frees");
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else if (kbp->kb_totalfree > kbp->kb_highwat)
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kbp->kb_couldfree++;
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kbp->kb_totalfree++;
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ksp->ks_memuse -= size;
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if (ksp->ks_memuse + size >= ksp->ks_limit &&
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ksp->ks_memuse < ksp->ks_limit)
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wakeup((caddr_t)ksp);
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ksp->ks_inuse--;
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#ifdef OLD_MALLOC_MEMORY_POLICY
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if (kbp->kb_next == NULL)
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kbp->kb_next = addr;
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else
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((struct freelist *)kbp->kb_last)->next = addr;
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freep->next = NULL;
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kbp->kb_last = addr;
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#else
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/*
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* Return memory to the head of the queue for quick reuse. This
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* can improve performance by improving the probability of the
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* item being in the cache when it is reused.
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*/
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if (kbp->kb_next == NULL) {
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kbp->kb_next = addr;
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kbp->kb_last = addr;
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freep->next = NULL;
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} else {
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freep->next = kbp->kb_next;
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kbp->kb_next = addr;
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}
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#endif
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splx(s);
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}
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/*
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* Initialize the kernel memory allocator
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*/
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/* ARGSUSED*/
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static void
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kmeminit(dummy)
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void *dummy;
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{
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register long indx;
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int npg;
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int mem_size;
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#if ((MAXALLOCSAVE & (MAXALLOCSAVE - 1)) != 0)
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#error "kmeminit: MAXALLOCSAVE not power of 2"
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#endif
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#if (MAXALLOCSAVE > MINALLOCSIZE * 32768)
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#error "kmeminit: MAXALLOCSAVE too big"
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#endif
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#if (MAXALLOCSAVE < PAGE_SIZE)
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#error "kmeminit: MAXALLOCSAVE too small"
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#endif
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/*
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* Try to auto-tune the kernel memory size, so that it is
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* more applicable for a wider range of machine sizes.
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* On an X86, a VM_KMEM_SIZE_SCALE value of 4 is good, while
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* a VM_KMEM_SIZE of 12MB is a fair compromise. The
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* VM_KMEM_SIZE_MAX is dependent on the maximum KVA space
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* available, and on an X86 with a total KVA space of 256MB,
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* try to keep VM_KMEM_SIZE_MAX at 80MB or below.
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*
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* Note that the kmem_map is also used by the zone allocator,
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* so make sure that there is enough space.
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*/
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vm_kmem_size = VM_KMEM_SIZE;
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mem_size = cnt.v_page_count * PAGE_SIZE;
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#if defined(VM_KMEM_SIZE_SCALE)
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if ((mem_size / VM_KMEM_SIZE_SCALE) > vm_kmem_size)
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vm_kmem_size = mem_size / VM_KMEM_SIZE_SCALE;
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#endif
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#if defined(VM_KMEM_SIZE_MAX)
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if (vm_kmem_size >= VM_KMEM_SIZE_MAX)
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vm_kmem_size = VM_KMEM_SIZE_MAX;
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#endif
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if (vm_kmem_size > 2 * (cnt.v_page_count * PAGE_SIZE))
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vm_kmem_size = 2 * (cnt.v_page_count * PAGE_SIZE);
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npg = (nmbufs * MSIZE + nmbclusters * MCLBYTES + vm_kmem_size)
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/ PAGE_SIZE;
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kmemusage = (struct kmemusage *) kmem_alloc(kernel_map,
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(vm_size_t)(npg * sizeof(struct kmemusage)));
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kmem_map = kmem_suballoc(kernel_map, (vm_offset_t *)&kmembase,
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(vm_offset_t *)&kmemlimit, (vm_size_t)(npg * PAGE_SIZE));
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kmem_map->system_map = 1;
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for (indx = 0; indx < MINBUCKET + 16; indx++) {
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if (1 << indx >= PAGE_SIZE)
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bucket[indx].kb_elmpercl = 1;
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else
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bucket[indx].kb_elmpercl = PAGE_SIZE / (1 << indx);
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bucket[indx].kb_highwat = 5 * bucket[indx].kb_elmpercl;
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}
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}
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static void
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malloc_init(type)
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struct malloc_type *type;
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{
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if (type->ks_magic != M_MAGIC)
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panic("malloc type lacks magic");
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if (cnt.v_page_count == 0)
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panic("malloc_init not allowed before vm init");
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/*
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* The default limits for each malloc region is 1/2 of the
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* malloc portion of the kmem map size.
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*/
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type->ks_limit = vm_kmem_size / 2;
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type->ks_next = kmemstatistics;
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kmemstatistics = type;
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}
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