92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/*
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* Copyright (c) 2003 The FreeBSD Project
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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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*
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <vm/uma.h>
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#include <vm/uma_int.h>
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#include <machine/vmparam.h>
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static int hw_uma_mdpages;
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SYSCTL_INT(_hw, OID_AUTO, uma_mdpages, CTLFLAG_RD, &hw_uma_mdpages, 0,
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"UMA MD pages in use");
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void *
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uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
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{
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static vm_pindex_t color;
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void *va;
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vm_page_t m;
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int pflags;
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*flags = UMA_SLAB_PRIV;
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if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
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pflags = VM_ALLOC_INTERRUPT;
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else
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pflags = VM_ALLOC_SYSTEM;
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if (wait & M_ZERO)
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pflags |= VM_ALLOC_ZERO;
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for (;;) {
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m = vm_page_alloc(NULL, color++, pflags | VM_ALLOC_NOOBJ);
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if (m == NULL) {
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if (wait & M_NOWAIT)
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return (NULL);
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VM_WAIT;
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} else
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break;
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}
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va = (void *) VM_PAGE_TO_PHYS(m);
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if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
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bzero(va, PAGE_SIZE);
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atomic_add_int(&hw_uma_mdpages, 1);
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return (va);
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}
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void
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uma_small_free(void *mem, int size, u_int8_t flags)
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{
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vm_page_t m;
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m = PHYS_TO_VM_PAGE((u_int32_t)mem);
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vm_page_lock_queues();
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vm_page_free(m);
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vm_page_unlock_queues();
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atomic_subtract_int(&hw_uma_mdpages, 1);
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}
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