495 lines
13 KiB
C
495 lines
13 KiB
C
/* $NetBSD: kern_malloc.c,v 1.20 1996/08/27 20:01:42 cgd Exp $ */
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/*
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* Copyright 1996 Christopher G. Demetriou. All rights reserved.
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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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*/
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/map.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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struct kmembuckets bucket[MINBUCKET + 16];
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struct kmemstats kmemstats[M_LAST];
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struct kmemusage *kmemusage;
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char *kmembase, *kmemlimit;
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char *memname[] = INITKMEMNAMES;
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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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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 ((unsigned) 0xdeadbeef)
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#define MAX_COPY 32
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/*
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* Normally the freelist structure is used only to hold the list pointer
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* for free objects. However, when running with diagnostics, the first
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* 8 bytes of the structure is unused except for diagnostic information,
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* and the free list pointer is at offst 8 in the structure. Since the
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* first 8 bytes is the portion of the structure most often modified, this
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* helps to detect memory reuse problems and avoid free list corruption.
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*/
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struct freelist {
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int32_t spare0;
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int16_t type;
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int16_t 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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int type, 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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int32_t *end, *lp;
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int copysize;
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char *savedtype;
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#endif
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#ifdef KMEMSTATS
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register struct kmemstats *ksp = &kmemstats[type];
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if (((unsigned long)type) > M_LAST)
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panic("malloc - bogus type");
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#endif
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indx = BUCKETINDX(size);
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kbp = &bucket[indx];
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s = splimp();
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#ifdef KMEMSTATS
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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, memname[type], 0);
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}
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ksp->ks_size |= 1 << indx;
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#endif
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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, CLBYTES);
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else
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allocsize = 1 << indx;
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npg = clrnd(btoc(allocsize));
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va = (caddr_t) kmem_malloc(kmem_map, (vm_size_t)ctob(npg),
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!(flags & M_NOWAIT));
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if (va == NULL) {
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/*
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* Kmem_malloc() can return NULL, even if it can
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* wait, if there is no map space avaiable, because
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* it can't fix that problem. Neither can we,
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* right now. (We should release pages which
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* are completely free and which are in buckets
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* with too many free elements.)
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*/
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if ((flags & M_NOWAIT) == 0)
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panic("malloc: out of space in kmem_map");
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splx(s);
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return ((void *) NULL);
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}
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#ifdef KMEMSTATS
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kbp->kb_total += kbp->kb_elmpercl;
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#endif
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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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#ifdef KMEMSTATS
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ksp->ks_memuse += allocsize;
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#endif
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goto out;
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}
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#ifdef KMEMSTATS
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kup->ku_freecnt = kbp->kb_elmpercl;
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kbp->kb_totalfree += kbp->kb_elmpercl;
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#endif
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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 * NBPG) - 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 = (int32_t *)&cp[copysize];
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for (lp = (int32_t *)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 = (unsigned)freep->type < M_LAST ?
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memname[freep->type] : "???";
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if (kbp->kb_next &&
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!kernacc(kbp->kb_next, sizeof(struct freelist), 0)) {
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printf("%s %ld of object %p size %ld %s %s (invalid addr %p)\n",
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"Data modified on freelist: word",
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(long)((int32_t *)&kbp->kb_next - (int32_t *)kbp),
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va, size, "previous type", savedtype, kbp->kb_next);
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kbp->kb_next = NULL;
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}
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/* Fill the fields that we've used with WEIRD_ADDR */
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#if BYTE_ORDER == BIG_ENDIAN
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freep->type = WEIRD_ADDR >> 16;
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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freep->type = (short)WEIRD_ADDR;
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#endif
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end = (int32_t *)&freep->next +
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(sizeof(freep->next) / sizeof(int32_t));
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for (lp = (int32_t *)&freep->next; lp < end; lp++)
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*lp = WEIRD_ADDR;
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/* and check that the data hasn't been modified. */
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end = (int32_t *)&va[copysize];
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for (lp = (int32_t *)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 %ld %s %s (0x%x != 0x%x)\n",
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"Data modified on freelist: word",
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(long)(lp - (int32_t *)va), va, size, "previous type",
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savedtype, *lp, 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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#ifdef KMEMSTATS
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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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#else
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out:
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#endif
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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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int 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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caddr_t cp;
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int32_t *end, *lp;
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long alloc, copysize;
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#endif
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#ifdef KMEMSTATS
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register struct kmemstats *ksp = &kmemstats[type];
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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 = splimp();
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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 > NBPG * CLSIZE)
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alloc = addrmask[BUCKETINDX(NBPG * CLSIZE)];
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else
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alloc = addrmask[kup->ku_indx];
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if (((u_long)addr & alloc) != 0)
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panic("free: unaligned addr %p, size %ld, type %s, mask %ld\n",
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addr, size, memname[type], 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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#ifdef KMEMSTATS
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size = kup->ku_pagecnt << PGSHIFT;
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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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#endif
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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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for (cp = kbp->kb_next; cp;
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cp = ((struct freelist *)cp)->next) {
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if (addr != cp)
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continue;
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printf("multiply freed item %p\n", addr);
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panic("free: duplicated free");
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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 = (int32_t *)&((caddr_t)addr)[copysize];
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for (lp = (int32_t *)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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#ifdef KMEMSTATS
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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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#endif
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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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splx(s);
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}
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/*
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* Change the size of a block of memory.
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*/
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void *
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realloc(curaddr, newsize, type, flags)
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void *curaddr;
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unsigned long newsize;
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int type, flags;
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{
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register struct kmemusage *kup;
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long cursize;
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void *newaddr;
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#ifdef DIAGNOSTIC
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long alloc;
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#endif
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/*
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* Realloc() with a NULL pointer is the same as malloc().
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*/
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if (curaddr == NULL)
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return (malloc(newsize, type, flags));
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/*
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* Realloc() with zero size is the same as free().
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*/
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if (newsize == 0) {
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free(curaddr, type);
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return (NULL);
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}
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/*
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* Find out how large the old allocation was (and do some
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* sanity checking).
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*/
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kup = btokup(curaddr);
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cursize = 1 << kup->ku_indx;
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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 (cursize > NBPG * CLSIZE)
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alloc = addrmask[BUCKETINDX(NBPG * CLSIZE)];
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else
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alloc = addrmask[kup->ku_indx];
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if (((u_long)curaddr & alloc) != 0)
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panic("realloc: unaligned addr %p, size %ld, type %s, mask %ld\n",
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curaddr, cursize, memname[type], alloc);
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#endif /* DIAGNOSTIC */
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if (cursize > MAXALLOCSAVE)
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cursize = ctob(kup->ku_pagecnt);
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/*
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* If we already actually have as much as they want, we're done.
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*/
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if (newsize <= cursize)
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return (curaddr);
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/*
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* Can't satisfy the allocation with the existing block.
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* Allocate a new one and copy the data.
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*/
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newaddr = malloc(newsize, type, flags);
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if (newaddr == NULL) {
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/*
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* Malloc() failed, because flags included M_NOWAIT.
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* Return NULL to indicate that failure. The old
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* pointer is still valid.
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*/
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return NULL;
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}
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bcopy(curaddr, newaddr, cursize);
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/*
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* We were successful: free the old allocation and return
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* the new one.
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*/
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free(curaddr, type);
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return (newaddr);
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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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void
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kmeminit()
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{
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register long indx;
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int npg;
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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 < CLBYTES)
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ERROR!_kmeminit:_MAXALLOCSAVE_too_small
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#endif
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if (sizeof(struct freelist) > (1 << MINBUCKET))
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panic("minbucket too small/struct freelist too big");
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npg = VM_KMEM_SIZE/ NBPG;
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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 * NBPG), FALSE);
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#ifdef KMEMSTATS
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for (indx = 0; indx < MINBUCKET + 16; indx++) {
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if (1 << indx >= CLBYTES)
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bucket[indx].kb_elmpercl = 1;
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else
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bucket[indx].kb_elmpercl = CLBYTES / (1 << indx);
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bucket[indx].kb_highwat = 5 * bucket[indx].kb_elmpercl;
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}
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for (indx = 0; indx < M_LAST; indx++)
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kmemstats[indx].ks_limit = npg * NBPG * 6 / 10;
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#endif
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}
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