166 lines
4.4 KiB
C
166 lines
4.4 KiB
C
/* $NetBSD: rf_alloclist.c,v 1.16 2003/12/31 16:32:50 oster Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/****************************************************************************
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*
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* Alloclist.c -- code to manipulate allocation lists
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*
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* an allocation list is just a list of AllocListElem structures. Each
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* such structure contains a fixed-size array of pointers. Calling
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* FreeAList() causes each pointer to be freed.
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*
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***************************************************************************/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rf_alloclist.c,v 1.16 2003/12/31 16:32:50 oster Exp $");
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#include <dev/raidframe/raidframevar.h>
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#include "rf_options.h"
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#include "rf_threadstuff.h"
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#include "rf_alloclist.h"
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#include "rf_debugMem.h"
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#include "rf_etimer.h"
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#include "rf_general.h"
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#include "rf_shutdown.h"
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static unsigned int fl_hit_count, fl_miss_count;
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static RF_AllocListElem_t *al_free_list = NULL;
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static int al_free_list_count;
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#define RF_AL_FREELIST_MAX 256
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static void rf_ShutdownAllocList(void *);
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static void rf_ShutdownAllocList(void *ignored)
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{
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RF_AllocListElem_t *p, *pt;
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for (p = al_free_list; p;) {
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pt = p;
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p = p->next;
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RF_Free(pt, sizeof(*pt));
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}
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/*
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printf("Alloclist: Free list hit count %lu (%lu %%) miss count %lu (%lu %%)\n",
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fl_hit_count, (100*fl_hit_count)/(fl_hit_count+fl_miss_count),
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fl_miss_count, (100*fl_miss_count)/(fl_hit_count+fl_miss_count));
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*/
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}
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int
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rf_ConfigureAllocList(RF_ShutdownList_t **listp)
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{
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int rc;
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al_free_list = NULL;
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fl_hit_count = fl_miss_count = al_free_list_count = 0;
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rc = rf_ShutdownCreate(listp, rf_ShutdownAllocList, NULL);
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if (rc) {
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rf_print_unable_to_add_shutdown( __FILE__, __LINE__, rc);
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return (rc);
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}
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return (0);
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}
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/* we expect the lists to have at most one or two elements, so we're willing
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* to search for the end. If you ever observe the lists growing longer,
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* increase POINTERS_PER_ALLOC_LIST_ELEMENT.
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*/
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void
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rf_real_AddToAllocList(RF_AllocListElem_t *l, void *p, int size)
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{
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RF_AllocListElem_t *newelem;
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for (; l->next; l = l->next)
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RF_ASSERT(l->numPointers == RF_POINTERS_PER_ALLOC_LIST_ELEMENT); /* find end of list */
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RF_ASSERT(l->numPointers >= 0 && l->numPointers <= RF_POINTERS_PER_ALLOC_LIST_ELEMENT);
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if (l->numPointers == RF_POINTERS_PER_ALLOC_LIST_ELEMENT) {
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newelem = rf_real_MakeAllocList();
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l->next = newelem;
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l = newelem;
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}
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l->pointers[l->numPointers] = p;
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l->sizes[l->numPointers] = size;
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l->numPointers++;
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}
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void
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rf_FreeAllocList(RF_AllocListElem_t *l)
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{
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int i;
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RF_AllocListElem_t *temp, *p;
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for (p = l; p; p = p->next) {
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RF_ASSERT(p->numPointers >= 0 &&
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p->numPointers <= RF_POINTERS_PER_ALLOC_LIST_ELEMENT);
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for (i = 0; i < p->numPointers; i++) {
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RF_ASSERT(p->pointers[i]);
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RF_Free(p->pointers[i], p->sizes[i]);
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}
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}
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while (l) {
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temp = l;
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l = l->next;
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if (al_free_list_count > RF_AL_FREELIST_MAX) {
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RF_Free(temp, sizeof(*temp));
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} else {
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temp->next = al_free_list;
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al_free_list = temp;
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al_free_list_count++;
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}
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}
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}
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RF_AllocListElem_t *
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rf_real_MakeAllocList()
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{
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RF_AllocListElem_t *p;
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if (al_free_list) {
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fl_hit_count++;
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p = al_free_list;
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al_free_list = p->next;
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al_free_list_count--;
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} else {
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fl_miss_count++;
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RF_Malloc(p, sizeof(RF_AllocListElem_t),
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(RF_AllocListElem_t *));
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/* no allocation locking in kernel, so this is fine */
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}
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if (p == NULL) {
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return (NULL);
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}
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memset((char *) p, 0, sizeof(RF_AllocListElem_t));
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return (p);
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}
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