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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | /* * Copyright (C) 1995-1997 Claus-Justus Heine. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. * * $Source: /homes/cvs/ftape-stacked/ftape/zftape/zftape-buffers.c,v $ * $Revision: 1.2 $ * $Date: 1997/10/05 19:18:59 $ * * This file contains the dynamic buffer allocation routines * of zftape */ #include <linux/errno.h> #include <linux/mm.h> #include <linux/malloc.h> #include <asm/segment.h> #include <linux/zftape.h> #if LINUX_VERSION_CODE >= KERNEL_VER(2,1,0) #include <linux/vmalloc.h> #endif #include "../zftape/zftape-init.h" #include "../zftape/zftape-eof.h" #include "../zftape/zftape-ctl.h" #include "../zftape/zftape-write.h" #include "../zftape/zftape-read.h" #include "../zftape/zftape-rw.h" #include "../zftape/zftape-vtbl.h" /* global variables */ /* local varibales */ static unsigned int used_memory = 0; static unsigned int peak_memory = 0; void zft_memory_stats(void) { TRACE_FUN(ft_t_flow); TRACE(ft_t_noise, "Memory usage (vmalloc allocations):\n" KERN_INFO "total allocated: %d\n" KERN_INFO "peak allocation: %d", used_memory, peak_memory); peak_memory = used_memory; TRACE_EXIT; } int zft_vcalloc_once(void *new, size_t size) { TRACE_FUN(ft_t_flow); if (zft_vmalloc_once(new, size) < 0) { TRACE_EXIT -ENOMEM; } memset(*(void **)new, '\0', size); TRACE_EXIT 0; } int zft_vmalloc_once(void *new, size_t size) { TRACE_FUN(ft_t_flow); if (*(void **)new != NULL || size == 0) { TRACE_EXIT 0; } if ((*(void **)new = vmalloc(size)) == NULL) { TRACE_EXIT -ENOMEM; } used_memory += size; if (peak_memory < used_memory) { peak_memory = used_memory; } TRACE_ABORT(0, ft_t_noise, "allocated buffer @ %p, %d bytes", *(void **)new, size); } int zft_vcalloc_always(void *new, size_t size) { TRACE_FUN(ft_t_flow); zft_vfree(new, size); TRACE_EXIT zft_vcalloc_once(new, size); } int zft_vmalloc_always(void *new, size_t size) { TRACE_FUN(ft_t_flow); zft_vfree(new, size); TRACE_EXIT zft_vmalloc_once(new, size); } void zft_vfree(void *old, size_t size) { TRACE_FUN(ft_t_flow); if (*(void **)old) { vfree(*(void **)old); used_memory -= size; TRACE(ft_t_noise, "released buffer @ %p, %d bytes", *(void **)old, size); *(void **)old = NULL; } TRACE_EXIT; } void *zft_kmalloc(size_t size) { void *new; while ((new = kmalloc(size, GFP_KERNEL)) == NULL) { current->state = TASK_INTERRUPTIBLE; schedule_timeout(HZ/10); } memset(new, 0, size); used_memory += size; if (peak_memory < used_memory) { peak_memory = used_memory; } return new; } void zft_kfree(void *old, size_t size) { kfree(old); used_memory -= size; } /* there are some more buffers that are allocated on demand. * cleanup_module() calles this function to be sure to have released * them */ void zft_uninit_mem(void) { TRACE_FUN(ft_t_flow); zft_vfree(&zft_hseg_buf, FT_SEGMENT_SIZE); zft_vfree(&zft_deblock_buf, FT_SEGMENT_SIZE); zft_deblock_segment = -1; zft_free_vtbl(); if (zft_cmpr_lock(0 /* don't load */) == 0) { (*zft_cmpr_ops->cleanup)(); (*zft_cmpr_ops->reset)(); /* unlock it again */ } zft_memory_stats(); TRACE_EXIT; } |