523 lines
12 KiB
C
523 lines
12 KiB
C
/*
|
|
* Copyright (c) 1997,1999 by Internet Software Consortium.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
|
|
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
|
|
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
|
|
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
|
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
|
|
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
|
|
/* When this symbol is defined allocations via memget are made slightly
|
|
bigger and some debugging info stuck before and after the region given
|
|
back to the caller. */
|
|
/* #define DEBUGGING_MEMCLUSTER */
|
|
#define MEMCLUSTER_ATEND
|
|
|
|
|
|
#if !defined(LINT) && !defined(CODECENTER)
|
|
static const char rcsid[] = "$Id: memcluster.c,v 8.20 2001/02/13 23:14:54 marka Exp $";
|
|
#endif /* not lint */
|
|
|
|
#include "port_before.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <arpa/nameser.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include <isc/memcluster.h>
|
|
#include <isc/assertions.h>
|
|
|
|
#include "port_after.h"
|
|
|
|
#ifdef MEMCLUSTER_RECORD
|
|
#ifndef DEBUGGING_MEMCLUSTER
|
|
#define DEBUGGING_MEMCLUSTER
|
|
#endif
|
|
#endif
|
|
|
|
#define DEF_MAX_SIZE 1100
|
|
#define DEF_MEM_TARGET 4096
|
|
|
|
typedef u_int32_t fence_t;
|
|
|
|
typedef struct {
|
|
void * next;
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
#if defined(MEMCLUSTER_RECORD)
|
|
const char * file;
|
|
int line;
|
|
#endif
|
|
int size;
|
|
fence_t fencepost;
|
|
#endif
|
|
} memcluster_element;
|
|
|
|
#define SMALL_SIZE_LIMIT sizeof(memcluster_element)
|
|
#define P_SIZE sizeof(void *)
|
|
#define FRONT_FENCEPOST 0xfebafeba
|
|
#define BACK_FENCEPOST 0xabefabef
|
|
#define FENCEPOST_SIZE 4
|
|
|
|
#ifndef MEMCLUSTER_LITTLE_MALLOC
|
|
#define MEMCLUSTER_BIG_MALLOC 1
|
|
#define NUM_BASIC_BLOCKS 64
|
|
#endif
|
|
|
|
struct stats {
|
|
u_long gets;
|
|
u_long totalgets;
|
|
u_long blocks;
|
|
u_long freefrags;
|
|
};
|
|
|
|
/* Private data. */
|
|
|
|
static size_t max_size;
|
|
static size_t mem_target;
|
|
static size_t mem_target_half;
|
|
static size_t mem_target_fudge;
|
|
static memcluster_element ** freelists;
|
|
#ifdef MEMCLUSTER_RECORD
|
|
static memcluster_element ** activelists;
|
|
#endif
|
|
#ifdef MEMCLUSTER_BIG_MALLOC
|
|
static memcluster_element * basic_blocks;
|
|
#endif
|
|
static struct stats * stats;
|
|
|
|
/* Forward. */
|
|
|
|
static size_t quantize(size_t);
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
static void check(unsigned char *, int, size_t);
|
|
#endif
|
|
|
|
/* Public. */
|
|
|
|
int
|
|
meminit(size_t init_max_size, size_t target_size) {
|
|
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
INSIST(sizeof(fence_t) == FENCEPOST_SIZE);
|
|
#endif
|
|
if (freelists != NULL) {
|
|
errno = EEXIST;
|
|
return (-1);
|
|
}
|
|
if (init_max_size == 0)
|
|
max_size = DEF_MAX_SIZE;
|
|
else
|
|
max_size = init_max_size;
|
|
if (target_size == 0)
|
|
mem_target = DEF_MEM_TARGET;
|
|
else
|
|
mem_target = target_size;
|
|
mem_target_half = mem_target / 2;
|
|
mem_target_fudge = mem_target + mem_target / 4;
|
|
freelists = malloc(max_size * sizeof (memcluster_element *));
|
|
stats = malloc((max_size+1) * sizeof (struct stats));
|
|
if (freelists == NULL || stats == NULL) {
|
|
errno = ENOMEM;
|
|
return (-1);
|
|
}
|
|
memset(freelists, 0,
|
|
max_size * sizeof (memcluster_element *));
|
|
memset(stats, 0, (max_size + 1) * sizeof (struct stats));
|
|
#ifdef MEMCLUSTER_RECORD
|
|
activelists = malloc((max_size + 1) * sizeof (memcluster_element *));
|
|
if (activelists == NULL) {
|
|
errno = ENOMEM;
|
|
return (-1);
|
|
}
|
|
memset(activelists, 0,
|
|
(max_size + 1) * sizeof (memcluster_element *));
|
|
#endif
|
|
#ifdef MEMCLUSTER_BIG_MALLOC
|
|
basic_blocks = NULL;
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
void *
|
|
__memget(size_t size) {
|
|
return (__memget_record(size, NULL, 0));
|
|
}
|
|
|
|
void *
|
|
__memget_record(size_t size, const char *file, int line) {
|
|
size_t new_size = quantize(size);
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
memcluster_element *e;
|
|
char *p;
|
|
fence_t fp = BACK_FENCEPOST;
|
|
#endif
|
|
void *ret;
|
|
|
|
if (freelists == NULL)
|
|
if (meminit(0, 0) == -1)
|
|
return (NULL);
|
|
if (size == 0) {
|
|
errno = EINVAL;
|
|
return (NULL);
|
|
}
|
|
if (size >= max_size || new_size >= max_size) {
|
|
/* memget() was called on something beyond our upper limit. */
|
|
stats[max_size].gets++;
|
|
stats[max_size].totalgets++;
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
e = malloc(new_size);
|
|
if (e == NULL) {
|
|
errno = ENOMEM;
|
|
return (NULL);
|
|
}
|
|
e->next = NULL;
|
|
e->size = size;
|
|
#ifdef MEMCLUSTER_RECORD
|
|
e->file = file;
|
|
e->line = line;
|
|
e->next = activelists[max_size];
|
|
activelists[max_size] = e;
|
|
#endif
|
|
e->fencepost = FRONT_FENCEPOST;
|
|
p = (char *)e + sizeof *e + size;
|
|
memcpy(p, &fp, sizeof fp);
|
|
return ((char *)e + sizeof *e);
|
|
#else
|
|
return (malloc(size));
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* If there are no blocks in the free list for this size, get a chunk
|
|
* of memory and then break it up into "new_size"-sized blocks, adding
|
|
* them to the free list.
|
|
*/
|
|
if (freelists[new_size] == NULL) {
|
|
int i, frags;
|
|
size_t total_size;
|
|
void *new;
|
|
char *curr, *next;
|
|
|
|
#ifdef MEMCLUSTER_BIG_MALLOC
|
|
if (basic_blocks == NULL) {
|
|
new = malloc(NUM_BASIC_BLOCKS * mem_target);
|
|
if (new == NULL) {
|
|
errno = ENOMEM;
|
|
return (NULL);
|
|
}
|
|
curr = new;
|
|
next = curr + mem_target;
|
|
for (i = 0; i < (NUM_BASIC_BLOCKS - 1); i++) {
|
|
((memcluster_element *)curr)->next = next;
|
|
curr = next;
|
|
next += mem_target;
|
|
}
|
|
/*
|
|
* curr is now pointing at the last block in the
|
|
* array.
|
|
*/
|
|
((memcluster_element *)curr)->next = NULL;
|
|
basic_blocks = new;
|
|
}
|
|
total_size = mem_target;
|
|
new = basic_blocks;
|
|
basic_blocks = basic_blocks->next;
|
|
#else
|
|
if (new_size > mem_target_half)
|
|
total_size = mem_target_fudge;
|
|
else
|
|
total_size = mem_target;
|
|
new = malloc(total_size);
|
|
if (new == NULL) {
|
|
errno = ENOMEM;
|
|
return (NULL);
|
|
}
|
|
#endif
|
|
frags = total_size / new_size;
|
|
stats[new_size].blocks++;
|
|
stats[new_size].freefrags += frags;
|
|
/* Set up a linked-list of blocks of size "new_size". */
|
|
curr = new;
|
|
next = curr + new_size;
|
|
for (i = 0; i < (frags - 1); i++) {
|
|
#if defined (DEBUGGING_MEMCLUSTER)
|
|
memset(curr, 0xa5, new_size);
|
|
#endif
|
|
((memcluster_element *)curr)->next = next;
|
|
curr = next;
|
|
next += new_size;
|
|
}
|
|
/* curr is now pointing at the last block in the array. */
|
|
#if defined (DEBUGGING_MEMCLUSTER)
|
|
memset(curr, 0xa5, new_size);
|
|
#endif
|
|
((memcluster_element *)curr)->next = freelists[new_size];
|
|
freelists[new_size] = new;
|
|
}
|
|
|
|
/* The free list uses the "rounded-up" size "new_size". */
|
|
#if defined (DEBUGGING_MEMCLUSTER)
|
|
e = freelists[new_size];
|
|
ret = (char *)e + sizeof *e;
|
|
/*
|
|
* Check to see if this buffer has been written to while on free list.
|
|
*/
|
|
check(ret, 0xa5, new_size - sizeof *e);
|
|
/*
|
|
* Mark memory we are returning.
|
|
*/
|
|
memset(ret, 0xe5, size);
|
|
#else
|
|
ret = freelists[new_size];
|
|
#endif
|
|
freelists[new_size] = freelists[new_size]->next;
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
e->next = NULL;
|
|
e->size = size;
|
|
e->fencepost = FRONT_FENCEPOST;
|
|
#ifdef MEMCLUSTER_RECORD
|
|
e->file = file;
|
|
e->line = line;
|
|
e->next = activelists[size];
|
|
activelists[size] = e;
|
|
#endif
|
|
p = (char *)e + sizeof *e + size;
|
|
memcpy(p, &fp, sizeof fp);
|
|
#endif
|
|
|
|
/*
|
|
* The stats[] uses the _actual_ "size" requested by the
|
|
* caller, with the caveat (in the code above) that "size" >= the
|
|
* max. size (max_size) ends up getting recorded as a call to
|
|
* max_size.
|
|
*/
|
|
stats[size].gets++;
|
|
stats[size].totalgets++;
|
|
stats[new_size].freefrags--;
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
return ((char *)e + sizeof *e);
|
|
#else
|
|
return (ret);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* This is a call from an external caller,
|
|
* so we want to count this as a user "put".
|
|
*/
|
|
void
|
|
__memput(void *mem, size_t size) {
|
|
__memput_record(mem, size, NULL, 0);
|
|
}
|
|
|
|
void
|
|
__memput_record(void *mem, size_t size, const char *file, int line) {
|
|
size_t new_size = quantize(size);
|
|
#if defined (DEBUGGING_MEMCLUSTER)
|
|
memcluster_element *e;
|
|
#ifdef MEMCLUSTER_RECORD
|
|
memcluster_element *prev, *el;
|
|
#endif
|
|
int fp;
|
|
char *p;
|
|
#endif
|
|
REQUIRE(freelists != NULL);
|
|
|
|
if (size == 0) {
|
|
errno = EINVAL;
|
|
return;
|
|
}
|
|
|
|
#if defined (DEBUGGING_MEMCLUSTER)
|
|
e = (memcluster_element *) ((char *)mem - sizeof *e);
|
|
INSIST(e->fencepost == FRONT_FENCEPOST);
|
|
INSIST(e->size == size);
|
|
p = (char *)e + sizeof *e + size;
|
|
memcpy(&fp, p, sizeof fp);
|
|
INSIST(fp == BACK_FENCEPOST);
|
|
INSIST(((int)mem % 4) == 0);
|
|
#ifdef MEMCLUSTER_RECORD
|
|
prev = NULL;
|
|
if (size == max_size || new_size >= max_size)
|
|
el = activelists[max_size];
|
|
else
|
|
el = activelists[size];
|
|
while (el != NULL && el != e) {
|
|
prev = el;
|
|
el = el->next;
|
|
}
|
|
INSIST(el != NULL); /* double free */
|
|
if (prev == NULL) {
|
|
if (size == max_size || new_size >= max_size)
|
|
activelists[max_size] = el->next;
|
|
else
|
|
activelists[size] = el->next;
|
|
} else
|
|
prev->next = el->next;
|
|
#endif
|
|
#endif
|
|
|
|
if (size == max_size || new_size >= max_size) {
|
|
/* memput() called on something beyond our upper limit */
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
free(e);
|
|
#else
|
|
free(mem);
|
|
#endif
|
|
|
|
INSIST(stats[max_size].gets != 0);
|
|
stats[max_size].gets--;
|
|
return;
|
|
}
|
|
|
|
/* The free list uses the "rounded-up" size "new_size": */
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
memset(mem, 0xa5, new_size - sizeof *e); /* catch write after free */
|
|
e->size = 0; /* catch double memput() */
|
|
#ifdef MEMCLUSTER_RECORD
|
|
e->file = file;
|
|
e->line = line;
|
|
#endif
|
|
#ifdef MEMCLUSTER_ATEND
|
|
e->next = NULL;
|
|
el = freelists[new_size];
|
|
while (el != NULL && el->next != NULL)
|
|
el = el->next;
|
|
if (el)
|
|
el->next = e;
|
|
else
|
|
freelists[new_size] = e;
|
|
#else
|
|
e->next = freelists[new_size];
|
|
freelists[new_size] = (void *)e;
|
|
#endif
|
|
#else
|
|
((memcluster_element *)mem)->next = freelists[new_size];
|
|
freelists[new_size] = (memcluster_element *)mem;
|
|
#endif
|
|
|
|
/*
|
|
* The stats[] uses the _actual_ "size" requested by the
|
|
* caller, with the caveat (in the code above) that "size" >= the
|
|
* max. size (max_size) ends up getting recorded as a call to
|
|
* max_size.
|
|
*/
|
|
INSIST(stats[size].gets != 0);
|
|
stats[size].gets--;
|
|
stats[new_size].freefrags++;
|
|
}
|
|
|
|
void *
|
|
__memget_debug(size_t size, const char *file, int line) {
|
|
void *ptr;
|
|
ptr = __memget_record(size, file, line);
|
|
fprintf(stderr, "%s:%d: memget(%lu) -> %p\n", file, line,
|
|
(u_long)size, ptr);
|
|
return (ptr);
|
|
}
|
|
|
|
void
|
|
__memput_debug(void *ptr, size_t size, const char *file, int line) {
|
|
fprintf(stderr, "%s:%d: memput(%p, %lu)\n", file, line, ptr,
|
|
(u_long)size);
|
|
__memput_record(ptr, size, file, line);
|
|
}
|
|
|
|
/*
|
|
* Print the stats[] on the stream "out" with suitable formatting.
|
|
*/
|
|
void
|
|
memstats(FILE *out) {
|
|
size_t i;
|
|
#ifdef MEMCLUSTER_RECORD
|
|
memcluster_element *e;
|
|
#endif
|
|
|
|
if (freelists == NULL)
|
|
return;
|
|
for (i = 1; i <= max_size; i++) {
|
|
const struct stats *s = &stats[i];
|
|
|
|
if (s->totalgets == 0 && s->gets == 0)
|
|
continue;
|
|
fprintf(out, "%s%5d: %11lu gets, %11lu rem",
|
|
(i == max_size) ? ">=" : " ",
|
|
i, s->totalgets, s->gets);
|
|
if (s->blocks != 0)
|
|
fprintf(out, " (%lu bl, %lu ff)",
|
|
s->blocks, s->freefrags);
|
|
fputc('\n', out);
|
|
}
|
|
#ifdef MEMCLUSTER_RECORD
|
|
fprintf(out, "Active Memory:\n");
|
|
for (i = 1; i <= max_size; i++) {
|
|
if ((e = activelists[i]) != NULL)
|
|
while (e != NULL) {
|
|
fprintf(out, "%s:%d %#p:%d\n",
|
|
e->file != NULL ? e->file :
|
|
"<UNKNOWN>", e->line,
|
|
(char *)e + sizeof *e, e->size);
|
|
e = e->next;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Private. */
|
|
|
|
/*
|
|
* Round up size to a multiple of sizeof(void *). This guarantees that a
|
|
* block is at least sizeof void *, and that we won't violate alignment
|
|
* restrictions, both of which are needed to make lists of blocks.
|
|
*/
|
|
static size_t
|
|
quantize(size_t size) {
|
|
int remainder;
|
|
/*
|
|
* If there is no remainder for the integer division of
|
|
*
|
|
* (rightsize/P_SIZE)
|
|
*
|
|
* then we already have a good size; if not, then we need
|
|
* to round up the result in order to get a size big
|
|
* enough to satisfy the request _and_ aligned on P_SIZE boundaries.
|
|
*/
|
|
remainder = size % P_SIZE;
|
|
if (remainder != 0)
|
|
size += P_SIZE - remainder;
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
return (size + SMALL_SIZE_LIMIT + sizeof (int));
|
|
#else
|
|
return (size);
|
|
#endif
|
|
}
|
|
|
|
#if defined(DEBUGGING_MEMCLUSTER)
|
|
static void
|
|
check(unsigned char *a, int value, size_t len) {
|
|
int i;
|
|
for (i = 0; i < len; i++)
|
|
INSIST(a[i] == value);
|
|
}
|
|
#endif
|