Annotation of sys/dev/raidframe/rf_alloclist.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: rf_alloclist.c,v 1.4 2002/12/16 07:01:03 tdeval Exp $ */
! 2: /* $NetBSD: rf_alloclist.c,v 1.4 1999/08/13 03:41:53 oster Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1995 Carnegie-Mellon University.
! 6: * All rights reserved.
! 7: *
! 8: * Author: Mark Holland
! 9: *
! 10: * Permission to use, copy, modify and distribute this software and
! 11: * its documentation is hereby granted, provided that both the copyright
! 12: * notice and this permission notice appear in all copies of the
! 13: * software, derivative works or modified versions, and any portions
! 14: * thereof, and that both notices appear in supporting documentation.
! 15: *
! 16: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
! 17: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
! 18: * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
! 19: *
! 20: * Carnegie Mellon requests users of this software to return to
! 21: *
! 22: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
! 23: * School of Computer Science
! 24: * Carnegie Mellon University
! 25: * Pittsburgh PA 15213-3890
! 26: *
! 27: * any improvements or extensions that they make and grant Carnegie the
! 28: * rights to redistribute these changes.
! 29: */
! 30:
! 31: /****************************************************************************
! 32: *
! 33: * Alloclist.c -- Code to manipulate allocation lists.
! 34: *
! 35: * An allocation list is just a list of AllocListElem structures. Each
! 36: * such structure contains a fixed-size array of pointers. Calling
! 37: * FreeAList() causes each pointer to be freed.
! 38: *
! 39: ***************************************************************************/
! 40:
! 41: #include "rf_types.h"
! 42: #include "rf_threadstuff.h"
! 43: #include "rf_alloclist.h"
! 44: #include "rf_debugMem.h"
! 45: #include "rf_etimer.h"
! 46: #include "rf_general.h"
! 47: #include "rf_shutdown.h"
! 48:
! 49: RF_DECLARE_STATIC_MUTEX(alist_mutex);
! 50: static unsigned int fl_hit_count, fl_miss_count;
! 51:
! 52: static RF_AllocListElem_t *al_free_list = NULL;
! 53: static int al_free_list_count;
! 54:
! 55: #define RF_AL_FREELIST_MAX 256
! 56:
! 57: #define DO_FREE(_p,_sz) RF_Free((_p), (_sz))
! 58:
! 59: void rf_ShutdownAllocList(void *);
! 60:
! 61: void
! 62: rf_ShutdownAllocList(void *ignored)
! 63: {
! 64: RF_AllocListElem_t *p, *pt;
! 65:
! 66: for (p = al_free_list; p;) {
! 67: pt = p;
! 68: p = p->next;
! 69: DO_FREE(pt, sizeof(*pt));
! 70: }
! 71: rf_mutex_destroy(&alist_mutex);
! 72: /*
! 73: * printf("Alloclist: Free list hit count %lu (%lu %%) miss count %lu"
! 74: * " (%lu %%).\n", fl_hit_count,
! 75: * (100*fl_hit_count)/(fl_hit_count+fl_miss_count),
! 76: * fl_miss_count, (100*fl_miss_count)/(fl_hit_count+fl_miss_count));
! 77: */
! 78: }
! 79:
! 80: int
! 81: rf_ConfigureAllocList(RF_ShutdownList_t **listp)
! 82: {
! 83: int rc;
! 84:
! 85: rc = rf_mutex_init(&alist_mutex);
! 86: if (rc) {
! 87: RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d.\n",
! 88: __FILE__, __LINE__, rc);
! 89: return (rc);
! 90: }
! 91: al_free_list = NULL;
! 92: fl_hit_count = fl_miss_count = al_free_list_count = 0;
! 93: rc = rf_ShutdownCreate(listp, rf_ShutdownAllocList, NULL);
! 94: if (rc) {
! 95: RF_ERRORMSG3("Unable to add to shutdown list file %s line %d"
! 96: " rc=%d.\n", __FILE__, __LINE__, rc);
! 97: rf_mutex_destroy(&alist_mutex);
! 98: return (rc);
! 99: }
! 100: return (0);
! 101: }
! 102:
! 103:
! 104: /*
! 105: * We expect the lists to have at most one or two elements, so we're willing
! 106: * to search for the end. If you ever observe the lists growing longer,
! 107: * increase POINTERS_PER_ALLOC_LIST_ELEMENT.
! 108: */
! 109: void
! 110: rf_real_AddToAllocList(RF_AllocListElem_t *l, void *p, int size, int lockflag)
! 111: {
! 112: RF_AllocListElem_t *newelem;
! 113:
! 114: for (; l->next; l = l->next)
! 115: RF_ASSERT(l->numPointers == RF_POINTERS_PER_ALLOC_LIST_ELEMENT); /* Find end of list. */
! 116:
! 117: RF_ASSERT(l->numPointers >= 0 &&
! 118: l->numPointers <= RF_POINTERS_PER_ALLOC_LIST_ELEMENT);
! 119: if (l->numPointers == RF_POINTERS_PER_ALLOC_LIST_ELEMENT) {
! 120: newelem = rf_real_MakeAllocList(lockflag);
! 121: l->next = newelem;
! 122: l = newelem;
! 123: }
! 124: l->pointers[l->numPointers] = p;
! 125: l->sizes[l->numPointers] = size;
! 126: l->numPointers++;
! 127:
! 128: }
! 129:
! 130:
! 131: /*
! 132: * We use the debug_mem_mutex here because we need to lock it anyway to call
! 133: * free. This is probably a bug somewhere else in the code, but when I call
! 134: * malloc/free outside of any lock, I have endless trouble with malloc
! 135: * appearing to return the same pointer twice. Since we have to lock it
! 136: * anyway, we might as well use it as the lock around the al_free_list.
! 137: * Note that we can't call Free with the debug_mem_mutex locked.
! 138: */
! 139: void
! 140: rf_FreeAllocList(RF_AllocListElem_t *l)
! 141: {
! 142: int i;
! 143: RF_AllocListElem_t *temp, *p;
! 144:
! 145: for (p = l; p; p = p->next) {
! 146: RF_ASSERT(p->numPointers >= 0 &&
! 147: p->numPointers <= RF_POINTERS_PER_ALLOC_LIST_ELEMENT);
! 148: for (i = 0; i < p->numPointers; i++) {
! 149: RF_ASSERT(p->pointers[i]);
! 150: RF_Free(p->pointers[i], p->sizes[i]);
! 151: }
! 152: }
! 153: while (l) {
! 154: temp = l;
! 155: l = l->next;
! 156: if (al_free_list_count > RF_AL_FREELIST_MAX) {
! 157: DO_FREE(temp, sizeof(*temp));
! 158: } else {
! 159: temp->next = al_free_list;
! 160: al_free_list = temp;
! 161: al_free_list_count++;
! 162: }
! 163: }
! 164: }
! 165:
! 166: RF_AllocListElem_t *
! 167: rf_real_MakeAllocList(int lockflag)
! 168: {
! 169: RF_AllocListElem_t *p;
! 170:
! 171: if (al_free_list) {
! 172: fl_hit_count++;
! 173: p = al_free_list;
! 174: al_free_list = p->next;
! 175: al_free_list_count--;
! 176: } else {
! 177: fl_miss_count++;
! 178: RF_Malloc(p, sizeof(RF_AllocListElem_t),
! 179: (RF_AllocListElem_t *)); /*
! 180: * No allocation locking
! 181: * in kernel, so this is
! 182: * fine.
! 183: */
! 184: }
! 185: if (p == NULL) {
! 186: return (NULL);
! 187: }
! 188: bzero((char *) p, sizeof(RF_AllocListElem_t));
! 189: return (p);
! 190: }
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