diff options
Diffstat (limited to 'zfs/lib/libumem/vmem_stand.c')
| -rw-r--r-- | zfs/lib/libumem/vmem_stand.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/zfs/lib/libumem/vmem_stand.c b/zfs/lib/libumem/vmem_stand.c deleted file mode 100644 index da19043df..000000000 --- a/zfs/lib/libumem/vmem_stand.c +++ /dev/null @@ -1,164 +0,0 @@ -/* - * CDDL HEADER START - * - * The contents of this file are subject to the terms of the - * Common Development and Distribution License, Version 1.0 only - * (the "License"). You may not use this file except in compliance - * with the License. - * - * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE - * or http://www.opensolaris.org/os/licensing. - * See the License for the specific language governing permissions - * and limitations under the License. - * - * When distributing Covered Code, include this CDDL HEADER in each - * file and include the License file at usr/src/OPENSOLARIS.LICENSE. - * If applicable, add the following below this CDDL HEADER, with the - * fields enclosed by brackets "[]" replaced with your own identifying - * information: Portions Copyright [yyyy] [name of copyright owner] - * - * CDDL HEADER END - */ -/* - * Copyright 2004 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - */ - -#pragma ident "%Z%%M% %I% %E% SMI" - -/* - * Standalone-specific vmem routines - * - * The standalone allocator operates on a pre-existing blob of memory, the - * location and dimensions of which are set using vmem_stand_setsize(). We - * then hand out CHUNKSIZE-sized pieces of this blob, until we run out. - */ - -#define DEF_CHUNKSIZE (64 * 1024) /* 64K */ - -#define DEF_NREGIONS 2 - -#include <errno.h> -#include <limits.h> -#include <sys/sysmacros.h> -#include <sys/mman.h> -#include <unistd.h> -#include <strings.h> - -#include "vmem_base.h" -#include "misc.h" - -static vmem_t *stand_heap; - -static size_t stand_chunksize; - -typedef struct stand_region { - caddr_t sr_base; - caddr_t sr_curtop; - size_t sr_left; -} stand_region_t; - -static stand_region_t stand_regions[DEF_NREGIONS]; -static int stand_nregions; - -extern void membar_producer(void); - -void -vmem_stand_init(void) -{ - stand_chunksize = MAX(DEF_CHUNKSIZE, pagesize); - - stand_nregions = 0; -} - -int -vmem_stand_add(caddr_t base, size_t len) -{ - stand_region_t *sr = &stand_regions[stand_nregions]; - - ASSERT(pagesize != 0); - - if (stand_nregions == DEF_NREGIONS) { - errno = ENOSPC; - return (-1); /* we don't have room -- throw it back */ - } - - /* - * We guarantee that only one call to `vmem_stand_add' will be - * active at a time, but we can't ensure that the allocator won't be - * in use while this function is being called. As such, we have to - * ensure that sr is populated and visible to other processors before - * allowing the allocator to access the new region. - */ - sr->sr_base = base; - sr->sr_curtop = (caddr_t)P2ROUNDUP((ulong_t)base, stand_chunksize); - sr->sr_left = P2ALIGN(len - (size_t)(sr->sr_curtop - sr->sr_base), - stand_chunksize); - membar_producer(); - - stand_nregions++; - - return (0); -} - -static void * -stand_parent_alloc(vmem_t *src, size_t size, int vmflags) -{ - int old_errno = errno; - stand_region_t *sr; - size_t chksize; - void *ret; - int i; - - if ((ret = vmem_alloc(src, size, VM_NOSLEEP)) != NULL) { - errno = old_errno; - return (ret); - } - - /* We need to allocate another chunk */ - chksize = roundup(size, stand_chunksize); - - for (sr = stand_regions, i = 0; i < stand_nregions; i++, sr++) { - if (sr->sr_left >= chksize) - break; - } - - if (i == stand_nregions) { - /* - * We don't have enough in any of our regions to satisfy the - * request. - */ - errno = old_errno; - return (NULL); - } - - if ((ret = _vmem_extend_alloc(src, sr->sr_curtop, chksize, size, - vmflags)) == NULL) { - errno = old_errno; - return (NULL); - } - - bzero(sr->sr_curtop, chksize); - - sr->sr_curtop += chksize; - sr->sr_left -= chksize; - - return (ret); -} - -vmem_t * -vmem_stand_arena(vmem_alloc_t **a_out, vmem_free_t **f_out) -{ - ASSERT(stand_nregions == 1); - - stand_heap = vmem_init("stand_parent", stand_chunksize, - stand_parent_alloc, vmem_free, - "stand_heap", NULL, 0, pagesize, vmem_alloc, vmem_free); - - if (a_out != NULL) - *a_out = vmem_alloc; - if (f_out != NULL) - *f_out = vmem_free; - - return (stand_heap); -} |