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rf_alloclist.c revision 1.16 
      1 /*	$NetBSD: rf_alloclist.c,v 1.16 2003/12/31 16:32:50 oster Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Mark Holland
      7  *
      8  * Permission to use, copy, modify and distribute this software and
      9  * its documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie the
     26  * rights to redistribute these changes.
     27  */
     28 
     29 /****************************************************************************
     30  *
     31  * Alloclist.c -- code to manipulate allocation lists
     32  *
     33  * an allocation list is just a list of AllocListElem structures.  Each
     34  * such structure contains a fixed-size array of pointers.  Calling
     35  * FreeAList() causes each pointer to be freed.
     36  *
     37  ***************************************************************************/
     38 
     39 #include <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: rf_alloclist.c,v 1.16 2003/12/31 16:32:50 oster Exp $");
     41 
     42 #include <dev/raidframe/raidframevar.h>
     43 
     44 #include "rf_options.h"
     45 #include "rf_threadstuff.h"
     46 #include "rf_alloclist.h"
     47 #include "rf_debugMem.h"
     48 #include "rf_etimer.h"
     49 #include "rf_general.h"
     50 #include "rf_shutdown.h"
     51 
     52 static unsigned int fl_hit_count, fl_miss_count;
     53 
     54 static RF_AllocListElem_t *al_free_list = NULL;
     55 static int al_free_list_count;
     56 
     57 #define RF_AL_FREELIST_MAX 256
     58 
     59 static void rf_ShutdownAllocList(void *);
     60 
     61 static void rf_ShutdownAllocList(void *ignored)
     62 {
     63 	RF_AllocListElem_t *p, *pt;
     64 
     65 	for (p = al_free_list; p;) {
     66 		pt = p;
     67 		p = p->next;
     68 		RF_Free(pt, sizeof(*pt));
     69 	}
     70 	/*
     71         printf("Alloclist: Free list hit count %lu (%lu %%) miss count %lu (%lu %%)\n",
     72 	       fl_hit_count, (100*fl_hit_count)/(fl_hit_count+fl_miss_count),
     73 	       fl_miss_count, (100*fl_miss_count)/(fl_hit_count+fl_miss_count));
     74         */
     75 }
     76 
     77 int
     78 rf_ConfigureAllocList(RF_ShutdownList_t **listp)
     79 {
     80 	int     rc;
     81 
     82 	al_free_list = NULL;
     83 	fl_hit_count = fl_miss_count = al_free_list_count = 0;
     84 	rc = rf_ShutdownCreate(listp, rf_ShutdownAllocList, NULL);
     85 	if (rc) {
     86 		rf_print_unable_to_add_shutdown( __FILE__, __LINE__, rc);
     87 		return (rc);
     88 	}
     89 	return (0);
     90 }
     91 
     92 
     93 /* we expect the lists to have at most one or two elements, so we're willing
     94  * to search for the end.  If you ever observe the lists growing longer,
     95  * increase POINTERS_PER_ALLOC_LIST_ELEMENT.
     96  */
     97 void
     98 rf_real_AddToAllocList(RF_AllocListElem_t *l, void *p, int size)
     99 {
    100 	RF_AllocListElem_t *newelem;
    101 
    102 	for (; l->next; l = l->next)
    103 		RF_ASSERT(l->numPointers == RF_POINTERS_PER_ALLOC_LIST_ELEMENT);	/* find end of list */
    104 
    105 	RF_ASSERT(l->numPointers >= 0 && l->numPointers <= RF_POINTERS_PER_ALLOC_LIST_ELEMENT);
    106 	if (l->numPointers == RF_POINTERS_PER_ALLOC_LIST_ELEMENT) {
    107 		newelem = rf_real_MakeAllocList();
    108 		l->next = newelem;
    109 		l = newelem;
    110 	}
    111 	l->pointers[l->numPointers] = p;
    112 	l->sizes[l->numPointers] = size;
    113 	l->numPointers++;
    114 
    115 }
    116 
    117 void
    118 rf_FreeAllocList(RF_AllocListElem_t *l)
    119 {
    120 	int     i;
    121 	RF_AllocListElem_t *temp, *p;
    122 
    123 	for (p = l; p; p = p->next) {
    124 		RF_ASSERT(p->numPointers >= 0 &&
    125 			  p->numPointers <= RF_POINTERS_PER_ALLOC_LIST_ELEMENT);
    126 		for (i = 0; i < p->numPointers; i++) {
    127 			RF_ASSERT(p->pointers[i]);
    128 			RF_Free(p->pointers[i], p->sizes[i]);
    129 		}
    130 	}
    131 	while (l) {
    132 		temp = l;
    133 		l = l->next;
    134 		if (al_free_list_count > RF_AL_FREELIST_MAX) {
    135 			RF_Free(temp, sizeof(*temp));
    136 		} else {
    137 			temp->next = al_free_list;
    138 			al_free_list = temp;
    139 			al_free_list_count++;
    140 		}
    141 	}
    142 }
    143 
    144 RF_AllocListElem_t *
    145 rf_real_MakeAllocList()
    146 {
    147 	RF_AllocListElem_t *p;
    148 
    149 	if (al_free_list) {
    150 		fl_hit_count++;
    151 		p = al_free_list;
    152 		al_free_list = p->next;
    153 		al_free_list_count--;
    154 	} else {
    155 		fl_miss_count++;
    156 		RF_Malloc(p, sizeof(RF_AllocListElem_t),
    157 			  (RF_AllocListElem_t *));
    158 		/* no allocation locking in kernel, so this is fine */
    159 	}
    160 	if (p == NULL) {
    161 		return (NULL);
    162 	}
    163 	memset((char *) p, 0, sizeof(RF_AllocListElem_t));
    164 	return (p);
    165 }
    166