/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2002-2013. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include <stddef.h>
#include "erl_smp.h"
#include "erl_mmap.h"
#if defined(DEBUG) || 0
# undef ERTS_MMAP_DEBUG
# define ERTS_MMAP_DEBUG
#endif
/* #define ERTS_MMAP_DEBUG_FILL_AREAS */
#ifdef ERTS_MMAP_DEBUG
# define ERTS_MMAP_ASSERT(A) \
((void) (!(A) \
? erts_mmap_assert_failed(#A, __func__, __FILE__, __LINE__)\
: 1))
static int
erts_mmap_assert_failed(const char *a, const char *func, const char *file, int line)
{
erts_fprintf(stderr, "%s:%d:%s() Assertion failed: %s\n",
(char *) file, line, (char *) func, (char *) a);
abort();
return 0;
}
#else
# define ERTS_MMAP_ASSERT(A) ((void) 1)
#endif
/*
* `mmap_state.sa.bot` and `mmap_state.sua.top` are read only after
* initialization, but the other pointers are not; i.e., only
* ERTS_MMAP_IN_SUPERCARRIER() is allowed without the mutex held.
*/
#define ERTS_MMAP_IN_SUPERCARRIER(PTR) \
(((UWord) (PTR)) - ((UWord) mmap_state.sa.bot) \
< ((UWord) mmap_state.sua.top) - ((UWord) mmap_state.sa.bot))
#define ERTS_MMAP_IN_SUPERALIGNED_AREA(PTR) \
(ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&mmap_state.mtx)), \
(((UWord) (PTR)) - ((UWord) mmap_state.sa.bot) \
< ((UWord) mmap_state.sa.top) - ((UWord) mmap_state.sa.bot)))
#define ERTS_MMAP_IN_SUPERUNALIGNED_AREA(PTR) \
(ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&mmap_state.mtx)), \
(((UWord) (PTR)) - ((UWord) mmap_state.sua.bot) \
< ((UWord) mmap_state.sua.top) - ((UWord) mmap_state.sua.bot)))
int erts_have_erts_mmap;
UWord erts_page_inv_mask;
#if defined(DEBUG) || defined(ERTS_MMAP_DEBUG)
# undef RBT_DEBUG
# define RBT_DEBUG
#endif
#ifdef RBT_DEBUG
# define RBT_ASSERT ERTS_ASSERT
# define IF_RBT_DEBUG(C) C
#else
# define RBT_ASSERT(x)
# define IF_RBT_DEBUG(C)
#endif
typedef struct RBTNode_ RBTNode;
struct RBTNode_ {
UWord parent_and_color; /* color in bit 0 of parent ptr */
RBTNode *left;
RBTNode *right;
};
#define RED_FLG (1)
#define IS_RED(N) ((N) && ((N)->parent_and_color & RED_FLG))
#define IS_BLACK(N) (!IS_RED(N))
#define SET_RED(N) ((N)->parent_and_color |= RED_FLG)
#define SET_BLACK(N) ((N)->parent_and_color &= ~RED_FLG)
static ERTS_INLINE RBTNode* parent(RBTNode* node)
{
return (RBTNode*) (node->parent_and_color & ~RED_FLG);
}
static ERTS_INLINE void set_parent(RBTNode* node, RBTNode* parent)
{
RBT_ASSERT(!((UWord)parent & RED_FLG));
node->parent_and_color = ((UWord)parent) | (node->parent_and_color & RED_FLG);
}
static ERTS_INLINE UWord parent_and_color(RBTNode* parent, int color)
{
RBT_ASSERT(!((UWord)parent & RED_FLG));
RBT_ASSERT(!(color & ~RED_FLG));
return ((UWord)parent) | color;
}
enum SortOrder {
ADDR_ORDER, /* only address order */
SZ_ADDR_ORDER, /* first size then address order as tiebreaker */
SZ_REVERSE_ADDR_ORDER /* first size then reverse address order */
};
typedef struct {
RBTNode* root;
enum SortOrder order;
}RBTree;
#ifdef HARD_DEBUG
# define HARD_CHECK_IS_MEMBER(ROOT,NODE) rbt_assert_is_member(ROOT,NODE)
# define HARD_CHECK_TREE(TREE,SZ) check_tree(TREE, SZ)
static int rbt_assert_is_member(RBTNode* root, RBTNode* node);
static RBTNode* check_tree(RBTree* tree, Uint);
#else
# define HARD_CHECK_IS_MEMBER(ROOT,NODE)
# define HARD_CHECK_TREE(TREE,SZ)
#endif
typedef struct {
RBTNode snode;
RBTNode anode;
char* start;
char* end;
}ErtsFreeSegDesc;
typedef struct {
RBTree stree;
RBTree atree;
}ErtsFreeSegMap;
static struct {
int (*reserve_physical)(char *, UWord);
void (*unreserve_physical)(char *, UWord);
int supercarrier;
int no_os_mmap;
/*
* Super unaligend area is located above super aligned
* area. That is, `sa.bot` is beginning of the super
* carrier, `sua.top` is the end of the super carrier,
* and sa.top and sua.bot moves towards eachother.
*/
struct {
char *top;
char *bot;
ErtsFreeSegMap map;
} sua;
struct {
char *top;
char *bot;
ErtsFreeSegMap map;
} sa;
#if HAVE_MMAP && (!defined(MAP_ANON) && !defined(MAP_ANONYMOUS))
int mmap_fd;
#endif
erts_smp_mtx_t mtx;
char *desc_free_list;
struct {
struct {
UWord total;
struct {
UWord total;
UWord sa;
UWord sua;
} used;
} supercarrier;
struct {
UWord used;
} os;
} size;
} mmap_state;
#define ERTS_MMAP_SIZE_SC_SA_INC(SZ) \
do { \
mmap_state.size.supercarrier.used.total += (SZ); \
mmap_state.size.supercarrier.used.sa += (SZ); \
ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.total \
<= mmap_state.size.supercarrier.total); \
ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.sa \
<= mmap_state.size.supercarrier.used.total); \
} while (0)
#define ERTS_MMAP_SIZE_SC_SA_DEC(SZ) \
do { \
ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.total >= (SZ)); \
mmap_state.size.supercarrier.used.total -= (SZ); \
ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.sa >= (SZ)); \
mmap_state.size.supercarrier.used.sa -= (SZ); \
} while (0)
#define ERTS_MMAP_SIZE_SC_SUA_INC(SZ) \
do { \
mmap_state.size.supercarrier.used.total += (SZ); \
mmap_state.size.supercarrier.used.sua += (SZ); \
ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.total \
<= mmap_state.size.supercarrier.total); \
ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.sua \
<= mmap_state.size.supercarrier.used.total); \
} while (0)
#define ERTS_MMAP_SIZE_SC_SUA_DEC(SZ) \
do { \
ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.total >= (SZ)); \
mmap_state.size.supercarrier.used.total -= (SZ); \
ERTS_MMAP_ASSERT(mmap_state.size.supercarrier.used.sua >= (SZ)); \
mmap_state.size.supercarrier.used.sua -= (SZ); \
} while (0)
#define ERTS_MMAP_SIZE_OS_INC(SZ) \
do { \
ERTS_MMAP_ASSERT(mmap_state.size.os.used + (SZ) >= (SZ)); \
mmap_state.size.os.used += (SZ); \
} while (0)
#define ERTS_MMAP_SIZE_OS_DEC(SZ) \
do { \
ERTS_MMAP_ASSERT(mmap_state.size.os.used >= (SZ)); \
mmap_state.size.os.used -= (SZ); \
} while (0)
static void
add_free_desc_area(char *start, char *end)
{
if (end > start && sizeof(ErtsFreeSegDesc) <= end - start) {
ErtsFreeSegDesc *prev_desc, *desc;
char *desc_end;
prev_desc = (ErtsFreeSegDesc *) start;
prev_desc->start = mmap_state.desc_free_list;
desc = (ErtsFreeSegDesc *) (start + sizeof(ErtsFreeSegDesc));
desc_end = start + 2*sizeof(ErtsFreeSegDesc);
while (desc_end <= end) {
desc->start = (char *) prev_desc;
prev_desc = desc;
desc = (ErtsFreeSegDesc *) desc_end;
desc_end += sizeof(ErtsFreeSegDesc);
}
mmap_state.desc_free_list = (char *) prev_desc;
}
}
static ERTS_INLINE ErtsFreeSegDesc *
alloc_desc(void)
{
ErtsFreeSegDesc *res;
res = (ErtsFreeSegDesc *) mmap_state.desc_free_list;
if (res)
mmap_state.desc_free_list = res->start;
return res;
}
static ERTS_INLINE void
free_desc(ErtsFreeSegDesc *desc)
{
desc->start = mmap_state.desc_free_list;
mmap_state.desc_free_list = (char *) desc;
}
static ERTS_INLINE ErtsFreeSegDesc* anode_to_desc(RBTNode* anode)
{
return (ErtsFreeSegDesc*) ((char*)anode - offsetof(ErtsFreeSegDesc, anode));
}
static ERTS_INLINE ErtsFreeSegDesc* snode_to_desc(RBTNode* snode)
{
return (ErtsFreeSegDesc*) ((char*)snode - offsetof(ErtsFreeSegDesc, snode));
}
static ERTS_INLINE ErtsFreeSegDesc* node_to_desc(enum SortOrder order, RBTNode* node)
{
return order==ADDR_ORDER ? anode_to_desc(node) : snode_to_desc(node);
}
#ifdef HARD_DEBUG
static ERTS_INLINE SWord cmp_blocks(enum SortOrder order,
RBTNode* lhs, RBTNode* rhs)
{
ErtsFreeSegDesc* ldesc = node_to_desc(order, lhs);
ErtsFreeSegDesc* rdesc = node_to_desc(order, rhs);
RBT_ASSERT(lhs != rhs);
if (order != ADDR_ORDER) {
SWord lsz = ldesc->end - ldesc->start;
SWord rsz = rdesc->end - rdesc->start;
SWord diff = lsz - rsz;
if (diff) return diff;
}
if (order != SZ_REVERSE_ADDR_ORDER) {
return (char*)ldesc->start - (char*)rdesc->start;
}
else {
return (char*)rdesc->start - (char*)ldesc->start;
}
}
#endif
static ERTS_INLINE SWord cmp_with_block(enum SortOrder order,
SWord sz, char* addr, RBTNode* rhs)
{
ErtsFreeSegDesc* rdesc;
if (order != ADDR_ORDER) {
rdesc = snode_to_desc(rhs);
{
SWord rhs_sz = rdesc->end - rdesc->start;
SWord diff = sz - rhs_sz;
if (diff) return diff;
}
}
else
rdesc = anode_to_desc(rhs);
if (order != SZ_REVERSE_ADDR_ORDER)
return addr - (char*)rdesc->start;
else
return (char*)rdesc->start - addr;
}
static ERTS_INLINE void
left_rotate(RBTNode **root, RBTNode *x)
{
RBTNode *y = x->right;
x->right = y->left;
if (y->left)
set_parent(y->left, x);
set_parent(y, parent(x));
if (!parent(y)) {
RBT_ASSERT(*root == x);
*root = y;
}
else if (x == parent(x)->left)
parent(x)->left = y;
else {
RBT_ASSERT(x == parent(x)->right);
parent(x)->right = y;
}
y->left = x;
set_parent(x, y);
/*SVERK y->max_sz = x->max_sz;
x->max_sz = node_max_size(x);
ASSERT(y->max_sz >= x->max_sz);*/
}
static ERTS_INLINE void
right_rotate(RBTNode **root, RBTNode *x)
{
RBTNode *y = x->left;
x->left = y->right;
if (y->right)
set_parent(y->right, x);
set_parent(y, parent(x));
if (!parent(y)) {
RBT_ASSERT(*root == x);
*root = y;
}
else if (x == parent(x)->right)
parent(x)->right = y;
else {
RBT_ASSERT(x == parent(x)->left);
parent(x)->left = y;
}
y->right = x;
set_parent(x, y);
/*SVERK y->max_sz = x->max_sz;
x->max_sz = node_max_size(x);
ASSERT(y->max_sz >= x->max_sz);*/
}
/*
* Replace node x with node y
* NOTE: block header of y is not changed
*/
static ERTS_INLINE void
replace(RBTNode **root, RBTNode *x, RBTNode *y)
{
if (!parent(x)) {
RBT_ASSERT(*root == x);
*root = y;
}
else if (x == parent(x)->left)
parent(x)->left = y;
else {
RBT_ASSERT(x == parent(x)->right);
parent(x)->right = y;
}
if (x->left) {
RBT_ASSERT(parent(x->left) == x);
set_parent(x->left, y);
}
if (x->right) {
RBT_ASSERT(parent(x->right) == x);
set_parent(x->right, y);
}
/*y->flags = x->flags;*/
y->parent_and_color = x->parent_and_color;
y->right = x->right;
y->left = x->left;
/*SVERK y->max_sz = x->max_sz;*/
}
static void
tree_insert_fixup(RBTNode** root, RBTNode *blk)
{
RBTNode *x = blk, *y;
/*
* Rearrange the tree so that it satisfies the Red-Black Tree properties
*/
RBT_ASSERT(x != *root && IS_RED(parent(x)));
do {
/*
* x and its parent are both red. Move the red pair up the tree
* until we get to the root or until we can separate them.
*/
RBT_ASSERT(IS_RED(x));
RBT_ASSERT(IS_BLACK(parent(parent(x))));
RBT_ASSERT(parent(parent(x)));
if (parent(x) == parent(parent(x))->left) {
y = parent(parent(x))->right;
if (IS_RED(y)) {
SET_BLACK(y);
x = parent(x);
SET_BLACK(x);
x = parent(x);
SET_RED(x);
}
else {
if (x == parent(x)->right) {
x = parent(x);
left_rotate(root, x);
}
RBT_ASSERT(x == parent(parent(x))->left->left);
RBT_ASSERT(IS_RED(x));
RBT_ASSERT(IS_RED(parent(x)));
RBT_ASSERT(IS_BLACK(parent(parent(x))));
RBT_ASSERT(IS_BLACK(y));
SET_BLACK(parent(x));
SET_RED(parent(parent(x)));
right_rotate(root, parent(parent(x)));
RBT_ASSERT(x == parent(x)->left);
RBT_ASSERT(IS_RED(x));
RBT_ASSERT(IS_RED(parent(x)->right));
RBT_ASSERT(IS_BLACK(parent(x)));
break;
}
}
else {
RBT_ASSERT(parent(x) == parent(parent(x))->right);
y = parent(parent(x))->left;
if (IS_RED(y)) {
SET_BLACK(y);
x = parent(x);
SET_BLACK(x);
x = parent(x);
SET_RED(x);
}
else {
if (x == parent(x)->left) {
x = parent(x);
right_rotate(root, x);
}
RBT_ASSERT(x == parent(parent(x))->right->right);
RBT_ASSERT(IS_RED(x));
RBT_ASSERT(IS_RED(parent(x)));
RBT_ASSERT(IS_BLACK(parent(parent(x))));
RBT_ASSERT(IS_BLACK(y));
SET_BLACK(parent(x));
SET_RED(parent(parent(x)));
left_rotate(root, parent(parent(x)));
RBT_ASSERT(x == parent(x)->right);
RBT_ASSERT(IS_RED(x));
RBT_ASSERT(IS_RED(parent(x)->left));
RBT_ASSERT(IS_BLACK(parent(x)));
break;
}
}
} while (x != *root && IS_RED(parent(x)));
SET_BLACK(*root);
}
static void
rbt_delete(RBTNode** root, RBTNode* del)
{
Uint spliced_is_black;
RBTNode *x, *y, *z = del;
RBTNode null_x; /* null_x is used to get the fixup started when we
splice out a node without children. */
HARD_CHECK_IS_MEMBER(*root, del);
null_x.parent_and_color = parent_and_color(NULL, !RED_FLG);
/* Remove node from tree... */
/* Find node to splice out */
if (!z->left || !z->right)
y = z;
else
/* Set y to z:s successor */
for(y = z->right; y->left; y = y->left);
/* splice out y */
x = y->left ? y->left : y->right;
spliced_is_black = IS_BLACK(y);
if (x) {
set_parent(x, parent(y));
}
else if (spliced_is_black) {
x = &null_x;
/*x->flags = 0;
SET_BLACK(x);*/
x->right = x->left = NULL;
/*SVERK x->max_sz = 0;*/
x->parent_and_color = parent_and_color(parent(y), !RED_FLG);
y->left = x;
}
if (!parent(y)) {
RBT_ASSERT(*root == y);
*root = x;
}
else {
if (y == parent(y)->left) {
parent(y)->left = x;
}
else {
RBT_ASSERT(y == parent(y)->right);
parent(y)->right = x;
}
/*SVERK if (y->parent != z) {
lower_max_size(y->parent, (y==z ? NULL : z));
}*/
}
if (y != z) {
/* We spliced out the successor of z; replace z by the successor */
RBT_ASSERT(z != &null_x);
replace(root, z, y);
/*SVERK lower_max_size(y, NULL);*/
}
if (spliced_is_black) {
/* We removed a black node which makes the resulting tree
violate the Red-Black Tree properties. Fixup tree... */
while (IS_BLACK(x) && parent(x)) {
/*
* x has an "extra black" which we move up the tree
* until we reach the root or until we can get rid of it.
*
* y is the sibbling of x
*/
if (x == parent(x)->left) {
y = parent(x)->right;
RBT_ASSERT(y);
if (IS_RED(y)) {
RBT_ASSERT(y->right);
RBT_ASSERT(y->left);
SET_BLACK(y);
RBT_ASSERT(IS_BLACK(parent(x)));
SET_RED(parent(x));
left_rotate(root, parent(x));
y = parent(x)->right;
}
RBT_ASSERT(y);
RBT_ASSERT(IS_BLACK(y));
if (IS_BLACK(y->left) && IS_BLACK(y->right)) {
SET_RED(y);
x = parent(x);
}
else {
if (IS_BLACK(y->right)) {
SET_BLACK(y->left);
SET_RED(y);
right_rotate(root, y);
y = parent(x)->right;
}
RBT_ASSERT(y);
if (IS_RED(parent(x))) {
SET_BLACK(parent(x));
SET_RED(y);
}
RBT_ASSERT(y->right);
SET_BLACK(y->right);
left_rotate(root, parent(x));
x = *root;
break;
}
}
else {
RBT_ASSERT(x == parent(x)->right);
y = parent(x)->left;
RBT_ASSERT(y);
if (IS_RED(y)) {
RBT_ASSERT(y->right);
RBT_ASSERT(y->left);
SET_BLACK(y);
RBT_ASSERT(IS_BLACK(parent(x)));
SET_RED(parent(x));
right_rotate(root, parent(x));
y = parent(x)->left;
}
RBT_ASSERT(y);
RBT_ASSERT(IS_BLACK(y));
if (IS_BLACK(y->right) && IS_BLACK(y->left)) {
SET_RED(y);
x = parent(x);
}
else {
if (IS_BLACK(y->left)) {
SET_BLACK(y->right);
SET_RED(y);
left_rotate(root, y);
y = parent(x)->left;
}
RBT_ASSERT(y);
if (IS_RED(parent(x))) {
SET_BLACK(parent(x));
SET_RED(y);
}
RBT_ASSERT(y->left);
SET_BLACK(y->left);
right_rotate(root, parent(x));
x = *root;
break;
}
}
}
SET_BLACK(x);
if (parent(&null_x)) {
if (parent(&null_x)->left == &null_x)
parent(&null_x)->left = NULL;
else {
RBT_ASSERT(parent(&null_x)->right == &null_x);
parent(&null_x)->right = NULL;
}
RBT_ASSERT(!null_x.left);
RBT_ASSERT(!null_x.right);
}
else if (*root == &null_x) {
*root = NULL;
RBT_ASSERT(!null_x.left);
RBT_ASSERT(!null_x.right);
}
}
}
static void
rbt_insert(enum SortOrder order, RBTNode** root, RBTNode* blk)
{
#ifdef RBT_DEBUG
ErtsFreeSegDesc *dbg_under=NULL, *dbg_over=NULL;
#endif
ErtsFreeSegDesc* desc = node_to_desc(order, blk);
char* blk_addr = desc->start;
SWord blk_sz = desc->end - desc->start;
/*SVERK Uint blk_sz = AOFF_BLK_SZ(blk);*/
/*blk->flags = 0;*/
blk->left = NULL;
blk->right = NULL;
/*SVERK blk->max_sz = blk_sz;*/
if (!*root) {
blk->parent_and_color = parent_and_color(NULL, !RED_FLG);
/*SET_BLACK(blk);*/
*root = blk;
}
else {
RBTNode *x = *root;
while (1) {
SWord diff;
/*SVERK if (x->max_sz < blk_sz) {
x->max_sz = blk_sz;
}*/
diff = cmp_with_block(order, blk_sz, blk_addr, x);
if (diff < 0) {
IF_RBT_DEBUG(dbg_over = node_to_desc(order, x));
if (!x->left) {
blk->parent_and_color = parent_and_color(x, RED_FLG);
x->left = blk;
break;
}
x = x->left;
}
else {
RBT_ASSERT(diff > 0);
IF_RBT_DEBUG(dbg_under = node_to_desc(order, x));
if (!x->right) {
blk->parent_and_color = parent_and_color(x, RED_FLG);
x->right = blk;
break;
}
x = x->right;
}
/*SVERK else {
ASSERT(flavor == AOFF_BF);
ASSERT(blk->flags & IS_BF_FLG);
ASSERT(x->flags & IS_BF_FLG);
SET_LIST_ELEM(blk);
LIST_NEXT(blk) = LIST_NEXT(x);
LIST_PREV(blk) = x;
if (LIST_NEXT(x))
LIST_PREV(LIST_NEXT(x)) = blk;
LIST_NEXT(x) = blk;
return;
}*/
}
/* Insert block into size tree */
RBT_ASSERT(parent(blk));
#ifdef RBT_DEBUG
if (!order) {
RBT_ASSERT(!dbg_under || dbg_under->end < desc->start);
RBT_ASSERT(!dbg_over || dbg_over->start > desc->end);
}
#endif
/*SET_RED(blk);*/
RBT_ASSERT(IS_RED(blk));
if (IS_RED(parent(blk)))
tree_insert_fixup(root, blk);
}
/*SVERK if (flavor == AOFF_BF) {
SET_TREE_NODE(blk);
LIST_NEXT(blk) = NULL;
}*/
}
/* The API to keep track of a bunch of separated free segments
(non-overlapping and non-adjacent).
*/
static void init_free_seg_map(ErtsFreeSegMap*, int reverse_ao);
static void adjacent_free_seg(ErtsFreeSegMap*, char* start, char* end,
ErtsFreeSegDesc** under, ErtsFreeSegDesc** over);
static void insert_free_seg(ErtsFreeSegMap*, ErtsFreeSegDesc*, char* start, char* end);
static void resize_free_seg(ErtsFreeSegMap*, ErtsFreeSegDesc*, char* start, char* end);
static void delete_free_seg(ErtsFreeSegMap*, ErtsFreeSegDesc*);
static ErtsFreeSegDesc* lookup_free_seg(ErtsFreeSegMap*, SWord sz);
static void init_free_seg_map(ErtsFreeSegMap* map, int reverse_ao)
{
map->atree.root = NULL;
map->atree.order = ADDR_ORDER;
map->stree.root = NULL;
map->stree.order = reverse_ao ? SZ_REVERSE_ADDR_ORDER : SZ_ADDR_ORDER;
}
static void adjacent_free_seg(ErtsFreeSegMap* map, char* start, char* end,
ErtsFreeSegDesc** under, ErtsFreeSegDesc** over)
{
RBTNode* x = map->atree.root;
*under = NULL;
*over = NULL;
while (x) {
if (start < anode_to_desc(x)->start) {
RBT_ASSERT(end <= anode_to_desc(x)->start);
if (end == anode_to_desc(x)->start) {
RBT_ASSERT(!*over);
*over = anode_to_desc(x);
}
x = x->left;
}
else {
RBT_ASSERT(start >= anode_to_desc(x)->end);
if (start == anode_to_desc(x)->end) {
RBT_ASSERT(!*under);
*under = anode_to_desc(x);
}
x = x->right;
}
}
}
static void insert_free_seg(ErtsFreeSegMap* map, ErtsFreeSegDesc* desc,
char* start, char* end)
{
desc->start = start;
desc->end = end;
rbt_insert(map->atree.order, &map->atree.root, &desc->anode);
rbt_insert(map->stree.order, &map->stree.root, &desc->snode);
}
static void resize_free_seg(ErtsFreeSegMap* map, ErtsFreeSegDesc* desc,
char* start, char* end)
{
#ifdef DEBUG
ErtsFreeSegDesc *dbg_under, *dbg_over;
rbt_delete(&map->atree.root, &desc->anode);
adjacent_free_seg(map, start, end, &dbg_under, &dbg_over);
RBT_ASSERT(dbg_under == NULL && dbg_over == NULL);
rbt_insert(map->atree.order, &map->atree.root, &desc->anode);
#endif
rbt_delete(&map->stree.root, &desc->snode);
desc->start = start;
desc->end = end;
rbt_insert(map->stree.order, &map->stree.root, &desc->snode);
}
static void delete_free_seg(ErtsFreeSegMap* map, ErtsFreeSegDesc* desc)
{
rbt_delete(&map->atree.root, &desc->anode);
rbt_delete(&map->stree.root, &desc->snode);
}
static ErtsFreeSegDesc* lookup_free_seg(ErtsFreeSegMap* map, SWord need_sz)
{
RBTNode* x = map->stree.root;
ErtsFreeSegDesc* best_desc = NULL;
while (x) {
ErtsFreeSegDesc* desc = snode_to_desc(x);
SWord seg_sz = desc->end - desc->start;
if (seg_sz < need_sz) {
x = x->right;
}
else {
best_desc = desc;
x = x->left;
}
}
return best_desc;
}
#if ERTS_HAVE_OS_MMAP
/* Implementation of os_mmap()/os_munmap()/os_mremap()... */
#if HAVE_MMAP
# define ERTS_MMAP_PROT (PROT_READ|PROT_WRITE)
# if defined(MAP_ANONYMOUS)
# define ERTS_MMAP_FLAGS (MAP_ANON|MAP_PRIVATE)
# define ERTS_MMAP_FD (-1)
# elif defined(MAP_ANON)
# define ERTS_MMAP_FLAGS (MAP_ANON|MAP_PRIVATE)
# define ERTS_MMAP_FD (-1)
# else
# define ERTS_MMAP_FLAGS (MAP_PRIVATE)
# define ERTS_MMAP_FD mmap_state.mmap_fd
# endif
#endif
static ERTS_INLINE void *
os_mmap(UWord size, int try_superalign)
{
#if HAVE_MMAP
void *res;
#ifdef MAP_ALIGN
if (try_superalign)
res = mmap((void *) ERTS_SUPERALIGNED_SIZE, size, ERTS_MMAP_PROT,
ERTS_MMAP_FLAGS|MAP_ALIGN, ERTS_MMAP_FD, 0);
else
#endif
res = mmap((void *) 0, size, ERTS_MMAP_PROT,
ERTS_MMAP_FLAGS, ERTS_MMAP_FD, 0);
if (res == MAP_FAILED)
return NULL;
return res;
#elif HAVE_VIRTUALALLOC
return (void *) VirtualAlloc(NULL, (SIZE_T) size,
MEM_COMMIT|MEM_RESERVE, PAGE_READWRITE);
#else
# error "missing mmap() or similar"
#endif
}
static ERTS_INLINE void
os_munmap(void *ptr, UWord size)
{
#if HAVE_MMAP
#ifdef ERTS_MMAP_DEBUG
int res =
#endif
munmap(ptr, size);
ERTS_MMAP_ASSERT(res == 0);
#elif HAVE_VIRTUALALLOC
#ifdef DEBUG
BOOL res =
#endif
VirtualFree((LPVOID) ptr, (SIZE_T) 0, MEM_RELEASE);
ERTS_MMAP_ASSERT(res != 0);
#else
# error "missing munmap() or similar"
#endif
}
#ifdef ERTS_HAVE_OS_MREMAP
# if HAVE_MREMAP
# if defined(__NetBSD__)
# define ERTS_MREMAP_FLAGS (0)
# else
# define ERTS_MREMAP_FLAGS (MREMAP_MAYMOVE)
# endif
# endif
static ERTS_INLINE void *
os_mremap(void *ptr, UWord old_size, UWord new_size, int try_superalign)
{
void *new_seg;
#if HAVE_MREMAP
new_seg = mremap(ptr, (size_t) old_size,
# if defined(__NetBSD__)
NULL,
# endif
(size_t) new_size, ERTS_MREMAP_FLAGS);
if (new_seg == (void *) MAP_FAILED)
return NULL;
return new_seg;
#else
# error "missing mremap() or similar"
#endif
}
#endif
#ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
#if HAVE_MMAP
#define ERTS_MMAP_RESERVE_PROT (ERTS_MMAP_PROT)
#define ERTS_MMAP_RESERVE_FLAGS (ERTS_MMAP_FLAGS|MAP_FIXED)
#define ERTS_MMAP_UNRESERVE_PROT (PROT_NONE)
#define ERTS_MMAP_UNRESERVE_FLAGS (ERTS_MMAP_FLAGS|MAP_NORESERVE|MAP_FIXED)
#define ERTS_MMAP_VIRTUAL_PROT (PROT_NONE)
#define ERTS_MMAP_VIRTUAL_FLAGS (ERTS_MMAP_FLAGS|MAP_NORESERVE)
static int
os_reserve_physical(char *ptr, UWord size)
{
void *res = mmap((void *) ptr, (size_t) size, ERTS_MMAP_RESERVE_PROT,
ERTS_MMAP_RESERVE_FLAGS, ERTS_MMAP_FD, 0);
if (res == (void *) MAP_FAILED)
return 0;
return 1;
}
static void
os_unreserve_physical(char *ptr, UWord size)
{
void *res = mmap((void *) ptr, (size_t) size, ERTS_MMAP_UNRESERVE_PROT,
ERTS_MMAP_UNRESERVE_FLAGS, ERTS_MMAP_FD, 0);
if (res == (void *) MAP_FAILED)
erl_exit(ERTS_ABORT_EXIT, "Failed to unreserve memory");
}
static void *
os_mmap_virtual(char *ptr, UWord size)
{
void *res = mmap((void *) ptr, (size_t) size, ERTS_MMAP_VIRTUAL_PROT,
ERTS_MMAP_VIRTUAL_FLAGS, ERTS_MMAP_FD, 0);
if (res == (void *) MAP_FAILED)
return NULL;
return res;
}
#else
#error "Missing reserve/unreserve physical memory implementation"
#endif
#endif /* ERTS_HAVE_OS_RESERVE_PHYSICAL_MEMORY */
#endif /* ERTS_HAVE_OS_MMAP */
static int reserve_noop(char *ptr, UWord size)
{
#ifdef ERTS_MMAP_DEBUG_FILL_AREAS
Uint32 *uip, *end = (Uint32 *) (ptr + size);
for (uip = (Uint32 *) ptr; uip < end; uip++)
ERTS_MMAP_ASSERT(*uip == (Uint32) 0xdeadbeef);
for (uip = (Uint32 *) ptr; uip < end; uip++)
*uip = (Uint32) 0xfeedfeed;
#endif
return 1;
}
static void unreserve_noop(char *ptr, UWord size)
{
#ifdef ERTS_MMAP_DEBUG_FILL_AREAS
Uint32 *uip, *end = (Uint32 *) (ptr + size);
for (uip = (Uint32 *) ptr; uip < end; uip++)
*uip = (Uint32) 0xdeadbeef;
#endif
}
void *
erts_mmap(Uint32 flags, UWord *sizep)
{
char *seg;
UWord asize = ERTS_PAGEALIGNED_CEILING(*sizep);
/* Map in premapped supercarrier */
if (mmap_state.supercarrier && !(ERTS_MMAPFLG_OS_ONLY & flags)) {
char *end;
ErtsFreeSegDesc *desc;
Uint32 superaligned = (ERTS_MMAPFLG_SUPERALIGNED & flags);
erts_smp_mtx_lock(&mmap_state.mtx);
if (!superaligned) {
desc = lookup_free_seg(&mmap_state.sua.map, asize);
if (desc) {
seg = desc->start;
end = seg+asize;
if (!mmap_state.reserve_physical(seg, asize))
goto supercarrier_reserve_failure;
if (desc->end == end) {
delete_free_seg(&mmap_state.sua.map, desc);
free_desc(desc);
}
else {
ERTS_MMAP_ASSERT(end < desc->end);
resize_free_seg(&mmap_state.sua.map, desc, end, desc->end);
}
ERTS_MMAP_SIZE_SC_SUA_INC(asize);
goto supercarrier_success;
}
if (asize <= mmap_state.sua.bot - mmap_state.sa.top) {
if (!mmap_state.reserve_physical(mmap_state.sua.bot - asize,
asize))
goto supercarrier_reserve_failure;
mmap_state.sua.bot -= asize;
seg = mmap_state.sua.bot;
ERTS_MMAP_SIZE_SC_SUA_INC(asize);
goto supercarrier_success;
}
}
asize = ERTS_SUPERALIGNED_CEILING(asize);
desc = lookup_free_seg(&mmap_state.sa.map, asize);
if (desc) {
seg = desc->start;
end = seg+asize;
if (!mmap_state.reserve_physical(seg, asize))
goto supercarrier_reserve_failure;
if (desc->end == end) {
delete_free_seg(&mmap_state.sa.map, desc);
free_desc(desc);
}
else {
ERTS_MMAP_ASSERT(end < desc->end);
resize_free_seg(&mmap_state.sa.map, desc, end, desc->end);
}
ERTS_MMAP_SIZE_SC_SA_INC(asize);
goto supercarrier_success;
}
if (superaligned) {
if (asize <= mmap_state.sua.bot - mmap_state.sa.top) {
seg = (void *) mmap_state.sa.top;
if (!mmap_state.reserve_physical(seg, asize))
goto supercarrier_reserve_failure;
mmap_state.sa.top += asize;
ERTS_MMAP_SIZE_SC_SA_INC(asize);
goto supercarrier_success;
}
desc = lookup_free_seg(&mmap_state.sua.map, asize + ERTS_SUPERALIGNED_SIZE);
if (desc) {
char *org_start = desc->start;
char *org_end = desc->end;
seg = (char *) ERTS_SUPERALIGNED_CEILING(org_start);
end = seg + asize;
if (!mmap_state.reserve_physical(seg, asize))
goto supercarrier_reserve_failure;
if (org_start != seg) {
ERTS_MMAP_ASSERT(org_start < seg);
resize_free_seg(&mmap_state.sua.map, desc, org_start, seg);
desc = NULL;
}
if (end != org_end) {
ERTS_MMAP_ASSERT(end < org_end);
if (desc)
resize_free_seg(&mmap_state.sua.map, desc, end, org_end);
else {
desc = alloc_desc();
if (!desc)
add_free_desc_area(end, org_end);
else
insert_free_seg(&mmap_state.sua.map, desc, end, org_end);
}
}
ERTS_MMAP_SIZE_SC_SA_INC(asize);
goto supercarrier_success;
}
}
erts_smp_mtx_unlock(&mmap_state.mtx);
}
#if ERTS_HAVE_OS_MMAP
/* Map using OS primitives */
if (!(ERTS_MMAPFLG_SUPERCARRIER_ONLY & flags) && !mmap_state.no_os_mmap) {
if (!(ERTS_MMAPFLG_SUPERALIGNED & flags)) {
seg = os_mmap(asize, 0);
if (!seg)
return NULL;
}
else {
asize = ERTS_SUPERALIGNED_CEILING(*sizep);
seg = os_mmap(asize, 1);
if (!seg)
return NULL;
if (!ERTS_IS_SUPERALIGNED(seg)) {
char *ptr;
UWord sz;
os_munmap(seg, asize);
ptr = os_mmap(asize + ERTS_SUPERALIGNED_SIZE, 1);
if (!ptr)
return NULL;
seg = (char *) ERTS_SUPERALIGNED_CEILING(ptr);
sz = (UWord) (seg - ptr);
ERTS_MMAP_ASSERT(sz <= ERTS_SUPERALIGNED_SIZE);
if (sz)
os_munmap(ptr, sz);
sz = ERTS_SUPERALIGNED_SIZE - sz;
if (sz)
os_munmap(seg+asize, sz);
}
}
ERTS_MMAP_SIZE_OS_INC(asize);
*sizep = asize;
return (void *) seg;
}
#endif
*sizep = 0;
return NULL;
supercarrier_success:
#ifdef ERTS_MMAP_DEBUG
if ((ERTS_MMAPFLG_SUPERALIGNED & flags)
|| ERTS_MMAP_IN_SUPERALIGNED_AREA(seg)) {
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(seg));
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(asize));
}
else {
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(seg));
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(asize));
}
#endif
erts_smp_mtx_unlock(&mmap_state.mtx);
*sizep = asize;
return (void *) seg;
supercarrier_reserve_failure:
erts_smp_mtx_unlock(&mmap_state.mtx);
*sizep = 0;
return NULL;
}
void
erts_munmap(Uint32 flags, void **ptrp, UWord *sizep)
{
void *ptr = *ptrp;
UWord size = *sizep;
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(ptr));
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(size));
if (!ERTS_MMAP_IN_SUPERCARRIER(ptr)) {
ERTS_MMAP_ASSERT(!mmap_state.no_os_mmap);
#if ERTS_HAVE_OS_MMAP
ERTS_MMAP_SIZE_OS_DEC(size);
os_munmap(ptr, size);
#endif
}
else {
char *start, *end;
ErtsFreeSegMap *map;
ErtsFreeSegDesc *prev, *next, *desc;
ERTS_MMAP_ASSERT(mmap_state.supercarrier);
start = (char *) ptr;
end = start + size;
erts_smp_mtx_lock(&mmap_state.mtx);
if (ERTS_MMAP_IN_SUPERALIGNED_AREA(ptr)) {
start = (char *) ERTS_SUPERALIGNED_CEILING(start);
end = (char *) ERTS_SUPERALIGNED_FLOOR(end);
size = (UWord) (end - start);
*ptrp = start;
*sizep = size;
map = &mmap_state.sa.map;
adjacent_free_seg(map, start, end, &prev, &next);
ERTS_MMAP_SIZE_SC_SA_DEC(size);
if (end == mmap_state.sa.top) {
ERTS_MMAP_ASSERT(!next);
if (prev) {
start = prev->start;
delete_free_seg(map, prev);
free_desc(prev);
}
mmap_state.sa.top = start;
goto supercarrier_success;
}
}
else {
ERTS_MMAP_ASSERT(ERTS_MMAP_IN_SUPERUNALIGNED_AREA(ptr));
map = &mmap_state.sua.map;
adjacent_free_seg(map, start, end, &prev, &next);
ERTS_MMAP_SIZE_SC_SUA_DEC(size);
if (start == mmap_state.sua.bot) {
ERTS_MMAP_ASSERT(!prev);
if (next) {
end = next->end;
delete_free_seg(map, next);
free_desc(next);
}
mmap_state.sua.bot = end;
goto supercarrier_success;
}
}
desc = NULL;
if (next) {
ERTS_MMAP_ASSERT(end < next->end);
end = next->end;
if (prev) {
delete_free_seg(map, next);
free_desc(next);
goto save_prev;
}
desc = next;
} else if (prev) {
save_prev:
ERTS_MMAP_ASSERT(prev->start < start);
start = prev->start;
desc = prev;
}
if (desc)
resize_free_seg(map, desc, start, end);
else {
desc = alloc_desc();
if (desc)
insert_free_seg(map, desc, start, end);
else {
if (map == &mmap_state.sa.map)
ERTS_MMAP_SIZE_SC_SA_INC(size);
else
ERTS_MMAP_SIZE_SC_SUA_INC(size);
add_free_desc_area(start, end);
}
}
supercarrier_success:
erts_smp_mtx_unlock(&mmap_state.mtx);
mmap_state.unreserve_physical((char *) ptr, size);
}
}
static void *
remap_move(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
{
UWord size = *sizep;
UWord um_size = old_size;
void *um_ptr = ptr;
void *new_ptr = erts_mmap(flags, &size);
if (!new_ptr)
return NULL;
*sizep = size;
if (old_size < size)
size = old_size;
sys_memcpy(new_ptr, ptr, (size_t) size);
erts_munmap(flags, &um_ptr, &um_size);
ERTS_MMAP_ASSERT(um_ptr == ptr);
ERTS_MMAP_ASSERT(um_size == old_size);
return new_ptr;
}
void *
erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
{
void *new_ptr;
Uint32 superaligned;
UWord asize;
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(ptr));
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(old_size));
ERTS_MMAP_ASSERT(sizep && ERTS_IS_PAGEALIGNED(*sizep));
if (!ERTS_MMAP_IN_SUPERCARRIER(ptr)) {
ERTS_MMAP_ASSERT(!mmap_state.no_os_mmap);
if (!(ERTS_MMAPFLG_OS_ONLY & flags) && mmap_state.supercarrier) {
new_ptr = remap_move(ERTS_MMAPFLG_SUPERCARRIER_ONLY|flags, ptr,
old_size, sizep);
if (new_ptr)
return new_ptr;
}
if (ERTS_MMAPFLG_SUPERCARRIER_ONLY & flags)
return NULL;
#if ERTS_HAVE_OS_MREMAP || ERTS_HAVE_GENUINE_OS_MMAP
superaligned = (ERTS_MMAPFLG_SUPERALIGNED & flags);
if (superaligned) {
asize = ERTS_SUPERALIGNED_CEILING(*sizep);
if (asize == old_size && ERTS_IS_SUPERALIGNED(ptr)) {
*sizep = asize;
return ptr;
}
}
else {
asize = ERTS_PAGEALIGNED_CEILING(*sizep);
if (asize == old_size) {
*sizep = asize;
return ptr;
}
}
#if ERTS_HAVE_GENUINE_OS_MMAP
if (asize < old_size
&& (!superaligned
|| ERTS_IS_SUPERALIGNED(ptr))) {
UWord um_sz;
new_ptr = ((char *) ptr) + asize;
ERTS_MMAP_ASSERT((((char *)ptr) + old_size) > (char *) new_ptr);
um_sz = (UWord) ((((char *) ptr) + old_size) - (char *) new_ptr);
ERTS_MMAP_SIZE_OS_DEC(um_sz);
os_munmap(new_ptr, um_sz);
*sizep = asize;
return ptr;
}
#endif
#if ERTS_HAVE_OS_MREMAP
if (superaligned)
return remap_move(flags, new_ptr, old_size, sizep);
else {
new_ptr = os_mremap(ptr, old_size, asize, 0);
if (!new_ptr)
return NULL;
if (asize > old_size)
ERTS_MMAP_SIZE_OS_INC(asize - old_size);
else
ERTS_MMAP_SIZE_OS_DEC(old_size - asize);
*sizep = asize;
return new_ptr;
}
#endif
#endif
}
else { /* In super carrier */
char *start, *end, *new_end;
ErtsFreeSegMap *map;
ErtsFreeSegDesc *prev, *next, *desc;
ERTS_MMAP_ASSERT(mmap_state.supercarrier);
if (ERTS_MMAPFLG_OS_ONLY & flags)
return remap_move(flags, ptr, old_size, sizep);
superaligned = (ERTS_MMAPFLG_SUPERALIGNED & flags);
asize = (superaligned
? ERTS_SUPERALIGNED_CEILING(*sizep)
: ERTS_PAGEALIGNED_CEILING(*sizep));
erts_smp_mtx_lock(&mmap_state.mtx);
if (ERTS_MMAP_IN_SUPERALIGNED_AREA(ptr)
? (!superaligned && lookup_free_seg(&mmap_state.sua.map, asize))
: (superaligned && lookup_free_seg(&mmap_state.sa.map, asize))) {
erts_smp_mtx_unlock(&mmap_state.mtx);
/*
* Segment currently in wrong area (due to a previous memory
* shortage), move it to the right area.
* (remap_move() will succeed)
*/
return remap_move(ERTS_MMAPFLG_SUPERCARRIER_ONLY|flags, ptr,
old_size, sizep);
}
if (asize == old_size) {
new_ptr = ptr;
goto supercarrier_resize_success;
}
start = (char *) ptr;
end = start + old_size;
new_end = start+asize;
if (asize < old_size) {
new_ptr = ptr;
if (!ERTS_MMAP_IN_SUPERALIGNED_AREA(ptr)) {
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(ptr));
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(old_size));
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(asize));
map = &mmap_state.sua.map;
ERTS_MMAP_SIZE_SC_SUA_DEC(old_size - asize);
}
else {
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(ptr));
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(old_size));
if (!superaligned) {
/* must be a superaligned size in this area */
asize = ERTS_SUPERALIGNED_CEILING(asize);
ERTS_MMAP_ASSERT(asize <= old_size);
if (asize == old_size)
goto supercarrier_resize_success;
new_end = start+asize;
}
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(asize));
if (end == mmap_state.sa.top) {
mmap_state.sa.top = new_end;
mmap_state.unreserve_physical(((char *) ptr) + asize,
old_size - asize);
goto supercarrier_resize_success;
}
ERTS_MMAP_SIZE_SC_SA_DEC(old_size - asize);
map = &mmap_state.sa.map;
}
adjacent_free_seg(map, start, end, &prev, &next);
if (next)
resize_free_seg(map, next, new_end, next->end);
else {
desc = alloc_desc();
if (desc)
insert_free_seg(map, desc, new_end, end);
else {
if (map == &mmap_state.sa.map)
ERTS_MMAP_SIZE_SC_SA_INC(old_size - asize);
else
ERTS_MMAP_SIZE_SC_SUA_INC(old_size - asize);
add_free_desc_area(new_end, end);
goto supercarrier_resize_success;
}
}
mmap_state.unreserve_physical(((char *) ptr) + asize,
old_size - asize);
goto supercarrier_resize_success;
}
if (!ERTS_MMAP_IN_SUPERALIGNED_AREA(ptr)) {
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(ptr));
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(old_size));
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(asize));
adjacent_free_seg(&mmap_state.sua.map, start, end, &prev, &next);
if (next && new_end <= next->end) {
if (!mmap_state.reserve_physical(((char *) ptr) + old_size,
asize - old_size))
goto supercarrier_reserve_failure;
if (new_end < next->end)
resize_free_seg(&mmap_state.sua.map, next, new_end, next->end);
else {
delete_free_seg(&mmap_state.sua.map, next);
free_desc(next);
}
new_ptr = ptr;
ERTS_MMAP_SIZE_SC_SUA_INC(asize - old_size);
goto supercarrier_resize_success;
}
}
else { /* Superaligned area */
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(ptr));
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(old_size));
if (!superaligned) {
/* must be a superaligned size in this area */
asize = ERTS_PAGEALIGNED_CEILING(asize);
new_end = start+asize;
}
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(asize));
if (end == mmap_state.sa.top) {
if (new_end <= mmap_state.sua.bot) {
if (!mmap_state.reserve_physical(((char *) ptr) + old_size,
asize - old_size))
goto supercarrier_reserve_failure;
mmap_state.sa.top = new_end;
new_ptr = ptr;
ERTS_MMAP_SIZE_SC_SA_INC(asize - old_size);
goto supercarrier_resize_success;
}
}
else {
adjacent_free_seg(&mmap_state.sa.map, start, end, &prev, &next);
if (next && new_end <= next->end) {
if (!mmap_state.reserve_physical(((char *) ptr) + old_size,
asize - old_size))
goto supercarrier_reserve_failure;
if (new_end < next->end)
resize_free_seg(&mmap_state.sa.map, next, new_end, next->end);
else {
delete_free_seg(&mmap_state.sa.map, next);
free_desc(next);
}
new_ptr = ptr;
ERTS_MMAP_SIZE_SC_SA_INC(asize - old_size);
goto supercarrier_resize_success;
}
}
}
erts_smp_mtx_unlock(&mmap_state.mtx);
/* Failed to resize... */
}
return remap_move(flags, ptr, old_size, sizep);
supercarrier_resize_success:
#ifdef ERTS_MMAP_DEBUG
if ((ERTS_MMAPFLG_SUPERALIGNED & flags)
|| ERTS_MMAP_IN_SUPERALIGNED_AREA(new_ptr)) {
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(new_ptr));
ERTS_MMAP_ASSERT(ERTS_IS_SUPERALIGNED(asize));
}
else {
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(new_ptr));
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(asize));
}
#endif
erts_smp_mtx_unlock(&mmap_state.mtx);
*sizep = asize;
return new_ptr;
supercarrier_reserve_failure:
erts_smp_mtx_unlock(&mmap_state.mtx);
*sizep = 0;
return NULL;
}
int erts_mmap_in_supercarrier(void *ptr)
{
return ERTS_MMAP_IN_SUPERCARRIER(ptr);
}
void
erts_mmap_init(ErtsMMapInit *init)
{
int virtual_map = 0;
char *start = NULL, *end = NULL;
UWord pagesize;
#if defined(__WIN32__)
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
pagesize = (UWord) sysinfo.dwPageSize;
#elif defined(_SC_PAGESIZE)
pagesize = (UWord) sysconf(_SC_PAGESIZE);
#elif defined(HAVE_GETPAGESIZE)
pagesize = (UWord) getpagesize();
#else
# error "Do not know how to get page size"
#endif
#if defined(HARD_DEBUG) || 0
erts_fprintf(stderr, "erts_mmap: scs = %bpu\n", init->scs);
erts_fprintf(stderr, "erts_mmap: sco = %i\n", init->sco);
erts_fprintf(stderr, "erts_mmap: scmgc = %i\n", init->scmgc);
#endif
erts_page_inv_mask = pagesize - 1;
if (pagesize & erts_page_inv_mask)
erl_exit(-1, "erts_mmap: Invalid pagesize: %bpu\n",
pagesize);
erts_have_erts_mmap = 0;
mmap_state.reserve_physical = reserve_noop;
mmap_state.unreserve_physical = unreserve_noop;
#if HAVE_MMAP && !defined(MAP_ANON)
mmap_state.mmap_fd = open("/dev/zero", O_RDWR);
if (mmap_state.mmap_fd < 0)
erl_exit(-1, "erts_mmap: Failed to open /dev/zero\n");
#endif
erts_smp_mtx_init(&mmap_state.mtx, "erts_mmap");
#ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
if (init->virtual_range.start) {
char *ptr;
UWord sz;
ptr = (char *) ERTS_PAGEALIGNED_CEILING(init->virtual_range.start);
end = (char *) ERTS_PAGEALIGNED_FLOOR(init->virtual_range.end);
sz = end - ptr;
start = os_mmap_virtual(ptr, sz);
if (!start || start > ptr || start >= end)
erl_exit(-1,
"erts_mmap: Failed to create virtual range for super carrier\n");
sz = start - ptr;
if (sz)
os_munmap(end, sz);
mmap_state.reserve_physical = os_reserve_physical;
mmap_state.unreserve_physical = os_unreserve_physical;
virtual_map = 1;
}
else
#endif
if (init->predefined_area.start) {
start = init->predefined_area.start;
end = init->predefined_area.end;
if (end != (void *) 0 && end < start)
end = start;
}
#if ERTS_HAVE_OS_MMAP
else if (init->scs) {
UWord sz;
sz = ERTS_PAGEALIGNED_CEILING(init->scs);
#ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
if (!init->scrpm) {
start = os_mmap_virtual(NULL, sz);
mmap_state.reserve_physical = os_reserve_physical;
mmap_state.unreserve_physical = os_unreserve_physical;
virtual_map = 1;
}
else
#endif
{
/*
* The whole supercarrier will by physically
* reserved all the time.
*/
start = os_mmap(sz, 1);
}
if (!start)
erl_exit(-1,
"erts_mmap: Failed to create super carrier of size %bpu MB\n",
init->scs/1024/1024);
end = start + sz;
#ifdef ERTS_MMAP_DEBUG_FILL_AREAS
if (!virtual_map) {
Uint32 *uip;
for (uip = (Uint32 *) start; uip < (Uint32 *) end; uip++)
*uip = (Uint32) 0xdeadbeef;
}
#endif
}
if (!mmap_state.no_os_mmap)
erts_have_erts_mmap |= ERTS_HAVE_ERTS_OS_MMAP;
#endif
mmap_state.size.supercarrier.total = 0;
mmap_state.size.supercarrier.used.total = 0;
mmap_state.size.supercarrier.used.sa = 0;
mmap_state.size.supercarrier.used.sua = 0;
mmap_state.size.os.used = 0;
if (!start) {
mmap_state.sa.bot = NULL;
mmap_state.sua.top = NULL;
mmap_state.sa.bot = NULL;
mmap_state.sua.top = NULL;
mmap_state.no_os_mmap = 0;
}
else {
size_t desc_size;
mmap_state.no_os_mmap = init->sco;
desc_size = init->scmgc;
if (desc_size < 100)
desc_size = 100;
desc_size *= sizeof(ErtsFreeSegDesc);
if ((desc_size
+ ERTS_SUPERALIGNED_SIZE
+ ERTS_PAGEALIGNED_SIZE) > end - start)
erl_exit(-1, "erts_mmap: No space for segments in super carrier\n");
mmap_state.sa.bot = start;
mmap_state.sa.bot += desc_size;
mmap_state.sa.bot = (char *) ERTS_SUPERALIGNED_CEILING(mmap_state.sa.bot);
mmap_state.sa.top = mmap_state.sa.bot;
mmap_state.sua.top = (char *) ERTS_SUPERALIGNED_FLOOR(end);
mmap_state.sua.bot = mmap_state.sua.top;
mmap_state.size.os.used += (UWord) (mmap_state.sa.bot - start);
if (end == (void *) 0) {
/*
* Very unlikely, but we need a guarantee
* that `mmap_state.sua.top` always will
* compare as larger than all segment pointers
* into the super carrier...
*/
mmap_state.sua.top -= ERTS_PAGEALIGNED_SIZE;
mmap_state.size.os.used += ERTS_PAGEALIGNED_SIZE;
}
mmap_state.size.supercarrier.total = (UWord) (mmap_state.sua.top - mmap_state.sa.bot);
/*
* Area before (and after) super carrier
* will be used for free segment descritors.
*/
mmap_state.desc_free_list = NULL;
#ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
if (virtual_map && mmap_state.sa.bot - start > 0)
os_reserve_physical(start, mmap_state.sa.bot - start);
#endif
add_free_desc_area(start, mmap_state.sa.bot);
#ifdef ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION
if (virtual_map && end - mmap_state.sua.top > 0)
os_reserve_physical(mmap_state.sua.top, end - mmap_state.sua.top);
#endif
add_free_desc_area(mmap_state.sua.top, end);
init_free_seg_map(&mmap_state.sa.map, 0);
init_free_seg_map(&mmap_state.sua.map, 1);
mmap_state.supercarrier = 1;
erts_have_erts_mmap |= ERTS_HAVE_ERTS_SUPERCARRIER_MMAP;
}
#if !ERTS_HAVE_OS_MMAP
mmap_state.no_os_mmap = 1;
#endif
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
* Debug functions *
\* */
#ifdef HARD_DEBUG
static int rbt_assert_is_member(RBTNode* root, RBTNode* node)
{
while (node != root) {
RBT_ASSERT(parent(node));
RBT_ASSERT(parent(node)->left == node || parent(node)->right == node);
node = parent(node);
}
return 1;
}
#if 1 /*SVERK*/
# define PRINT_TREE
#else
# undef PRINT_TREE
#endif
#ifdef PRINT_TREE
static void print_tree(enum SortOrder order, RBTNode*);
#endif
/*
* Checks that the order between parent and children are correct,
* and that the Red-Black Tree properies are satisfied. if size > 0,
* check_tree() returns the node that satisfies "address order first fit"
*
* The Red-Black Tree properies are:
* 1. Every node is either red or black.
* 2. Every leaf (NIL) is black.
* 3. If a node is red, then both its children are black.
* 4. Every simple path from a node to a descendant leaf
* contains the same number of black nodes.
*
*/
static RBTNode *
check_tree(RBTree* tree, Uint size)
{
RBTNode *res = NULL;
Sint blacks;
Sint curr_blacks;
RBTNode *x;
Uint depth, max_depth, node_cnt;
ErtsFreeSegDesc* seg = NULL;
ErtsFreeSegDesc* prev_seg = NULL;
enum { RECURSE_LEFT, CHECK_NODE, RECURSE_RIGHT, RETURN_TO_PARENT }state;
#ifdef PRINT_TREE
print_tree(tree->order, tree->root);
#endif
if (!tree->root)
return res;
x = tree->root;
RBT_ASSERT(IS_BLACK(x));
RBT_ASSERT(!parent(x));
curr_blacks = 1;
blacks = -1;
depth = 1;
max_depth = 0;
node_cnt = 0;
state = RECURSE_LEFT;
/* Traverse tree in sorting order */
while (x) {
switch (state) {
case RECURSE_LEFT:
if (x->left) {
RBT_ASSERT(parent(x->left) == x);
x = x->left;
++depth;
if (IS_BLACK(x))
curr_blacks++;
state = RECURSE_LEFT;
}
else {
if (blacks < 0)
blacks = curr_blacks;
RBT_ASSERT(blacks == curr_blacks);
state = CHECK_NODE;
}
break;
case CHECK_NODE:
++node_cnt;
if (depth > max_depth)
max_depth = depth;
if (IS_RED(x)) {
RBT_ASSERT(IS_BLACK(x->right));
RBT_ASSERT(IS_BLACK(x->left));
}
RBT_ASSERT(parent(x) || x == tree->root);
if (x->left) {
RBT_ASSERT(cmp_blocks(tree->order, x->left, x) < 0);
}
if (x->right) {
RBT_ASSERT(cmp_blocks(tree->order, x->right, x) > 0);
}
seg = node_to_desc(tree->order, x);
RBT_ASSERT(seg->start < seg->end);
if (size && (seg->end - seg->start) >= size) {
if (!res || cmp_blocks(tree->order, x, res) < 0) {
res = x;
}
}
if (tree->order == ADDR_ORDER) {
RBT_ASSERT(!prev_seg || prev_seg->end < seg->start);
prev_seg = seg;
}
state = RECURSE_RIGHT;
break;
case RECURSE_RIGHT:
if (x->right) {
RBT_ASSERT(parent(x->right) == x);
x = x->right;
++depth;
if (IS_BLACK(x))
curr_blacks++;
state = RECURSE_LEFT;
}
else {
if (blacks < 0)
blacks = curr_blacks;
RBT_ASSERT(blacks == curr_blacks);
state = RETURN_TO_PARENT;
}
break;
case RETURN_TO_PARENT:
if (parent(x)) {
if (x == parent(x)->left) {
state = CHECK_NODE;
}
else {
RBT_ASSERT(x == parent(x)->right);
state = RETURN_TO_PARENT;
}
}
if (IS_BLACK(x))
curr_blacks--;
x = parent(x);
--depth;
break;
}
}
RBT_ASSERT(depth == 0 || (!tree->root && depth==1));
RBT_ASSERT(curr_blacks == 0);
RBT_ASSERT((1 << (max_depth/2)) <= node_cnt);
return res;
}
#endif /* HARD_DEBUG */
#ifdef PRINT_TREE
#define INDENT_STEP 2
#include <stdio.h>
static void
print_tree_aux(enum SortOrder order, RBTNode *x, int indent)
{
int i;
if (x) {
ErtsFreeSegDesc* desc = node_to_desc(order, x);
print_tree_aux(order, x->right, indent + INDENT_STEP);
for (i = 0; i < indent; i++) {
putc(' ', stderr);
}
fprintf(stderr, "%s: sz=%lx [%p - %p] desc=%p\r\n",
IS_BLACK(x) ? "BLACK" : "RED",
desc->end - desc->start, desc->start, desc->end, desc);
print_tree_aux(order, x->left, indent + INDENT_STEP);
}
}
static void
print_tree(enum SortOrder order, RBTNode* root)
{
static const char* type[] = {"Address","Size-Address","Size-RevAddress"};
fprintf(stderr, " --- %s ordered tree begin ---\r\n", type[order]);
print_tree_aux(order, root, 0);
fprintf(stderr, " --- %s ordered tree end ---\r\n", type[order]);
}
#endif /* PRINT_TREE */
void test_it(void)
{
ErtsFreeSegMap map;
ErtsFreeSegDesc *desc, *under, *over, *d1, *d2;
int i;
for (i=0; i<2; i++) {
init_free_seg_map(&map, i);
insert_free_seg(&map, alloc_desc(), (char*)0x11000, (char*)0x12000);
HARD_CHECK_TREE(&map.atree, 0); HARD_CHECK_TREE(&map.stree, 0);
insert_free_seg(&map, alloc_desc(), (char*)0x13000, (char*)0x14000);
HARD_CHECK_TREE(&map.atree, 0); HARD_CHECK_TREE(&map.stree, 0);
insert_free_seg(&map, alloc_desc(), (char*)0x15000, (char*)0x17000);
HARD_CHECK_TREE(&map.atree, 0); HARD_CHECK_TREE(&map.stree, 0);
insert_free_seg(&map, alloc_desc(), (char*)0x8000, (char*)0x10000);
HARD_CHECK_TREE(&map.atree, 0); HARD_CHECK_TREE(&map.stree, 0);
desc = lookup_free_seg(&map, 0x500);
ERTS_ASSERT(desc->start == (char*)(i?0x13000L:0x11000L));
desc = lookup_free_seg(&map, 0x1500);
ERTS_ASSERT(desc->start == (char*)0x15000);
adjacent_free_seg(&map, (char*)0x6666, (char*)0x7777, &under, &over);
ERTS_ASSERT(!under && !over);
adjacent_free_seg(&map, (char*)0x6666, (char*)0x8000, &under, &over);
ERTS_ASSERT(!under && over->start == (char*)0x8000);
adjacent_free_seg(&map, (char*)0x10000, (char*)0x10500, &under, &over);
ERTS_ASSERT(under->end == (char*)0x10000 && !over);
adjacent_free_seg(&map, (char*)0x10100, (char*)0x10500, &under, &over);
ERTS_ASSERT(!under && !over);
adjacent_free_seg(&map, (char*)0x10100, (char*)0x11000, &under, &over);
ERTS_ASSERT(!under && over && over->start == (char*)0x11000);
adjacent_free_seg(&map, (char*)0x12000, (char*)0x12500, &under, &over);
ERTS_ASSERT(under && under->end == (char*)0x12000 && !over);
adjacent_free_seg(&map, (char*)0x12000, (char*)0x13000, &under, &over);
ERTS_ASSERT(under && under->end == (char*)0x12000 &&
over && over->start == (char*)0x13000);
adjacent_free_seg(&map, (char*)0x12500, (char*)0x13000, &under, &over);
ERTS_ASSERT(!under && over && over->start == (char*)0x13000);
d1 = lookup_free_seg(&map, 0x500);
ERTS_ASSERT(d1->start == (char*)(i?0x13000L:0x11000L));
resize_free_seg(&map, d1, d1->start - 0x800, (char*)d1->end);
HARD_CHECK_TREE(&map.atree, 0); HARD_CHECK_TREE(&map.stree, 0);
d2 = lookup_free_seg(&map, 0x1200);
ERTS_ASSERT(d2 == d1);
delete_free_seg(&map, d1);
HARD_CHECK_TREE(&map.atree, 0); HARD_CHECK_TREE(&map.stree, 0);
d1 = lookup_free_seg(&map, 0x1200);
ERTS_ASSERT(d1->start == (char*)0x15000);
}
}