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mars/kernel/brick_mem.c

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/*
* MARS Long Distance Replication Software
*
* This file is part of MARS project: http://schoebel.github.io/mars/
*
* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
* Copyright (C) 2011-2014 1&1 Internet AG
*
* 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 of the License, 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <asm/atomic.h>
#include "brick_mem.h"
#include "brick_say.h"
#include "brick_locks.h"
#include "lamport.h"
#include "buildtag.h"
#define USE_KERNEL_PAGES // currently mandatory (vmalloc does not work)
#define MAGIC_BLOCK (int)0x8B395D7B
#define MAGIC_BEND (int)0x8B395D7C
#define MAGIC_MEM1 (int)0x8B395D7D
#define MAGIC_MEM2 (int)0x9B395D8D
#define MAGIC_MEND1 (int)0x8B395D7E
#define MAGIC_MEND2 (int)0x9B395D8E
#define MAGIC_STR (int)0x8B395D7F
#define MAGIC_SEND (int)0x9B395D8F
#define INT_ACCESS(ptr,offset) (*(int*)(((char*)(ptr)) + (offset)))
/* This part is historic.
* To disappear in the long term.
* When CONFIG_MARS_DEBUG_DEVEL_VIA_SAY is unset, an empty .o
* should be created.
*/
#ifdef CONFIG_MARS_DEBUG_DEVEL_VIA_SAY
#define _BRICK_FMT(_fmt,_class) \
"%lld.%09ld %lld.%09ld MEM_%-5s %s[%d] %s:%d %s(): " \
_fmt, \
(s64)_s_now.tv_sec, _s_now.tv_nsec, \
(s64)_l_now.tv_sec, _l_now.tv_nsec, \
say_class[_class], \
current->comm, (int)smp_processor_id(), \
__BASE_FILE__, \
__LINE__, \
__FUNCTION__
#define _BRICK_MSG(_class, _dump, _fmt, _args...) \
do { \
struct lamport_time _s_now; \
struct lamport_time _l_now; \
\
get_lamport(&_s_now, &_l_now); \
say(_class, _BRICK_FMT(_fmt, _class), ##_args); \
if (_dump) dump_stack(); \
} while (0)
#define BRICK_COND_ERR(_cond, _fmt, _args...) \
_BRICK_MSG((_cond) ? SAY_ERROR : SAY_INFO, (_cond), _fmt, ##_args)
#define BRICK_ERR(_fmt, _args...) _BRICK_MSG(SAY_ERROR, true, _fmt, ##_args)
#define BRICK_WRN(_fmt, _args...) _BRICK_MSG(SAY_WARN, false, _fmt, ##_args)
#define BRICK_INF(_fmt, _args...) _BRICK_MSG(SAY_INFO, false, _fmt, ##_args)
#else /* CONFIG_MARS_DEBUG_DEVEL_VIA_SAY */
/* empty macros, as far as necessary */
#define _BRICK_FMT(_args...) /*empty*/
#define _BRICK_MSG(_args...) /*empty*/
#define BRICK_COND_ERR(_args...) /*empty*/
#define BRICK_ERR(_args...) /*empty*/
#define BRICK_WRN(_args...) /*empty*/
#define BRICK_INF(_args...) /*empty*/
#endif /* CONFIG_MARS_DEBUG_DEVEL_VIA_SAY */
/////////////////////////////////////////////////////////////////////////
// limit handling
#include <linux/swap.h>
long long brick_global_memavail = 0;
EXPORT_SYMBOL_GPL(brick_global_memavail);
long long brick_global_memlimit = 0;
EXPORT_SYMBOL_GPL(brick_global_memlimit);
atomic64_t brick_global_block_used = ATOMIC64_INIT(0);
EXPORT_SYMBOL_GPL(brick_global_block_used);
static
void get_total_ram(void)
{
struct sysinfo i = {};
si_meminfo(&i);
brick_global_memavail = (long long)i.totalram * (PAGE_SIZE / 1024);
BRICK_INF("total RAM = %lld [KiB]\n", brick_global_memavail);
}
/* Use the safe msleep_interruptible() from the upstream kernel.
* In addition to a linear backoff algorithms for dynamic
* CPU giveup, we allow negative arguments at the very first start
* of a polling-like cycle, more similar to cond_resched() behaviour.
*
* This is very useful in OOM-like situations, in order to allow
* other parts of the system to recover their operations.
* CAVEAT: the sleeps are rather long, so please use this only
* in desperate situations (when other measures have failed).
*/
void msleep_backoff(int *ms)
{
if (*ms < 0) {
*ms = 0;
return;
}
flush_signals(current);
msleep_interruptible(*ms);
/* Normally, we add only 1 jiffie per round, speculating
* that this will catch practically all usual cases in
* contemporary hardware stuff.
* Only when this speculation has proven wrong, we
* accelerate the linear slope somewhat.
*/
if (*ms < 100)
*ms += 1000 / HZ;
else if (*ms < 1000)
*ms += 10;
}
/////////////////////////////////////////////////////////////////////////
// small memory allocation (use this only for len < PAGE_SIZE)
#ifdef BRICK_DEBUG_MEM
static atomic_t phys_mem_alloc = ATOMIC_INIT(0);
static atomic_t mem_redirect_alloc = ATOMIC_INIT(0);
static atomic_t mem_count[BRICK_DEBUG_MEM] = {};
static atomic_t mem_free[BRICK_DEBUG_MEM] = {};
static int mem_len[BRICK_DEBUG_MEM] = {};
#define PLUS_SIZE (6 * sizeof(int))
#else
#define PLUS_SIZE (2 * sizeof(int))
#endif
static inline
void *__brick_mem_alloc(int len)
{
void *res;
if (len >= PAGE_SIZE) {
#ifdef BRICK_DEBUG_MEM
atomic_inc(&mem_redirect_alloc);
#endif
res = _brick_block_alloc(0, len, 0);
} else {
int ms = 0;
for (;;) {
res = kmalloc(len, GFP_BRICK);
if (likely(res))
break;
msleep_backoff(&ms);
}
#ifdef BRICK_DEBUG_MEM
atomic_inc(&phys_mem_alloc);
#endif
}
return res;
}
static inline
void __brick_mem_free(void *data, int len)
{
if (len >= PAGE_SIZE) {
_brick_block_free(data, len, 0);
#ifdef BRICK_DEBUG_MEM
atomic_dec(&mem_redirect_alloc);
#endif
} else {
kfree(data);
#ifdef BRICK_DEBUG_MEM
atomic_dec(&phys_mem_alloc);
#endif
}
}
void *_brick_mem_alloc(int len, int line)
{
void *res;
#ifdef CONFIG_MARS_DEBUG
might_sleep();
#endif
res = __brick_mem_alloc(len + PLUS_SIZE);
if (likely(res)) {
#ifdef BRICK_DEBUG_MEM
if (unlikely(line < 0))
line = 0;
else if (unlikely(line >= BRICK_DEBUG_MEM))
line = BRICK_DEBUG_MEM - 1;
INT_ACCESS(res, 0 * sizeof(int)) = MAGIC_MEM1;
INT_ACCESS(res, 1 * sizeof(int)) = len;
INT_ACCESS(res, 2 * sizeof(int)) = line;
INT_ACCESS(res, 3 * sizeof(int)) = MAGIC_MEM2;
res += 4 * sizeof(int);
INT_ACCESS(res, len + 0 * sizeof(int)) = MAGIC_MEND1;
INT_ACCESS(res, len + 1 * sizeof(int)) = MAGIC_MEND2;
atomic_inc(&mem_count[line]);
mem_len[line] = len;
#else
INT_ACCESS(res, 0 * sizeof(int)) = len;
res += PLUS_SIZE;
#endif
}
return res;
}
EXPORT_SYMBOL_GPL(_brick_mem_alloc);
void _brick_mem_free(void *data, int cline)
{
#ifdef BRICK_DEBUG_MEM
void *test = data - 4 * sizeof(int);
int magic1= INT_ACCESS(test, 0 * sizeof(int));
int len = INT_ACCESS(test, 1 * sizeof(int));
int line = INT_ACCESS(test, 2 * sizeof(int));
int magic2= INT_ACCESS(test, 3 * sizeof(int));
if (unlikely(magic1 != MAGIC_MEM1)) {
BRICK_ERR("line %d memory corruption: magix1 %08x != %08x, len = %d\n", cline, magic1, MAGIC_MEM1, len);
return;
}
if (unlikely(magic2 != MAGIC_MEM2)) {
BRICK_ERR("line %d memory corruption: magix2 %08x != %08x, len = %d\n", cline, magic2, MAGIC_MEM2, len);
return;
}
if (unlikely(line < 0 || line >= BRICK_DEBUG_MEM)) {
BRICK_ERR("line %d memory corruption: alloc line = %d, len = %d\n", cline, line, len);
return;
}
INT_ACCESS(test, 0) = 0xffffffff;
magic1 = INT_ACCESS(data, len + 0 * sizeof(int));
if (unlikely(magic1 != MAGIC_MEND1)) {
BRICK_ERR("line %d memory corruption: magix1 %08x != %08x, len = %d\n", cline, magic1, MAGIC_MEND1, len);
return;
}
magic2 = INT_ACCESS(data, len + 1 * sizeof(int));
if (unlikely(magic2 != MAGIC_MEND2)) {
BRICK_ERR("line %d memory corruption: magix2 %08x != %08x, len = %d\n", cline, magic2, MAGIC_MEND2, len);
return;
}
INT_ACCESS(data, len) = 0xffffffff;
atomic_dec(&mem_count[line]);
atomic_inc(&mem_free[line]);
#else
void *test = data - PLUS_SIZE;
int len = INT_ACCESS(test, 0 * sizeof(int));
#endif
data = test;
__brick_mem_free(data, len + PLUS_SIZE);
}
EXPORT_SYMBOL_GPL(_brick_mem_free);
/////////////////////////////////////////////////////////////////////////
// string memory allocation
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
# define STRING_CANARY \
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
"yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy" \
"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" \
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
"yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy" \
"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" \
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
"yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy" \
"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" \
" BUILDTAG = " BUILDTAG \
" BUILDHOST = " BUILDHOST \
" BUILDDATE = " BUILDDATE \
" FILE = " __FILE__ \
" VERSION = " __VERSION__ \
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx STRING_error xxx\n"
# define STRING_PLUS (sizeof(int) * 3 + sizeof(STRING_CANARY))
#elif defined(BRICK_DEBUG_MEM)
# define STRING_PLUS (sizeof(int) * 4)
#else
# define STRING_PLUS 0
#endif
#ifdef BRICK_DEBUG_MEM
static atomic_t phys_string_alloc = ATOMIC_INIT(0);
static atomic_t string_count[BRICK_DEBUG_MEM] = {};
static atomic_t string_free[BRICK_DEBUG_MEM] = {};
#endif
char *_brick_string_alloc(int len, int line)
{
int ms = 0;
char *res;
#ifdef CONFIG_MARS_DEBUG
might_sleep();
if (unlikely(len > PAGE_SIZE)) {
BRICK_WRN("line = %d string too long: len = %d\n", line, len);
}
#endif
if (len <= 0) {
len = BRICK_STRING_LEN;
}
for (;;) {
res = kzalloc(len + STRING_PLUS, GFP_BRICK);
if (likely(res))
break;
msleep_backoff(&ms);
}
#ifdef BRICK_DEBUG_MEM
if (likely(res)) {
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
memset(res + 1, '?', len - 1);
#endif
atomic_inc(&phys_string_alloc);
if (unlikely(line < 0))
line = 0;
else if (unlikely(line >= BRICK_DEBUG_MEM))
line = BRICK_DEBUG_MEM - 1;
INT_ACCESS(res, 0) = MAGIC_STR;
INT_ACCESS(res, sizeof(int)) = len;
INT_ACCESS(res, sizeof(int) * 2) = line;
res += sizeof(int) * 3;
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
strcpy(res + len, STRING_CANARY);
#else
INT_ACCESS(res, len) = MAGIC_SEND;
#endif
atomic_inc(&string_count[line]);
}
#endif
return res;
}
EXPORT_SYMBOL_GPL(_brick_string_alloc);
void _brick_string_free(const char *data, int cline)
{
#ifdef BRICK_DEBUG_MEM
int magic;
int len;
int line;
char *orig = (void*)data;
data -= sizeof(int) * 3;
magic = INT_ACCESS(data, 0);
if (unlikely(magic != MAGIC_STR)) {
BRICK_ERR("cline %d stringmem corruption: magix %08x != %08x\n", cline, magic, MAGIC_STR);
return;
}
len = INT_ACCESS(data, sizeof(int));
line = INT_ACCESS(data, sizeof(int) * 2);
if (unlikely(len <= 0)) {
BRICK_ERR("cline %d stringmem corruption: line = %d len = %d\n", cline, line, len);
return;
}
if (unlikely(len > PAGE_SIZE)) {
BRICK_ERR("cline %d string too long: line = %d len = %d string='%s'\n", cline, line, len, orig);
}
if (unlikely(line < 0 || line >= BRICK_DEBUG_MEM)) {
BRICK_ERR("cline %d stringmem corruption: line = %d (len = %d)\n", cline, line, len);
return;
}
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
if (unlikely(strcmp(orig + len, STRING_CANARY))) {
BRICK_ERR("cline %d stringmem corruption: bad canary '%s', line = %d len = %d\n",
cline, STRING_CANARY, line, len);
return;
}
orig[len]--;
memset(orig, '!', len);
#else
magic = INT_ACCESS(orig, len);
if (unlikely(magic != MAGIC_SEND)) {
BRICK_ERR("cline %d stringmem corruption: end_magix %08x != %08x, line = %d len = %d\n",
cline, magic, MAGIC_SEND, line, len);
return;
}
INT_ACCESS(orig, len) = 0xffffffff;
#endif
atomic_dec(&string_count[line]);
atomic_inc(&string_free[line]);
atomic_dec(&phys_string_alloc);
#endif
kfree(data);
}
EXPORT_SYMBOL_GPL(_brick_string_free);
/////////////////////////////////////////////////////////////////////////
// block memory allocation
static
int len2order(int len)
{
int order = 0;
if (unlikely(len <= 0)) {
BRICK_ERR("trying to use %d bytes\n", len);
return 0;
}
while ((PAGE_SIZE << order) < len)
order++;
if (unlikely(order > BRICK_MAX_ORDER)) {
BRICK_ERR("trying to use %d bytes (oder = %d, max = %d)\n", len, order, BRICK_MAX_ORDER);
return BRICK_MAX_ORDER;
}
return order;
}
#ifdef CONFIG_MARS_MEM_PREALLOC
static atomic_t _alloc_count[BRICK_MAX_ORDER+1] = {};
int brick_mem_alloc_count[BRICK_MAX_ORDER+1] = {};
EXPORT_SYMBOL_GPL(brick_mem_alloc_count);
int brick_mem_alloc_max[BRICK_MAX_ORDER+1] = {};
EXPORT_SYMBOL_GPL(brick_mem_alloc_max);
int brick_mem_freelist_max[BRICK_MAX_ORDER+1] = {};
EXPORT_SYMBOL_GPL(brick_mem_freelist_max);
#endif
#ifdef BRICK_DEBUG_MEM
static atomic_t phys_block_alloc = ATOMIC_INIT(0);
// indexed by line
static atomic_t block_count[BRICK_DEBUG_MEM] = {};
static atomic_t block_free[BRICK_DEBUG_MEM] = {};
static int block_len[BRICK_DEBUG_MEM] = {};
// indexed by order
static atomic_t op_count[BRICK_MAX_ORDER+1] = {};
static atomic_t raw_count[BRICK_MAX_ORDER+1] = {};
static int alloc_line[BRICK_MAX_ORDER+1] = {};
static int alloc_len[BRICK_MAX_ORDER+1] = {};
#endif
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
#define MAX_INFO_LISTS 1024
#define INFO_LIST_HASH(addr) ((unsigned long)(addr) / (PAGE_SIZE * 2) % MAX_INFO_LISTS)
struct mem_block_info {
struct list_head inf_head;
void *inf_data;
int inf_len;
int inf_line;
bool inf_used;
};
static struct list_head inf_anchor[MAX_INFO_LISTS];
static rwlock_t inf_lock[MAX_INFO_LISTS];
static
void _new_block_info(void *data, int len, int cline)
{
struct mem_block_info *inf;
int ms = 0;
unsigned int hash;
unsigned long flags;
for (;;) {
inf = kmalloc(sizeof(struct mem_block_info), GFP_BRICK);
if (likely(inf))
break;
msleep_backoff(&ms);
}
inf->inf_data = data;
inf->inf_len = len;
inf->inf_line = cline;
inf->inf_used = true;
hash = INFO_LIST_HASH(data);
write_lock_irqsave(&inf_lock[hash], flags);
list_add(&inf->inf_head, &inf_anchor[hash]);
write_unlock_irqrestore(&inf_lock[hash], flags);
}
static
struct mem_block_info *_find_block_info(void *data, bool remove)
{
struct mem_block_info *res = NULL;
struct list_head *tmp;
unsigned int hash = INFO_LIST_HASH(data);
unsigned long flags;
if (remove)
write_lock_irqsave(&inf_lock[hash], flags);
else
read_lock_irqsave(&inf_lock[hash], flags);
for (tmp = inf_anchor[hash].next; tmp != &inf_anchor[hash]; tmp = tmp->next) {
struct mem_block_info *inf = container_of(tmp, struct mem_block_info, inf_head);
if (inf->inf_data != data)
continue;
if (remove)
list_del_init(tmp);
res = inf;
break;
}
if (remove)
write_unlock_irqrestore(&inf_lock[hash], flags);
else
read_unlock_irqrestore(&inf_lock[hash], flags);
return res;
}
#endif // CONFIG_MARS_DEBUG_MEM_STRONG
static inline
void *__brick_block_alloc(gfp_t gfp, int order, int cline)
{
void *res;
int ms = 0;
for (;;) {
#ifdef USE_KERNEL_PAGES
res = (void*)__get_free_pages(gfp, order);
#else
res = __vmalloc(PAGE_SIZE << order, gfp, PAGE_KERNEL_IO);
#endif
if (likely(res))
break;
msleep_backoff(&ms);
}
if (likely(res)) {
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
_new_block_info(res, PAGE_SIZE << order, cline);
#endif
#ifdef BRICK_DEBUG_MEM
atomic_inc(&phys_block_alloc);
atomic_inc(&raw_count[order]);
#endif
atomic64_add((PAGE_SIZE/1024) << order, &brick_global_block_used);
}
return res;
}
static inline
void __brick_block_free(void *data, int order, int cline)
{
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
struct mem_block_info *inf = _find_block_info(data, true);
if (likely(inf)) {
int inf_len = inf->inf_len;
int inf_line;
inf_line = inf->inf_line;
kfree(inf);
if (unlikely(inf_len != (PAGE_SIZE << order))) {
BRICK_ERR("line %d: address %p: bad freeing size %d (correct should be %d, previous line = %d)\n", cline, data, (int)(PAGE_SIZE << order), inf_len, inf_line);
goto err;
}
} else {
BRICK_ERR("line %d: trying to free non-existent address %p (order = %d)\n", cline, data, order);
goto err;
}
#endif
#ifdef USE_KERNEL_PAGES
__free_pages(virt_to_page((unsigned long)data), order);
#else
vfree(data);
#endif
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
err:
#endif
#ifdef BRICK_DEBUG_MEM
atomic_dec(&phys_block_alloc);
atomic_dec(&raw_count[order]);
#endif
atomic64_sub((PAGE_SIZE/1024) << order, &brick_global_block_used);
}
#ifdef CONFIG_MARS_MEM_PREALLOC
int brick_allow_freelist = 1;
EXPORT_SYMBOL_GPL(brick_allow_freelist);
int brick_pre_reserve[BRICK_MAX_ORDER+1] = {};
EXPORT_SYMBOL_GPL(brick_pre_reserve);
/* Note: we have no separate lists per CPU.
* This should not hurt because the freelists are only used
* for higher-order pages which should be rather low-frequency.
*/
static spinlock_t freelist_lock[BRICK_MAX_ORDER+1];
static void *brick_freelist[BRICK_MAX_ORDER+1] = {};
static atomic_t freelist_count[BRICK_MAX_ORDER+1] = {};
static
void *_get_free(int order, int cline)
{
void *data;
unsigned long flags;
traced_lock(&freelist_lock[order], flags);
data = brick_freelist[order];
if (likely(data)) {
void *next = *(void**)data;
#ifdef BRICK_DEBUG_MEM // check for corruptions
long pattern = *(((long*)data)+1);
void *copy = *(((void**)data)+2);
if (unlikely(pattern != 0xf0f0f0f0f0f0f0f0 || next != copy)) { // found a corruption
// prevent further trouble by leaving a memleak
brick_freelist[order] = NULL;
traced_unlock(&freelist_lock[order], flags);
BRICK_ERR("line %d:freelist corruption at %p (pattern = %lx next %p != %p, murdered = %d), order = %d\n",
cline, data, pattern, next, copy, atomic_read(&freelist_count[order]), order);
return NULL;
}
#endif
brick_freelist[order] = next;
atomic_dec(&freelist_count[order]);
}
traced_unlock(&freelist_lock[order], flags);
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
if (data) {
struct mem_block_info *inf = _find_block_info(data, false);
if (likely(inf)) {
if (unlikely(inf->inf_len != (PAGE_SIZE << order))) {
BRICK_ERR("line %d: address %p: bad freelist size %d (correct should be %d, previous line = %d)\n",
cline, data, (int)(PAGE_SIZE << order), inf->inf_len, inf->inf_line);
}
inf->inf_line = cline;
inf->inf_used = true;
} else {
BRICK_ERR("line %d: freelist address %p is invalid (order = %d)\n", cline, data, order);
}
}
#endif
return data;
}
static
void _put_free(void *data, int order)
{
void *next;
unsigned long flags;
#ifdef BRICK_DEBUG_MEM // fill with pattern
memset(data, 0xf0, PAGE_SIZE << order);
#endif
traced_lock(&freelist_lock[order], flags);
next = brick_freelist[order];
*(void**)data = next;
#ifdef BRICK_DEBUG_MEM // insert redundant copy for checking
*(((void**)data)+2) = next;
#endif
brick_freelist[order] = data;
traced_unlock(&freelist_lock[order], flags);
atomic_inc(&freelist_count[order]);
}
static
void _free_all(void)
{
int order;
for (order = BRICK_MAX_ORDER; order >= 0; order--) {
for (;;) {
void *data = _get_free(order, __LINE__);
if (!data)
break;
cond_resched();
__brick_block_free(data, order, __LINE__);
}
}
}
int brick_mem_reserve(void)
{
int order;
int status = 0;
for (order = BRICK_MAX_ORDER; order >= 0; order--) {
int max = brick_pre_reserve[order];
int i;
brick_mem_freelist_max[order] += max;
BRICK_INF("preallocating %d at order %d (new maxlevel = %d)\n", max, order, brick_mem_freelist_max[order]);
max = brick_mem_freelist_max[order] - atomic_read(&freelist_count[order]);
if (max >= 0) {
for (i = 0; i < max; i++) {
void *data = __brick_block_alloc(GFP_KERNEL, order, __LINE__);
_put_free(data, order);
}
} else {
for (i = 0; i < -max; i++) {
void *data = _get_free(order, __LINE__);
if (likely(data)) {
__brick_block_free(data, order, __LINE__);
}
}
}
}
return status;
}
#else
int brick_mem_reserve(void)
{
BRICK_INF("preallocation is not compiled in\n");
return 0;
}
#endif
EXPORT_SYMBOL_GPL(brick_mem_reserve);
#ifdef CONFIG_MARS_MEM_MAX_RESERVE
void set_brick_mem_freelist_max(int max, int order)
{
if (max > brick_mem_freelist_max[order]) {
brick_mem_freelist_max[order] = max;
}
}
#else
void set_brick_mem_freelist_max(int max, int order)
{
}
#endif
void *_brick_block_alloc(loff_t pos, int len, int line)
{
void *data;
int count;
#ifdef BRICK_DEBUG_MEM
#ifdef BRICK_DEBUG_ORDER0
const int plus0 = PAGE_SIZE;
#else
const int plus0 = 0;
#endif
const int plus = len <= PAGE_SIZE ? plus0 : PAGE_SIZE * 2;
#else
const int plus = 0;
#endif
int order = len2order(len + plus);
if (unlikely(order < 0)) {
BRICK_ERR("trying to allocate %d bytes (max = %d)\n", len, (int)(PAGE_SIZE << order));
return NULL;
}
#ifdef CONFIG_MARS_DEBUG
might_sleep();
#endif
#ifdef CONFIG_MARS_MEM_PREALLOC
count = atomic_add_return(1, &_alloc_count[order]);
brick_mem_alloc_count[order] = count;
if (count > brick_mem_alloc_max[order])
brick_mem_alloc_max[order] = count;
#endif
#ifdef BRICK_DEBUG_MEM
atomic_inc(&op_count[order]);
// statistics
alloc_line[order] = line;
alloc_len[order] = len;
#endif
#ifdef CONFIG_MARS_MEM_PREALLOC
/* Dynamic increase of limits, in order to reduce
* fragmentation on higher-order pages.
* This comes on cost of higher memory usage.
*/
if (order > 0 && count > brick_mem_freelist_max[order])
brick_mem_freelist_max[order] = count;
#endif
#ifdef CONFIG_MARS_MEM_PREALLOC
data = _get_free(order, line);
if (!data)
#endif
data = __brick_block_alloc(GFP_BRICK, order, line);
#ifdef BRICK_DEBUG_MEM
if (likely(data) && order > 0) {
if (unlikely(line < 0))
line = 0;
else if (unlikely(line >= BRICK_DEBUG_MEM))
line = BRICK_DEBUG_MEM - 1;
atomic_inc(&block_count[line]);
block_len[line] = len;
if (order > 1) {
INT_ACCESS(data, 0 * sizeof(int)) = MAGIC_BLOCK;
INT_ACCESS(data, 1 * sizeof(int)) = line;
INT_ACCESS(data, 2 * sizeof(int)) = len;
data += PAGE_SIZE;
INT_ACCESS(data, -1 * sizeof(int)) = MAGIC_BLOCK;
INT_ACCESS(data, len) = MAGIC_BEND;
} else if (order == 1) {
INT_ACCESS(data, PAGE_SIZE + 0 * sizeof(int)) = MAGIC_BLOCK;
INT_ACCESS(data, PAGE_SIZE + 1 * sizeof(int)) = line;
INT_ACCESS(data, PAGE_SIZE + 2 * sizeof(int)) = len;
}
}
#endif
return data;
}
EXPORT_SYMBOL_GPL(_brick_block_alloc);
void _brick_block_free(void *data, int len, int cline)
{
int order;
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
struct mem_block_info *inf;
char *real_data;
#endif
#ifdef BRICK_DEBUG_MEM
int prev_line = 0;
#ifdef BRICK_DEBUG_ORDER0
const int plus0 = PAGE_SIZE;
#else
const int plus0 = 0;
#endif
const int plus = len <= PAGE_SIZE ? plus0 : PAGE_SIZE * 2;
#else
const int plus = 0;
#endif
order = len2order(len + plus);
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
real_data = data;
if (order > 1)
real_data -= PAGE_SIZE;
inf = _find_block_info(real_data, false);
if (likely(inf)) {
prev_line = inf->inf_line;
if (unlikely(inf->inf_len != (PAGE_SIZE << order))) {
BRICK_ERR("line %d: address %p: bad freeing size %d (correct should be %d, previous line = %d)\n",
cline, data, (int)(PAGE_SIZE << order), inf->inf_len, prev_line);
return;
}
if (unlikely(!inf->inf_used)) {
BRICK_ERR("line %d: address %p: double freeing (previous line = %d)\n", cline, data, prev_line);
return;
}
inf->inf_line = cline;
inf->inf_used = false;
} else {
BRICK_ERR("line %d: trying to free non-existent address %p (order = %d)\n", cline, data, order);
return;
}
#endif
#ifdef BRICK_DEBUG_MEM
(void)prev_line; /* silence annoying compiler warning */
if (order > 1) {
void *test = data - PAGE_SIZE;
int magic = INT_ACCESS(test, 0);
int line = INT_ACCESS(test, sizeof(int));
int oldlen = INT_ACCESS(test, sizeof(int)*2);
int magic1 = INT_ACCESS(data, -1 * sizeof(int));
int magic2;
if (unlikely(magic1 != MAGIC_BLOCK)) {
BRICK_ERR("line %d memory corruption: %p magix1 %08x != %08x (previous line = %d)\n", cline, data, magic1, MAGIC_BLOCK, prev_line);
return;
}
if (unlikely(magic != MAGIC_BLOCK)) {
BRICK_ERR("line %d memory corruption: %p magix %08x != %08x (previous line = %d)\n", cline, data, magic, MAGIC_BLOCK, prev_line);
return;
}
if (unlikely(line < 0 || line >= BRICK_DEBUG_MEM)) {
BRICK_ERR("line %d memory corruption %p: alloc line = %d (previous line = %d)\n", cline, data, line, prev_line);
return;
}
if (unlikely(oldlen != len)) {
BRICK_ERR("line %d memory corruption %p: len != oldlen (%d != %d, previous line = %d))\n", cline, data, len, oldlen, prev_line);
return;
}
magic2 = INT_ACCESS(data, len);
if (unlikely(magic2 != MAGIC_BEND)) {
BRICK_ERR("line %d memory corruption %p: magix %08x != %08x (previous line = %d)\n", cline, data, magic, MAGIC_BEND, prev_line);
return;
}
INT_ACCESS(test, 0) = 0xffffffff;
INT_ACCESS(data, len) = 0xffffffff;
data = test;
atomic_dec(&block_count[line]);
atomic_inc(&block_free[line]);
} else if (order == 1) {
void *test = data + PAGE_SIZE;
int magic = INT_ACCESS(test, 0 * sizeof(int));
int line = INT_ACCESS(test, 1 * sizeof(int));
int oldlen = INT_ACCESS(test, 2 * sizeof(int));
if (unlikely(magic != MAGIC_BLOCK)) {
BRICK_ERR("line %d memory corruption %p: magix %08x != %08x (previous line = %d)\n", cline, data, magic, MAGIC_BLOCK, prev_line);
return;
}
if (unlikely(line < 0 || line >= BRICK_DEBUG_MEM)) {
BRICK_ERR("line %d memory corruption %p: alloc line = %d (previous line = %d)\n", cline, data, line, prev_line);
return;
}
if (unlikely(oldlen != len)) {
BRICK_ERR("line %d memory corruption %p: len != oldlen (%d != %d, previous line = %d))\n", cline, data, len, oldlen, prev_line);
return;
}
atomic_dec(&block_count[line]);
atomic_inc(&block_free[line]);
}
#endif /* BRICK_DEBUG_MEM */
#ifdef CONFIG_MARS_MEM_PREALLOC
if (order > 0 && brick_allow_freelist && atomic_read(&freelist_count[order]) <= brick_mem_freelist_max[order]) {
_put_free(data, order);
} else
#endif
__brick_block_free(data, order, cline);
#ifdef CONFIG_MARS_MEM_PREALLOC
brick_mem_alloc_count[order] = atomic_dec_return(&_alloc_count[order]);
#endif
}
EXPORT_SYMBOL_GPL(_brick_block_free);
struct page *brick_iomap(void *data, int *offset, int *len)
{
int _offset = ((unsigned long)data) & (PAGE_SIZE-1);
struct page *page;
*offset = _offset;
if (*len > PAGE_SIZE - _offset) {
*len = PAGE_SIZE - _offset;
}
if (is_vmalloc_addr(data)) {
page = vmalloc_to_page(data);
} else {
page = virt_to_page(data);
}
return page;
}
EXPORT_SYMBOL_GPL(brick_iomap);
/////////////////////////////////////////////////////////////////////////
// module
#ifdef CONFIG_MARS_DEBUG_DEVEL_VIA_SAY
void brick_mem_statistics(bool final)
{
#ifdef BRICK_DEBUG_MEM
int i;
int count = 0;
int places = 0;
BRICK_INF("======== page allocation:\n");
#ifdef CONFIG_MARS_MEM_PREALLOC
for (i = 0; i <= BRICK_MAX_ORDER; i++) {
BRICK_INF("pages order = %2d "
"operations = %9d "
"freelist_count = %4d / %3d "
"raw_count = %5d "
"alloc_count = %5d "
"alloc_len = %5d "
"line = %5d "
"max_count = %5d\n",
i,
atomic_read(&op_count[i]),
atomic_read(&freelist_count[i]),
brick_mem_freelist_max[i],
atomic_read(&raw_count[i]),
brick_mem_alloc_count[i],
alloc_len[i],
alloc_line[i],
brick_mem_alloc_max[i]);
}
#endif
for (i = 0; i < BRICK_DEBUG_MEM; i++) {
int val = atomic_read(&block_count[i]);
if (val) {
count += val;
places++;
BRICK_INF("line %4d: "
"%6d allocated "
"(last size = %4d, freed = %6d)\n",
i,
val,
block_len[i],
atomic_read(&block_free[i]));
}
}
BRICK_COND_ERR(final && count,
"======== %d block allocations in %d places (phys=%d)\n",
count, places, atomic_read(&phys_block_alloc));
count = places = 0;
for (i = 0; i < BRICK_DEBUG_MEM; i++) {
int val = atomic_read(&mem_count[i]);
if (val) {
count += val;
places++;
BRICK_INF("line %4d: "
"%6d allocated "
"(last size = %4d, freed = %6d)\n",
i,
val,
mem_len[i],
atomic_read(&mem_free[i]));
}
}
BRICK_COND_ERR(final && count,
"======== %d memory allocations in %d places (phys=%d,redirect=%d)\n",
count, places,
atomic_read(&phys_mem_alloc), atomic_read(&mem_redirect_alloc));
count = places = 0;
for (i = 0; i < BRICK_DEBUG_MEM; i++) {
int val = atomic_read(&string_count[i]);
if (val) {
count += val;
places++;
BRICK_INF("line %4d: "
"%6d allocated "
"(freed = %6d)\n",
i,
val,
atomic_read(&string_free[i]));
}
}
BRICK_COND_ERR(final && count,
"======== %d string allocations in %d places (phys=%d)\n",
count, places, atomic_read(&phys_string_alloc));
#endif
}
EXPORT_SYMBOL_GPL(brick_mem_statistics);
#endif /* CONFIG_MARS_DEBUG_DEVEL_VIA_SAY */
// module init stuff
int __init init_brick_mem(void)
{
int i;
#ifdef CONFIG_MARS_MEM_PREALLOC
for (i = BRICK_MAX_ORDER; i >= 0; i--) {
spin_lock_init(&freelist_lock[i]);
}
#endif
#ifdef CONFIG_MARS_DEBUG_MEM_STRONG
for (i = 0; i < MAX_INFO_LISTS; i++) {
INIT_LIST_HEAD(&inf_anchor[i]);
rwlock_init(&inf_lock[i]);
}
#else
(void)i;
#endif
get_total_ram();
return 0;
}
void exit_brick_mem(void)
{
BRICK_INF("deallocating memory...\n");
#ifdef CONFIG_MARS_MEM_PREALLOC
_free_all();
#endif
#ifdef CONFIG_MARS_DEBUG_DEVEL_VIA_SAY
brick_mem_statistics(true);
#endif /* CONFIG_MARS_DEBUG_DEVEL_VIA_SAY */
}
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