257 lines
7.1 KiB
C
257 lines
7.1 KiB
C
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/*
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* Copyright (c) 1987, 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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 7.25 (Berkeley) 5/8/91
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*/
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#include "param.h"
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#include "proc.h"
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#include "kernel.h"
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#include "malloc.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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/*
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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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long indx, npg, alloc, allocsize;
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int s;
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caddr_t va, cp, savedlist;
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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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#endif
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if (kbp->kb_next == 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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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 = va + (npg * NBPG) - allocsize;
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for (cp = kbp->kb_next; cp > va; cp -= allocsize)
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*(caddr_t *)cp = cp - allocsize;
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*(caddr_t *)cp = savedlist;
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}
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va = kbp->kb_next;
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kbp->kb_next = *(caddr_t *)va;
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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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#ifdef DIAGNOSTIC
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long addrmask[] = { 0x00000000,
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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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#endif /* DIAGNOSTIC */
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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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long alloc, size;
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int s;
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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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#ifdef DIAGNOSTIC
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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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printf("free: unaligned addr 0x%x, size %d, type %d, mask %d\n",
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addr, size, type, alloc);
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panic("free: unaligned addr");
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}
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#endif /* DIAGNOSTIC */
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kbp = &bucket[kup->ku_indx];
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s = splimp();
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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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#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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*(caddr_t *)addr = kbp->kb_next;
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kbp->kb_next = addr;
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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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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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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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