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server-skynet-source-3rd-je.../src/arena.c
Jason Evans a3b3386ddd Avoid arena_prof_accum()-related locking when possible. 
Refactor arena_prof_accum() and its callers to avoid arena locking when
prof_interval is 0 (as when profiling is disabled).

Reported by Ben Maurer.
2012-11-13 13:47:53 -08:00

2356 lines
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#define JEMALLOC_ARENA_C_
#include "jemalloc/internal/jemalloc_internal.h"
/******************************************************************************/
/* Data. */
ssize_t opt_lg_dirty_mult = LG_DIRTY_MULT_DEFAULT;
arena_bin_info_t arena_bin_info[NBINS];
JEMALLOC_ALIGNED(CACHELINE)
const uint8_t small_size2bin[] = {
#define S2B_8(i) i,
#define S2B_16(i) S2B_8(i) S2B_8(i)
#define S2B_32(i) S2B_16(i) S2B_16(i)
#define S2B_64(i) S2B_32(i) S2B_32(i)
#define S2B_128(i) S2B_64(i) S2B_64(i)
#define S2B_256(i) S2B_128(i) S2B_128(i)
#define S2B_512(i) S2B_256(i) S2B_256(i)
#define S2B_1024(i) S2B_512(i) S2B_512(i)
#define S2B_2048(i) S2B_1024(i) S2B_1024(i)
#define S2B_4096(i) S2B_2048(i) S2B_2048(i)
#define S2B_8192(i) S2B_4096(i) S2B_4096(i)
#define SIZE_CLASS(bin, delta, size) \
S2B_##delta(bin)
SIZE_CLASSES
#undef S2B_8
#undef S2B_16
#undef S2B_32
#undef S2B_64
#undef S2B_128
#undef S2B_256
#undef S2B_512
#undef S2B_1024
#undef S2B_2048
#undef S2B_4096
#undef S2B_8192
#undef SIZE_CLASS
};
/******************************************************************************/
/* Function prototypes for non-inline static functions. */
static void arena_avail_insert(arena_t *arena, arena_chunk_t *chunk,
size_t pageind, size_t npages, bool maybe_adjac_pred,
bool maybe_adjac_succ);
static void arena_avail_remove(arena_t *arena, arena_chunk_t *chunk,
size_t pageind, size_t npages, bool maybe_adjac_pred,
bool maybe_adjac_succ);
static void arena_run_split(arena_t *arena, arena_run_t *run, size_t size,
bool large, size_t binind, bool zero);
static arena_chunk_t *arena_chunk_alloc(arena_t *arena);
static void arena_chunk_dealloc(arena_t *arena, arena_chunk_t *chunk);
static arena_run_t *arena_run_alloc_helper(arena_t *arena, size_t size,
bool large, size_t binind, bool zero);
static arena_run_t *arena_run_alloc(arena_t *arena, size_t size, bool large,
size_t binind, bool zero);
static arena_chunk_t *chunks_dirty_iter_cb(arena_chunk_tree_t *tree,
arena_chunk_t *chunk, void *arg);
static void arena_purge(arena_t *arena, bool all);
static void arena_run_dalloc(arena_t *arena, arena_run_t *run, bool dirty,
bool cleaned);
static void arena_run_trim_head(arena_t *arena, arena_chunk_t *chunk,
arena_run_t *run, size_t oldsize, size_t newsize);
static void arena_run_trim_tail(arena_t *arena, arena_chunk_t *chunk,
arena_run_t *run, size_t oldsize, size_t newsize, bool dirty);
static arena_run_t *arena_bin_runs_first(arena_bin_t *bin);
static void arena_bin_runs_insert(arena_bin_t *bin, arena_run_t *run);
static void arena_bin_runs_remove(arena_bin_t *bin, arena_run_t *run);
static arena_run_t *arena_bin_nonfull_run_tryget(arena_bin_t *bin);
static arena_run_t *arena_bin_nonfull_run_get(arena_t *arena, arena_bin_t *bin);
static void *arena_bin_malloc_hard(arena_t *arena, arena_bin_t *bin);
static void arena_dissociate_bin_run(arena_chunk_t *chunk, arena_run_t *run,
arena_bin_t *bin);
static void arena_dalloc_bin_run(arena_t *arena, arena_chunk_t *chunk,
arena_run_t *run, arena_bin_t *bin);
static void arena_bin_lower_run(arena_t *arena, arena_chunk_t *chunk,
arena_run_t *run, arena_bin_t *bin);
static void arena_ralloc_large_shrink(arena_t *arena, arena_chunk_t *chunk,
void *ptr, size_t oldsize, size_t size);
static bool arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk,
void *ptr, size_t oldsize, size_t size, size_t extra, bool zero);
static bool arena_ralloc_large(void *ptr, size_t oldsize, size_t size,
size_t extra, bool zero);
static size_t bin_info_run_size_calc(arena_bin_info_t *bin_info,
size_t min_run_size);
static void bin_info_init(void);
/******************************************************************************/
static inline int
arena_run_comp(arena_chunk_map_t *a, arena_chunk_map_t *b)
{
uintptr_t a_mapelm = (uintptr_t)a;
uintptr_t b_mapelm = (uintptr_t)b;
assert(a != NULL);
assert(b != NULL);
return ((a_mapelm > b_mapelm) - (a_mapelm < b_mapelm));
}
/* Generate red-black tree functions. */
rb_gen(static UNUSED, arena_run_tree_, arena_run_tree_t, arena_chunk_map_t,
u.rb_link, arena_run_comp)
static inline int
arena_avail_comp(arena_chunk_map_t *a, arena_chunk_map_t *b)
{
int ret;
size_t a_size = a->bits & ~PAGE_MASK;
size_t b_size = b->bits & ~PAGE_MASK;
ret = (a_size > b_size) - (a_size < b_size);
if (ret == 0) {
uintptr_t a_mapelm, b_mapelm;
if ((a->bits & CHUNK_MAP_KEY) != CHUNK_MAP_KEY)
a_mapelm = (uintptr_t)a;
else {
/*
* Treat keys as though they are lower than anything
* else.
*/
a_mapelm = 0;
}
b_mapelm = (uintptr_t)b;
ret = (a_mapelm > b_mapelm) - (a_mapelm < b_mapelm);
}
return (ret);
}
/* Generate red-black tree functions. */
rb_gen(static UNUSED, arena_avail_tree_, arena_avail_tree_t, arena_chunk_map_t,
u.rb_link, arena_avail_comp)
static inline int
arena_chunk_dirty_comp(arena_chunk_t *a, arena_chunk_t *b)
{
assert(a != NULL);
assert(b != NULL);
/*
* Short-circuit for self comparison. The following comparison code
* would come to the same result, but at the cost of executing the slow
* path.
*/
if (a == b)
return (0);
/*
* Order such that chunks with higher fragmentation are "less than"
* those with lower fragmentation -- purging order is from "least" to
* "greatest". Fragmentation is measured as:
*
* mean current avail run size
* --------------------------------
* mean defragmented avail run size
*
* navail
* -----------
* nruns_avail nruns_avail-nruns_adjac
* = ========================= = -----------------------
* navail nruns_avail
* -----------------------
* nruns_avail-nruns_adjac
*
* The following code multiplies away the denominator prior to
* comparison, in order to avoid division.
*
*/
{
size_t a_val = (a->nruns_avail - a->nruns_adjac) *
b->nruns_avail;
size_t b_val = (b->nruns_avail - b->nruns_adjac) *
a->nruns_avail;
if (a_val < b_val)
return (1);
if (a_val > b_val)
return (-1);
}
/*
* Break ties by chunk address. For fragmented chunks, report lower
* addresses as "lower", so that fragmentation reduction happens first
* at lower addresses. However, use the opposite ordering for
* unfragmented chunks, in order to increase the chances of
* re-allocating dirty runs.
*/
{
uintptr_t a_chunk = (uintptr_t)a;
uintptr_t b_chunk = (uintptr_t)b;
int ret = ((a_chunk > b_chunk) - (a_chunk < b_chunk));
if (a->nruns_adjac == 0) {
assert(b->nruns_adjac == 0);
ret = -ret;
}
return (ret);
}
}
/* Generate red-black tree functions. */
rb_gen(static UNUSED, arena_chunk_dirty_, arena_chunk_tree_t, arena_chunk_t,
dirty_link, arena_chunk_dirty_comp)
static inline bool
arena_avail_adjac_pred(arena_chunk_t *chunk, size_t pageind)
{
bool ret;
if (pageind-1 < map_bias)
ret = false;
else {
ret = (arena_mapbits_allocated_get(chunk, pageind-1) == 0);
assert(ret == false || arena_mapbits_dirty_get(chunk,
pageind-1) != arena_mapbits_dirty_get(chunk, pageind));
}
return (ret);
}
static inline bool
arena_avail_adjac_succ(arena_chunk_t *chunk, size_t pageind, size_t npages)
{
bool ret;
if (pageind+npages == chunk_npages)
ret = false;
else {
assert(pageind+npages < chunk_npages);
ret = (arena_mapbits_allocated_get(chunk, pageind+npages) == 0);
assert(ret == false || arena_mapbits_dirty_get(chunk, pageind)
!= arena_mapbits_dirty_get(chunk, pageind+npages));
}
return (ret);
}
static inline bool
arena_avail_adjac(arena_chunk_t *chunk, size_t pageind, size_t npages)
{
return (arena_avail_adjac_pred(chunk, pageind) ||
arena_avail_adjac_succ(chunk, pageind, npages));
}
static void
arena_avail_insert(arena_t *arena, arena_chunk_t *chunk, size_t pageind,
size_t npages, bool maybe_adjac_pred, bool maybe_adjac_succ)
{
assert(npages == (arena_mapbits_unallocated_size_get(chunk, pageind) >>
LG_PAGE));
/*
* chunks_dirty is keyed by nruns_{avail,adjac}, so the chunk must be
* removed and reinserted even if the run to be inserted is clean.
*/
if (chunk->ndirty != 0)
arena_chunk_dirty_remove(&arena->chunks_dirty, chunk);
if (maybe_adjac_pred && arena_avail_adjac_pred(chunk, pageind))
chunk->nruns_adjac++;
if (maybe_adjac_succ && arena_avail_adjac_succ(chunk, pageind, npages))
chunk->nruns_adjac++;
chunk->nruns_avail++;
assert(chunk->nruns_avail > chunk->nruns_adjac);
if (arena_mapbits_dirty_get(chunk, pageind) != 0) {
arena->ndirty += npages;
chunk->ndirty += npages;
}
if (chunk->ndirty != 0)
arena_chunk_dirty_insert(&arena->chunks_dirty, chunk);
arena_avail_tree_insert(&arena->runs_avail, arena_mapp_get(chunk,
pageind));
}
static void
arena_avail_remove(arena_t *arena, arena_chunk_t *chunk, size_t pageind,
size_t npages, bool maybe_adjac_pred, bool maybe_adjac_succ)
{
assert(npages == (arena_mapbits_unallocated_size_get(chunk, pageind) >>
LG_PAGE));
/*
* chunks_dirty is keyed by nruns_{avail,adjac}, so the chunk must be
* removed and reinserted even if the run to be removed is clean.
*/
if (chunk->ndirty != 0)
arena_chunk_dirty_remove(&arena->chunks_dirty, chunk);
if (maybe_adjac_pred && arena_avail_adjac_pred(chunk, pageind))
chunk->nruns_adjac--;
if (maybe_adjac_succ && arena_avail_adjac_succ(chunk, pageind, npages))
chunk->nruns_adjac--;
chunk->nruns_avail--;
assert(chunk->nruns_avail > chunk->nruns_adjac || (chunk->nruns_avail
== 0 && chunk->nruns_adjac == 0));
if (arena_mapbits_dirty_get(chunk, pageind) != 0) {
arena->ndirty -= npages;
chunk->ndirty -= npages;
}
if (chunk->ndirty != 0)
arena_chunk_dirty_insert(&arena->chunks_dirty, chunk);
arena_avail_tree_remove(&arena->runs_avail, arena_mapp_get(chunk,
pageind));
}
static inline void *
arena_run_reg_alloc(arena_run_t *run, arena_bin_info_t *bin_info)
{
void *ret;
unsigned regind;
bitmap_t *bitmap = (bitmap_t *)((uintptr_t)run +
(uintptr_t)bin_info->bitmap_offset);
assert(run->nfree > 0);
assert(bitmap_full(bitmap, &bin_info->bitmap_info) == false);
regind = bitmap_sfu(bitmap, &bin_info->bitmap_info);
ret = (void *)((uintptr_t)run + (uintptr_t)bin_info->reg0_offset +
(uintptr_t)(bin_info->reg_interval * regind));
run->nfree--;
if (regind == run->nextind)
run->nextind++;
assert(regind < run->nextind);
return (ret);
}
static inline void
arena_run_reg_dalloc(arena_run_t *run, void *ptr)
{
arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run);
size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
size_t mapbits = arena_mapbits_get(chunk, pageind);
size_t binind = arena_ptr_small_binind_get(ptr, mapbits);
arena_bin_info_t *bin_info = &arena_bin_info[binind];
unsigned regind = arena_run_regind(run, bin_info, ptr);
bitmap_t *bitmap = (bitmap_t *)((uintptr_t)run +
(uintptr_t)bin_info->bitmap_offset);
assert(run->nfree < bin_info->nregs);
/* Freeing an interior pointer can cause assertion failure. */
assert(((uintptr_t)ptr - ((uintptr_t)run +
(uintptr_t)bin_info->reg0_offset)) %
(uintptr_t)bin_info->reg_interval == 0);
assert((uintptr_t)ptr >= (uintptr_t)run +
(uintptr_t)bin_info->reg0_offset);
/* Freeing an unallocated pointer can cause assertion failure. */
assert(bitmap_get(bitmap, &bin_info->bitmap_info, regind));
bitmap_unset(bitmap, &bin_info->bitmap_info, regind);
run->nfree++;
}
static inline void
arena_chunk_validate_zeroed(arena_chunk_t *chunk, size_t run_ind)
{
size_t i;
UNUSED size_t *p = (size_t *)((uintptr_t)chunk + (run_ind << LG_PAGE));
for (i = 0; i < PAGE / sizeof(size_t); i++)
assert(p[i] == 0);
}
static void
arena_run_split(arena_t *arena, arena_run_t *run, size_t size, bool large,
size_t binind, bool zero)
{
arena_chunk_t *chunk;
size_t run_ind, total_pages, need_pages, rem_pages, i;
size_t flag_dirty;
assert((large && binind == BININD_INVALID) || (large == false && binind
!= BININD_INVALID));
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run);
run_ind = (unsigned)(((uintptr_t)run - (uintptr_t)chunk) >> LG_PAGE);
flag_dirty = arena_mapbits_dirty_get(chunk, run_ind);
total_pages = arena_mapbits_unallocated_size_get(chunk, run_ind) >>
LG_PAGE;
assert(arena_mapbits_dirty_get(chunk, run_ind+total_pages-1) ==
flag_dirty);
need_pages = (size >> LG_PAGE);
assert(need_pages > 0);
assert(need_pages <= total_pages);
rem_pages = total_pages - need_pages;
arena_avail_remove(arena, chunk, run_ind, total_pages, true, true);
if (config_stats) {
/*
* Update stats_cactive if nactive is crossing a chunk
* multiple.
*/
size_t cactive_diff = CHUNK_CEILING((arena->nactive +
need_pages) << LG_PAGE) - CHUNK_CEILING(arena->nactive <<
LG_PAGE);
if (cactive_diff != 0)
stats_cactive_add(cactive_diff);
}
arena->nactive += need_pages;
/* Keep track of trailing unused pages for later use. */
if (rem_pages > 0) {
if (flag_dirty != 0) {
arena_mapbits_unallocated_set(chunk, run_ind+need_pages,
(rem_pages << LG_PAGE), CHUNK_MAP_DIRTY);
arena_mapbits_unallocated_set(chunk,
run_ind+total_pages-1, (rem_pages << LG_PAGE),
CHUNK_MAP_DIRTY);
} else {
arena_mapbits_unallocated_set(chunk, run_ind+need_pages,
(rem_pages << LG_PAGE),
arena_mapbits_unzeroed_get(chunk,
run_ind+need_pages));
arena_mapbits_unallocated_set(chunk,
run_ind+total_pages-1, (rem_pages << LG_PAGE),
arena_mapbits_unzeroed_get(chunk,
run_ind+total_pages-1));
}
arena_avail_insert(arena, chunk, run_ind+need_pages, rem_pages,
false, true);
}
/*
* Update the page map separately for large vs. small runs, since it is
* possible to avoid iteration for large mallocs.
*/
if (large) {
if (zero) {
if (flag_dirty == 0) {
/*
* The run is clean, so some pages may be
* zeroed (i.e. never before touched).
*/
for (i = 0; i < need_pages; i++) {
if (arena_mapbits_unzeroed_get(chunk,
run_ind+i) != 0) {
VALGRIND_MAKE_MEM_UNDEFINED(
(void *)((uintptr_t)
chunk + ((run_ind+i) <<
LG_PAGE)), PAGE);
memset((void *)((uintptr_t)
chunk + ((run_ind+i) <<
LG_PAGE)), 0, PAGE);
} else if (config_debug) {
VALGRIND_MAKE_MEM_DEFINED(
(void *)((uintptr_t)
chunk + ((run_ind+i) <<
LG_PAGE)), PAGE);
arena_chunk_validate_zeroed(
chunk, run_ind+i);
}
}
} else {
/*
* The run is dirty, so all pages must be
* zeroed.
*/
VALGRIND_MAKE_MEM_UNDEFINED((void
*)((uintptr_t)chunk + (run_ind <<
LG_PAGE)), (need_pages << LG_PAGE));
memset((void *)((uintptr_t)chunk + (run_ind <<
LG_PAGE)), 0, (need_pages << LG_PAGE));
}
}
/*
* Set the last element first, in case the run only contains one
* page (i.e. both statements set the same element).
*/
arena_mapbits_large_set(chunk, run_ind+need_pages-1, 0,
flag_dirty);
arena_mapbits_large_set(chunk, run_ind, size, flag_dirty);
} else {
assert(zero == false);
/*
* Propagate the dirty and unzeroed flags to the allocated
* small run, so that arena_dalloc_bin_run() has the ability to
* conditionally trim clean pages.
*/
arena_mapbits_small_set(chunk, run_ind, 0, binind, flag_dirty);
/*
* The first page will always be dirtied during small run
* initialization, so a validation failure here would not
* actually cause an observable failure.
*/
if (config_debug && flag_dirty == 0 &&
arena_mapbits_unzeroed_get(chunk, run_ind) == 0)
arena_chunk_validate_zeroed(chunk, run_ind);
for (i = 1; i < need_pages - 1; i++) {
arena_mapbits_small_set(chunk, run_ind+i, i, binind, 0);
if (config_debug && flag_dirty == 0 &&
arena_mapbits_unzeroed_get(chunk, run_ind+i) == 0)
arena_chunk_validate_zeroed(chunk, run_ind+i);
}
arena_mapbits_small_set(chunk, run_ind+need_pages-1,
need_pages-1, binind, flag_dirty);
if (config_debug && flag_dirty == 0 &&
arena_mapbits_unzeroed_get(chunk, run_ind+need_pages-1) ==
0) {
arena_chunk_validate_zeroed(chunk,
run_ind+need_pages-1);
}
}
}
static arena_chunk_t *
arena_chunk_alloc(arena_t *arena)
{
arena_chunk_t *chunk;
size_t i;
if (arena->spare != NULL) {
chunk = arena->spare;
arena->spare = NULL;
assert(arena_mapbits_allocated_get(chunk, map_bias) == 0);
assert(arena_mapbits_allocated_get(chunk, chunk_npages-1) == 0);
assert(arena_mapbits_unallocated_size_get(chunk, map_bias) ==
arena_maxclass);
assert(arena_mapbits_unallocated_size_get(chunk,
chunk_npages-1) == arena_maxclass);
assert(arena_mapbits_dirty_get(chunk, map_bias) ==
arena_mapbits_dirty_get(chunk, chunk_npages-1));
} else {
bool zero;
size_t unzeroed;
zero = false;
malloc_mutex_unlock(&arena->lock);
chunk = (arena_chunk_t *)chunk_alloc(chunksize, chunksize,
false, &zero, arena->dss_prec);
malloc_mutex_lock(&arena->lock);
if (chunk == NULL)
return (NULL);
if (config_stats)
arena->stats.mapped += chunksize;
chunk->arena = arena;
/*
* Claim that no pages are in use, since the header is merely
* overhead.
*/
chunk->ndirty = 0;
chunk->nruns_avail = 0;
chunk->nruns_adjac = 0;
/*
* Initialize the map to contain one maximal free untouched run.
* Mark the pages as zeroed iff chunk_alloc() returned a zeroed
* chunk.
*/
unzeroed = zero ? 0 : CHUNK_MAP_UNZEROED;
arena_mapbits_unallocated_set(chunk, map_bias, arena_maxclass,
unzeroed);
/*
* There is no need to initialize the internal page map entries
* unless the chunk is not zeroed.
*/
if (zero == false) {
for (i = map_bias+1; i < chunk_npages-1; i++)
arena_mapbits_unzeroed_set(chunk, i, unzeroed);
} else if (config_debug) {
for (i = map_bias+1; i < chunk_npages-1; i++) {
assert(arena_mapbits_unzeroed_get(chunk, i) ==
unzeroed);
}
}
arena_mapbits_unallocated_set(chunk, chunk_npages-1,
arena_maxclass, unzeroed);
}
/* Insert the run into the runs_avail tree. */
arena_avail_insert(arena, chunk, map_bias, chunk_npages-map_bias,
false, false);
return (chunk);
}
static void
arena_chunk_dealloc(arena_t *arena, arena_chunk_t *chunk)
{
assert(arena_mapbits_allocated_get(chunk, map_bias) == 0);
assert(arena_mapbits_allocated_get(chunk, chunk_npages-1) == 0);
assert(arena_mapbits_unallocated_size_get(chunk, map_bias) ==
arena_maxclass);
assert(arena_mapbits_unallocated_size_get(chunk, chunk_npages-1) ==
arena_maxclass);
assert(arena_mapbits_dirty_get(chunk, map_bias) ==
arena_mapbits_dirty_get(chunk, chunk_npages-1));
/*
* Remove run from the runs_avail tree, so that the arena does not use
* it.
*/
arena_avail_remove(arena, chunk, map_bias, chunk_npages-map_bias,
false, false);
if (arena->spare != NULL) {
arena_chunk_t *spare = arena->spare;
arena->spare = chunk;
malloc_mutex_unlock(&arena->lock);
chunk_dealloc((void *)spare, chunksize, true);
malloc_mutex_lock(&arena->lock);
if (config_stats)
arena->stats.mapped -= chunksize;
} else
arena->spare = chunk;
}
static arena_run_t *
arena_run_alloc_helper(arena_t *arena, size_t size, bool large, size_t binind,
bool zero)
{
arena_run_t *run;
arena_chunk_map_t *mapelm, key;
key.bits = size | CHUNK_MAP_KEY;
mapelm = arena_avail_tree_nsearch(&arena->runs_avail, &key);
if (mapelm != NULL) {
arena_chunk_t *run_chunk = CHUNK_ADDR2BASE(mapelm);
size_t pageind = (((uintptr_t)mapelm -
(uintptr_t)run_chunk->map) / sizeof(arena_chunk_map_t))
+ map_bias;
run = (arena_run_t *)((uintptr_t)run_chunk + (pageind <<
LG_PAGE));
arena_run_split(arena, run, size, large, binind, zero);
return (run);
}
return (NULL);
}
static arena_run_t *
arena_run_alloc(arena_t *arena, size_t size, bool large, size_t binind,
bool zero)
{
arena_chunk_t *chunk;
arena_run_t *run;
assert(size <= arena_maxclass);
assert((size & PAGE_MASK) == 0);
assert((large && binind == BININD_INVALID) || (large == false && binind
!= BININD_INVALID));
/* Search the arena's chunks for the lowest best fit. */
run = arena_run_alloc_helper(arena, size, large, binind, zero);
if (run != NULL)
return (run);
/*
* No usable runs. Create a new chunk from which to allocate the run.
*/
chunk = arena_chunk_alloc(arena);
if (chunk != NULL) {
run = (arena_run_t *)((uintptr_t)chunk + (map_bias << LG_PAGE));
arena_run_split(arena, run, size, large, binind, zero);
return (run);
}
/*
* arena_chunk_alloc() failed, but another thread may have made
* sufficient memory available while this one dropped arena->lock in
* arena_chunk_alloc(), so search one more time.
*/
return (arena_run_alloc_helper(arena, size, large, binind, zero));
}
static inline void
arena_maybe_purge(arena_t *arena)
{
size_t npurgeable, threshold;
/* Don't purge if the option is disabled. */
if (opt_lg_dirty_mult < 0)
return;
/* Don't purge if all dirty pages are already being purged. */
if (arena->ndirty <= arena->npurgatory)
return;
npurgeable = arena->ndirty - arena->npurgatory;
threshold = (arena->nactive >> opt_lg_dirty_mult);
/*
* Don't purge unless the number of purgeable pages exceeds the
* threshold.
*/
if (npurgeable <= threshold)
return;
arena_purge(arena, false);
}
static inline size_t
arena_chunk_purge(arena_t *arena, arena_chunk_t *chunk, bool all)
{
size_t npurged;
ql_head(arena_chunk_map_t) mapelms;
arena_chunk_map_t *mapelm;
size_t pageind, npages;
size_t nmadvise;
ql_new(&mapelms);
/*
* If chunk is the spare, temporarily re-allocate it, 1) so that its
* run is reinserted into runs_avail, and 2) so that it cannot be
* completely discarded by another thread while arena->lock is dropped
* by this thread. Note that the arena_run_dalloc() call will
* implicitly deallocate the chunk, so no explicit action is required
* in this function to deallocate the chunk.
*
* Note that once a chunk contains dirty pages, it cannot again contain
* a single run unless 1) it is a dirty run, or 2) this function purges
* dirty pages and causes the transition to a single clean run. Thus
* (chunk == arena->spare) is possible, but it is not possible for
* this function to be called on the spare unless it contains a dirty
* run.
*/
if (chunk == arena->spare) {
assert(arena_mapbits_dirty_get(chunk, map_bias) != 0);
assert(arena_mapbits_dirty_get(chunk, chunk_npages-1) != 0);
arena_chunk_alloc(arena);
}
if (config_stats)
arena->stats.purged += chunk->ndirty;
/*
* Operate on all dirty runs if there is no clean/dirty run
* fragmentation.
*/
if (chunk->nruns_adjac == 0)
all = true;
/*
* Temporarily allocate free dirty runs within chunk. If all is false,
* only operate on dirty runs that are fragments; otherwise operate on
* all dirty runs.
*/
for (pageind = map_bias; pageind < chunk_npages; pageind += npages) {
mapelm = arena_mapp_get(chunk, pageind);
if (arena_mapbits_allocated_get(chunk, pageind) == 0) {
size_t run_size =
arena_mapbits_unallocated_size_get(chunk, pageind);
npages = run_size >> LG_PAGE;
assert(pageind + npages <= chunk_npages);
assert(arena_mapbits_dirty_get(chunk, pageind) ==
arena_mapbits_dirty_get(chunk, pageind+npages-1));
if (arena_mapbits_dirty_get(chunk, pageind) != 0 &&
(all || arena_avail_adjac(chunk, pageind,
npages))) {
arena_run_t *run = (arena_run_t *)((uintptr_t)
chunk + (uintptr_t)(pageind << LG_PAGE));
arena_run_split(arena, run, run_size, true,
BININD_INVALID, false);
/* Append to list for later processing. */
ql_elm_new(mapelm, u.ql_link);
ql_tail_insert(&mapelms, mapelm, u.ql_link);
}
} else {
/* Skip run. */
if (arena_mapbits_large_get(chunk, pageind) != 0) {
npages = arena_mapbits_large_size_get(chunk,
pageind) >> LG_PAGE;
} else {
size_t binind;
arena_bin_info_t *bin_info;
arena_run_t *run = (arena_run_t *)((uintptr_t)
chunk + (uintptr_t)(pageind << LG_PAGE));
assert(arena_mapbits_small_runind_get(chunk,
pageind) == 0);
binind = arena_bin_index(arena, run->bin);
bin_info = &arena_bin_info[binind];
npages = bin_info->run_size >> LG_PAGE;
}
}
}
assert(pageind == chunk_npages);
assert(chunk->ndirty == 0 || all == false);
assert(chunk->nruns_adjac == 0);
malloc_mutex_unlock(&arena->lock);
if (config_stats)
nmadvise = 0;
npurged = 0;
ql_foreach(mapelm, &mapelms, u.ql_link) {
bool unzeroed;
size_t flag_unzeroed, i;
pageind = (((uintptr_t)mapelm - (uintptr_t)chunk->map) /
sizeof(arena_chunk_map_t)) + map_bias;
npages = arena_mapbits_large_size_get(chunk, pageind) >>
LG_PAGE;
assert(pageind + npages <= chunk_npages);
unzeroed = pages_purge((void *)((uintptr_t)chunk + (pageind <<
LG_PAGE)), (npages << LG_PAGE));
flag_unzeroed = unzeroed ? CHUNK_MAP_UNZEROED : 0;
/*
* Set the unzeroed flag for all pages, now that pages_purge()
* has returned whether the pages were zeroed as a side effect
* of purging. This chunk map modification is safe even though
* the arena mutex isn't currently owned by this thread,
* because the run is marked as allocated, thus protecting it
* from being modified by any other thread. As long as these
* writes don't perturb the first and last elements'
* CHUNK_MAP_ALLOCATED bits, behavior is well defined.
*/
for (i = 0; i < npages; i++) {
arena_mapbits_unzeroed_set(chunk, pageind+i,
flag_unzeroed);
}
npurged += npages;
if (config_stats)
nmadvise++;
}
malloc_mutex_lock(&arena->lock);
if (config_stats)
arena->stats.nmadvise += nmadvise;
/* Deallocate runs. */
for (mapelm = ql_first(&mapelms); mapelm != NULL;
mapelm = ql_first(&mapelms)) {
arena_run_t *run;
pageind = (((uintptr_t)mapelm - (uintptr_t)chunk->map) /
sizeof(arena_chunk_map_t)) + map_bias;
run = (arena_run_t *)((uintptr_t)chunk + (uintptr_t)(pageind <<
LG_PAGE));
ql_remove(&mapelms, mapelm, u.ql_link);
arena_run_dalloc(arena, run, false, true);
}
return (npurged);
}
static arena_chunk_t *
chunks_dirty_iter_cb(arena_chunk_tree_t *tree, arena_chunk_t *chunk, void *arg)
{
size_t *ndirty = (size_t *)arg;
assert(chunk->ndirty != 0);
*ndirty += chunk->ndirty;
return (NULL);
}
static void
arena_purge(arena_t *arena, bool all)
{
arena_chunk_t *chunk;
size_t npurgatory;
if (config_debug) {
size_t ndirty = 0;
arena_chunk_dirty_iter(&arena->chunks_dirty, NULL,
chunks_dirty_iter_cb, (void *)&ndirty);
assert(ndirty == arena->ndirty);
}
assert(arena->ndirty > arena->npurgatory || all);
assert((arena->nactive >> opt_lg_dirty_mult) < (arena->ndirty -
arena->npurgatory) || all);
if (config_stats)
arena->stats.npurge++;
/*
* Compute the minimum number of pages that this thread should try to
* purge, and add the result to arena->npurgatory. This will keep
* multiple threads from racing to reduce ndirty below the threshold.
*/
{
size_t npurgeable = arena->ndirty - arena->npurgatory;
if (all == false) {
size_t threshold = (arena->nactive >>
opt_lg_dirty_mult);
npurgatory = npurgeable - threshold;
} else
npurgatory = npurgeable;
}
arena->npurgatory += npurgatory;
while (npurgatory > 0) {
size_t npurgeable, npurged, nunpurged;
/* Get next chunk with dirty pages. */
chunk = arena_chunk_dirty_first(&arena->chunks_dirty);
if (chunk == NULL) {
/*
* This thread was unable to purge as many pages as
* originally intended, due to races with other threads
* that either did some of the purging work, or re-used
* dirty pages.
*/
arena->npurgatory -= npurgatory;
return;
}
npurgeable = chunk->ndirty;
assert(npurgeable != 0);
if (npurgeable > npurgatory && chunk->nruns_adjac == 0) {
/*
* This thread will purge all the dirty pages in chunk,
* so set npurgatory to reflect this thread's intent to
* purge the pages. This tends to reduce the chances
* of the following scenario:
*
* 1) This thread sets arena->npurgatory such that
* (arena->ndirty - arena->npurgatory) is at the
* threshold.
* 2) This thread drops arena->lock.
* 3) Another thread causes one or more pages to be
* dirtied, and immediately determines that it must
* purge dirty pages.
*
* If this scenario *does* play out, that's okay,
* because all of the purging work being done really
* needs to happen.
*/
arena->npurgatory += npurgeable - npurgatory;
npurgatory = npurgeable;
}
/*
* Keep track of how many pages are purgeable, versus how many
* actually get purged, and adjust counters accordingly.
*/
arena->npurgatory -= npurgeable;
npurgatory -= npurgeable;
npurged = arena_chunk_purge(arena, chunk, all);
nunpurged = npurgeable - npurged;
arena->npurgatory += nunpurged;
npurgatory += nunpurged;
}
}
void
arena_purge_all(arena_t *arena)
{
malloc_mutex_lock(&arena->lock);
arena_purge(arena, true);
malloc_mutex_unlock(&arena->lock);
}
static void
arena_run_dalloc(arena_t *arena, arena_run_t *run, bool dirty, bool cleaned)
{
arena_chunk_t *chunk;
size_t size, run_ind, run_pages, flag_dirty;
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run);
run_ind = (size_t)(((uintptr_t)run - (uintptr_t)chunk) >> LG_PAGE);
assert(run_ind >= map_bias);
assert(run_ind < chunk_npages);
if (arena_mapbits_large_get(chunk, run_ind) != 0) {
size = arena_mapbits_large_size_get(chunk, run_ind);
assert(size == PAGE ||
arena_mapbits_large_size_get(chunk,
run_ind+(size>>LG_PAGE)-1) == 0);
} else {
size_t binind = arena_bin_index(arena, run->bin);
arena_bin_info_t *bin_info = &arena_bin_info[binind];
size = bin_info->run_size;
}
run_pages = (size >> LG_PAGE);
if (config_stats) {
/*
* Update stats_cactive if nactive is crossing a chunk
* multiple.
*/
size_t cactive_diff = CHUNK_CEILING(arena->nactive << LG_PAGE) -
CHUNK_CEILING((arena->nactive - run_pages) << LG_PAGE);
if (cactive_diff != 0)
stats_cactive_sub(cactive_diff);
}
arena->nactive -= run_pages;
/*
* The run is dirty if the caller claims to have dirtied it, as well as
* if it was already dirty before being allocated and the caller
* doesn't claim to have cleaned it.
*/
assert(arena_mapbits_dirty_get(chunk, run_ind) ==
arena_mapbits_dirty_get(chunk, run_ind+run_pages-1));
if (cleaned == false && arena_mapbits_dirty_get(chunk, run_ind) != 0)
dirty = true;
flag_dirty = dirty ? CHUNK_MAP_DIRTY : 0;
/* Mark pages as unallocated in the chunk map. */
if (dirty) {
arena_mapbits_unallocated_set(chunk, run_ind, size,
CHUNK_MAP_DIRTY);
arena_mapbits_unallocated_set(chunk, run_ind+run_pages-1, size,
CHUNK_MAP_DIRTY);
} else {
arena_mapbits_unallocated_set(chunk, run_ind, size,
arena_mapbits_unzeroed_get(chunk, run_ind));
arena_mapbits_unallocated_set(chunk, run_ind+run_pages-1, size,
arena_mapbits_unzeroed_get(chunk, run_ind+run_pages-1));
}
/* Try to coalesce forward. */
if (run_ind + run_pages < chunk_npages &&
arena_mapbits_allocated_get(chunk, run_ind+run_pages) == 0 &&
arena_mapbits_dirty_get(chunk, run_ind+run_pages) == flag_dirty) {
size_t nrun_size = arena_mapbits_unallocated_size_get(chunk,
run_ind+run_pages);
size_t nrun_pages = nrun_size >> LG_PAGE;
/*
* Remove successor from runs_avail; the coalesced run is
* inserted later.
*/
assert(arena_mapbits_unallocated_size_get(chunk,
run_ind+run_pages+nrun_pages-1) == nrun_size);
assert(arena_mapbits_dirty_get(chunk,
run_ind+run_pages+nrun_pages-1) == flag_dirty);
arena_avail_remove(arena, chunk, run_ind+run_pages, nrun_pages,
false, true);
size += nrun_size;
run_pages += nrun_pages;
arena_mapbits_unallocated_size_set(chunk, run_ind, size);
arena_mapbits_unallocated_size_set(chunk, run_ind+run_pages-1,
size);
}
/* Try to coalesce backward. */
if (run_ind > map_bias && arena_mapbits_allocated_get(chunk, run_ind-1)
== 0 && arena_mapbits_dirty_get(chunk, run_ind-1) == flag_dirty) {
size_t prun_size = arena_mapbits_unallocated_size_get(chunk,
run_ind-1);
size_t prun_pages = prun_size >> LG_PAGE;
run_ind -= prun_pages;
/*
* Remove predecessor from runs_avail; the coalesced run is
* inserted later.
*/
assert(arena_mapbits_unallocated_size_get(chunk, run_ind) ==
prun_size);
assert(arena_mapbits_dirty_get(chunk, run_ind) == flag_dirty);
arena_avail_remove(arena, chunk, run_ind, prun_pages, true,
false);
size += prun_size;
run_pages += prun_pages;
arena_mapbits_unallocated_size_set(chunk, run_ind, size);
arena_mapbits_unallocated_size_set(chunk, run_ind+run_pages-1,
size);
}
/* Insert into runs_avail, now that coalescing is complete. */
assert(arena_mapbits_unallocated_size_get(chunk, run_ind) ==
arena_mapbits_unallocated_size_get(chunk, run_ind+run_pages-1));
assert(arena_mapbits_dirty_get(chunk, run_ind) ==
arena_mapbits_dirty_get(chunk, run_ind+run_pages-1));
arena_avail_insert(arena, chunk, run_ind, run_pages, true, true);
/* Deallocate chunk if it is now completely unused. */
if (size == arena_maxclass) {
assert(run_ind == map_bias);
assert(run_pages == (arena_maxclass >> LG_PAGE));
arena_chunk_dealloc(arena, chunk);
}
/*
* It is okay to do dirty page processing here even if the chunk was
* deallocated above, since in that case it is the spare. Waiting
* until after possible chunk deallocation to do dirty processing
* allows for an old spare to be fully deallocated, thus decreasing the
* chances of spuriously crossing the dirty page purging threshold.
*/
if (dirty)
arena_maybe_purge(arena);
}
static void
arena_run_trim_head(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run,
size_t oldsize, size_t newsize)
{
size_t pageind = ((uintptr_t)run - (uintptr_t)chunk) >> LG_PAGE;
size_t head_npages = (oldsize - newsize) >> LG_PAGE;
size_t flag_dirty = arena_mapbits_dirty_get(chunk, pageind);
assert(oldsize > newsize);
/*
* Update the chunk map so that arena_run_dalloc() can treat the
* leading run as separately allocated. Set the last element of each
* run first, in case of single-page runs.
*/
assert(arena_mapbits_large_size_get(chunk, pageind) == oldsize);
arena_mapbits_large_set(chunk, pageind+head_npages-1, 0, flag_dirty);
arena_mapbits_large_set(chunk, pageind, oldsize-newsize, flag_dirty);
if (config_debug) {
UNUSED size_t tail_npages = newsize >> LG_PAGE;
assert(arena_mapbits_large_size_get(chunk,
pageind+head_npages+tail_npages-1) == 0);
assert(arena_mapbits_dirty_get(chunk,
pageind+head_npages+tail_npages-1) == flag_dirty);
}
arena_mapbits_large_set(chunk, pageind+head_npages, newsize,
flag_dirty);
arena_run_dalloc(arena, run, false, false);
}
static void
arena_run_trim_tail(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run,
size_t oldsize, size_t newsize, bool dirty)
{
size_t pageind = ((uintptr_t)run - (uintptr_t)chunk) >> LG_PAGE;
size_t head_npages = newsize >> LG_PAGE;
size_t flag_dirty = arena_mapbits_dirty_get(chunk, pageind);
assert(oldsize > newsize);
/*
* Update the chunk map so that arena_run_dalloc() can treat the
* trailing run as separately allocated. Set the last element of each
* run first, in case of single-page runs.
*/
assert(arena_mapbits_large_size_get(chunk, pageind) == oldsize);
arena_mapbits_large_set(chunk, pageind+head_npages-1, 0, flag_dirty);
arena_mapbits_large_set(chunk, pageind, newsize, flag_dirty);
if (config_debug) {
UNUSED size_t tail_npages = (oldsize - newsize) >> LG_PAGE;
assert(arena_mapbits_large_size_get(chunk,
pageind+head_npages+tail_npages-1) == 0);
assert(arena_mapbits_dirty_get(chunk,
pageind+head_npages+tail_npages-1) == flag_dirty);
}
arena_mapbits_large_set(chunk, pageind+head_npages, oldsize-newsize,
flag_dirty);
arena_run_dalloc(arena, (arena_run_t *)((uintptr_t)run + newsize),
dirty, false);
}
static arena_run_t *
arena_bin_runs_first(arena_bin_t *bin)
{
arena_chunk_map_t *mapelm = arena_run_tree_first(&bin->runs);
if (mapelm != NULL) {
arena_chunk_t *chunk;
size_t pageind;
arena_run_t *run;
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(mapelm);
pageind = ((((uintptr_t)mapelm - (uintptr_t)chunk->map) /
sizeof(arena_chunk_map_t))) + map_bias;
run = (arena_run_t *)((uintptr_t)chunk + (uintptr_t)((pageind -
arena_mapbits_small_runind_get(chunk, pageind)) <<
LG_PAGE));
return (run);
}
return (NULL);
}
static void
arena_bin_runs_insert(arena_bin_t *bin, arena_run_t *run)
{
arena_chunk_t *chunk = CHUNK_ADDR2BASE(run);
size_t pageind = ((uintptr_t)run - (uintptr_t)chunk) >> LG_PAGE;
arena_chunk_map_t *mapelm = arena_mapp_get(chunk, pageind);
assert(arena_run_tree_search(&bin->runs, mapelm) == NULL);
arena_run_tree_insert(&bin->runs, mapelm);
}
static void
arena_bin_runs_remove(arena_bin_t *bin, arena_run_t *run)
{
arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run);
size_t pageind = ((uintptr_t)run - (uintptr_t)chunk) >> LG_PAGE;
arena_chunk_map_t *mapelm = arena_mapp_get(chunk, pageind);
assert(arena_run_tree_search(&bin->runs, mapelm) != NULL);
arena_run_tree_remove(&bin->runs, mapelm);
}
static arena_run_t *
arena_bin_nonfull_run_tryget(arena_bin_t *bin)
{
arena_run_t *run = arena_bin_runs_first(bin);
if (run != NULL) {
arena_bin_runs_remove(bin, run);
if (config_stats)
bin->stats.reruns++;
}
return (run);
}
static arena_run_t *
arena_bin_nonfull_run_get(arena_t *arena, arena_bin_t *bin)
{
arena_run_t *run;
size_t binind;
arena_bin_info_t *bin_info;
/* Look for a usable run. */
run = arena_bin_nonfull_run_tryget(bin);
if (run != NULL)
return (run);
/* No existing runs have any space available. */
binind = arena_bin_index(arena, bin);
bin_info = &arena_bin_info[binind];
/* Allocate a new run. */
malloc_mutex_unlock(&bin->lock);
/******************************/
malloc_mutex_lock(&arena->lock);
run = arena_run_alloc(arena, bin_info->run_size, false, binind, false);
if (run != NULL) {
bitmap_t *bitmap = (bitmap_t *)((uintptr_t)run +
(uintptr_t)bin_info->bitmap_offset);
/* Initialize run internals. */
VALGRIND_MAKE_MEM_UNDEFINED(run, bin_info->reg0_offset -
bin_info->redzone_size);
run->bin = bin;
run->nextind = 0;
run->nfree = bin_info->nregs;
bitmap_init(bitmap, &bin_info->bitmap_info);
}
malloc_mutex_unlock(&arena->lock);
/********************************/
malloc_mutex_lock(&bin->lock);
if (run != NULL) {
if (config_stats) {
bin->stats.nruns++;
bin->stats.curruns++;
}
return (run);
}
/*
* arena_run_alloc() failed, but another thread may have made
* sufficient memory available while this one dropped bin->lock above,
* so search one more time.
*/
run = arena_bin_nonfull_run_tryget(bin);
if (run != NULL)
return (run);
return (NULL);
}
/* Re-fill bin->runcur, then call arena_run_reg_alloc(). */
static void *
arena_bin_malloc_hard(arena_t *arena, arena_bin_t *bin)
{
void *ret;
size_t binind;
arena_bin_info_t *bin_info;
arena_run_t *run;
binind = arena_bin_index(arena, bin);
bin_info = &arena_bin_info[binind];
bin->runcur = NULL;
run = arena_bin_nonfull_run_get(arena, bin);
if (bin->runcur != NULL && bin->runcur->nfree > 0) {
/*
* Another thread updated runcur while this one ran without the
* bin lock in arena_bin_nonfull_run_get().
*/
assert(bin->runcur->nfree > 0);
ret = arena_run_reg_alloc(bin->runcur, bin_info);
if (run != NULL) {
arena_chunk_t *chunk;
/*
* arena_run_alloc() may have allocated run, or it may
* have pulled run from the bin's run tree. Therefore
* it is unsafe to make any assumptions about how run
* has previously been used, and arena_bin_lower_run()
* must be called, as if a region were just deallocated
* from the run.
*/
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run);
if (run->nfree == bin_info->nregs)
arena_dalloc_bin_run(arena, chunk, run, bin);
else
arena_bin_lower_run(arena, chunk, run, bin);
}
return (ret);
}
if (run == NULL)
return (NULL);
bin->runcur = run;
assert(bin->runcur->nfree > 0);
return (arena_run_reg_alloc(bin->runcur, bin_info));
}
void
arena_tcache_fill_small(arena_t *arena, tcache_bin_t *tbin, size_t binind,
uint64_t prof_accumbytes)
{
unsigned i, nfill;
arena_bin_t *bin;
arena_run_t *run;
void *ptr;
assert(tbin->ncached == 0);
if (config_prof)
arena_prof_accum(arena, prof_accumbytes);
bin = &arena->bins[binind];
malloc_mutex_lock(&bin->lock);
for (i = 0, nfill = (tcache_bin_info[binind].ncached_max >>
tbin->lg_fill_div); i < nfill; i++) {
if ((run = bin->runcur) != NULL && run->nfree > 0)
ptr = arena_run_reg_alloc(run, &arena_bin_info[binind]);
else
ptr = arena_bin_malloc_hard(arena, bin);
if (ptr == NULL)
break;
if (config_fill && opt_junk) {
arena_alloc_junk_small(ptr, &arena_bin_info[binind],
true);
}
/* Insert such that low regions get used first. */
tbin->avail[nfill - 1 - i] = ptr;
}
if (config_stats) {
bin->stats.allocated += i * arena_bin_info[binind].reg_size;
bin->stats.nmalloc += i;
bin->stats.nrequests += tbin->tstats.nrequests;
bin->stats.nfills++;
tbin->tstats.nrequests = 0;
}
malloc_mutex_unlock(&bin->lock);
tbin->ncached = i;
}
void
arena_alloc_junk_small(void *ptr, arena_bin_info_t *bin_info, bool zero)
{
if (zero) {
size_t redzone_size = bin_info->redzone_size;
memset((void *)((uintptr_t)ptr - redzone_size), 0xa5,
redzone_size);
memset((void *)((uintptr_t)ptr + bin_info->reg_size), 0xa5,
redzone_size);
} else {
memset((void *)((uintptr_t)ptr - bin_info->redzone_size), 0xa5,
bin_info->reg_interval);
}
}
void
arena_dalloc_junk_small(void *ptr, arena_bin_info_t *bin_info)
{
size_t size = bin_info->reg_size;
size_t redzone_size = bin_info->redzone_size;
size_t i;
bool error = false;
for (i = 1; i <= redzone_size; i++) {
unsigned byte;
if ((byte = *(uint8_t *)((uintptr_t)ptr - i)) != 0xa5) {
error = true;
malloc_printf("<jemalloc>: Corrupt redzone "
"%zu byte%s before %p (size %zu), byte=%#x\n", i,
(i == 1) ? "" : "s", ptr, size, byte);
}
}
for (i = 0; i < redzone_size; i++) {
unsigned byte;
if ((byte = *(uint8_t *)((uintptr_t)ptr + size + i)) != 0xa5) {
error = true;
malloc_printf("<jemalloc>: Corrupt redzone "
"%zu byte%s after end of %p (size %zu), byte=%#x\n",
i, (i == 1) ? "" : "s", ptr, size, byte);
}
}
if (opt_abort && error)
abort();
memset((void *)((uintptr_t)ptr - redzone_size), 0x5a,
bin_info->reg_interval);
}
void *
arena_malloc_small(arena_t *arena, size_t size, bool zero)
{
void *ret;
arena_bin_t *bin;
arena_run_t *run;
size_t binind;
binind = SMALL_SIZE2BIN(size);
assert(binind < NBINS);
bin = &arena->bins[binind];
size = arena_bin_info[binind].reg_size;
malloc_mutex_lock(&bin->lock);
if ((run = bin->runcur) != NULL && run->nfree > 0)
ret = arena_run_reg_alloc(run, &arena_bin_info[binind]);
else
ret = arena_bin_malloc_hard(arena, bin);
if (ret == NULL) {
malloc_mutex_unlock(&bin->lock);
return (NULL);
}
if (config_stats) {
bin->stats.allocated += size;
bin->stats.nmalloc++;
bin->stats.nrequests++;
}
malloc_mutex_unlock(&bin->lock);
if (config_prof && isthreaded == false)
arena_prof_accum(arena, size);
if (zero == false) {
if (config_fill) {
if (opt_junk) {
arena_alloc_junk_small(ret,
&arena_bin_info[binind], false);
} else if (opt_zero)
memset(ret, 0, size);
}
} else {
if (config_fill && opt_junk) {
arena_alloc_junk_small(ret, &arena_bin_info[binind],
true);
}
VALGRIND_MAKE_MEM_UNDEFINED(ret, size);
memset(ret, 0, size);
}
return (ret);
}
void *
arena_malloc_large(arena_t *arena, size_t size, bool zero)
{
void *ret;
/* Large allocation. */
size = PAGE_CEILING(size);
malloc_mutex_lock(&arena->lock);
ret = (void *)arena_run_alloc(arena, size, true, BININD_INVALID, zero);
if (ret == NULL) {
malloc_mutex_unlock(&arena->lock);
return (NULL);
}
if (config_stats) {
arena->stats.nmalloc_large++;
arena->stats.nrequests_large++;
arena->stats.allocated_large += size;
arena->stats.lstats[(size >> LG_PAGE) - 1].nmalloc++;
arena->stats.lstats[(size >> LG_PAGE) - 1].nrequests++;
arena->stats.lstats[(size >> LG_PAGE) - 1].curruns++;
}
if (config_prof)
arena_prof_accum_locked(arena, size);
malloc_mutex_unlock(&arena->lock);
if (zero == false) {
if (config_fill) {
if (opt_junk)
memset(ret, 0xa5, size);
else if (opt_zero)
memset(ret, 0, size);
}
}
return (ret);
}
/* Only handles large allocations that require more than page alignment. */
void *
arena_palloc(arena_t *arena, size_t size, size_t alignment, bool zero)
{
void *ret;
size_t alloc_size, leadsize, trailsize;
arena_run_t *run;
arena_chunk_t *chunk;
assert((size & PAGE_MASK) == 0);
alignment = PAGE_CEILING(alignment);
alloc_size = size + alignment - PAGE;
malloc_mutex_lock(&arena->lock);
run = arena_run_alloc(arena, alloc_size, true, BININD_INVALID, zero);
if (run == NULL) {
malloc_mutex_unlock(&arena->lock);
return (NULL);
}
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run);
leadsize = ALIGNMENT_CEILING((uintptr_t)run, alignment) -
(uintptr_t)run;
assert(alloc_size >= leadsize + size);
trailsize = alloc_size - leadsize - size;
ret = (void *)((uintptr_t)run + leadsize);
if (leadsize != 0) {
arena_run_trim_head(arena, chunk, run, alloc_size, alloc_size -
leadsize);
}
if (trailsize != 0) {
arena_run_trim_tail(arena, chunk, ret, size + trailsize, size,
false);
}
if (config_stats) {
arena->stats.nmalloc_large++;
arena->stats.nrequests_large++;
arena->stats.allocated_large += size;
arena->stats.lstats[(size >> LG_PAGE) - 1].nmalloc++;
arena->stats.lstats[(size >> LG_PAGE) - 1].nrequests++;
arena->stats.lstats[(size >> LG_PAGE) - 1].curruns++;
}
malloc_mutex_unlock(&arena->lock);
if (config_fill && zero == false) {
if (opt_junk)
memset(ret, 0xa5, size);
else if (opt_zero)
memset(ret, 0, size);
}
return (ret);
}
void
arena_prof_promoted(const void *ptr, size_t size)
{
arena_chunk_t *chunk;
size_t pageind, binind;
cassert(config_prof);
assert(ptr != NULL);
assert(CHUNK_ADDR2BASE(ptr) != ptr);
assert(isalloc(ptr, false) == PAGE);
assert(isalloc(ptr, true) == PAGE);
assert(size <= SMALL_MAXCLASS);
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
binind = SMALL_SIZE2BIN(size);
assert(binind < NBINS);
arena_mapbits_large_binind_set(chunk, pageind, binind);
assert(isalloc(ptr, false) == PAGE);
assert(isalloc(ptr, true) == size);
}
static void
arena_dissociate_bin_run(arena_chunk_t *chunk, arena_run_t *run,
arena_bin_t *bin)
{
/* Dissociate run from bin. */
if (run == bin->runcur)
bin->runcur = NULL;
else {
size_t binind = arena_bin_index(chunk->arena, bin);
arena_bin_info_t *bin_info = &arena_bin_info[binind];
if (bin_info->nregs != 1) {
/*
* This block's conditional is necessary because if the
* run only contains one region, then it never gets
* inserted into the non-full runs tree.
*/
arena_bin_runs_remove(bin, run);
}
}
}
static void
arena_dalloc_bin_run(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run,
arena_bin_t *bin)
{
size_t binind;
arena_bin_info_t *bin_info;
size_t npages, run_ind, past;
assert(run != bin->runcur);
assert(arena_run_tree_search(&bin->runs,
arena_mapp_get(chunk, ((uintptr_t)run-(uintptr_t)chunk)>>LG_PAGE))
== NULL);
binind = arena_bin_index(chunk->arena, run->bin);
bin_info = &arena_bin_info[binind];
malloc_mutex_unlock(&bin->lock);
/******************************/
npages = bin_info->run_size >> LG_PAGE;
run_ind = (size_t)(((uintptr_t)run - (uintptr_t)chunk) >> LG_PAGE);
past = (size_t)(PAGE_CEILING((uintptr_t)run +
(uintptr_t)bin_info->reg0_offset + (uintptr_t)(run->nextind *
bin_info->reg_interval - bin_info->redzone_size) -
(uintptr_t)chunk) >> LG_PAGE);
malloc_mutex_lock(&arena->lock);
/*
* If the run was originally clean, and some pages were never touched,
* trim the clean pages before deallocating the dirty portion of the
* run.
*/
assert(arena_mapbits_dirty_get(chunk, run_ind) ==
arena_mapbits_dirty_get(chunk, run_ind+npages-1));
if (arena_mapbits_dirty_get(chunk, run_ind) == 0 && past - run_ind <
npages) {
/* Trim clean pages. Convert to large run beforehand. */
assert(npages > 0);
arena_mapbits_large_set(chunk, run_ind, bin_info->run_size, 0);
arena_mapbits_large_set(chunk, run_ind+npages-1, 0, 0);
arena_run_trim_tail(arena, chunk, run, (npages << LG_PAGE),
((past - run_ind) << LG_PAGE), false);
/* npages = past - run_ind; */
}
arena_run_dalloc(arena, run, true, false);
malloc_mutex_unlock(&arena->lock);
/****************************/
malloc_mutex_lock(&bin->lock);
if (config_stats)
bin->stats.curruns--;
}
static void
arena_bin_lower_run(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run,
arena_bin_t *bin)
{
/*
* Make sure that if bin->runcur is non-NULL, it refers to the lowest
* non-full run. It is okay to NULL runcur out rather than proactively
* keeping it pointing at the lowest non-full run.
*/
if ((uintptr_t)run < (uintptr_t)bin->runcur) {
/* Switch runcur. */
if (bin->runcur->nfree > 0)
arena_bin_runs_insert(bin, bin->runcur);
bin->runcur = run;
if (config_stats)
bin->stats.reruns++;
} else
arena_bin_runs_insert(bin, run);
}
void
arena_dalloc_bin_locked(arena_t *arena, arena_chunk_t *chunk, void *ptr,
arena_chunk_map_t *mapelm)
{
size_t pageind;
arena_run_t *run;
arena_bin_t *bin;
arena_bin_info_t *bin_info;
size_t size, binind;
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
run = (arena_run_t *)((uintptr_t)chunk + (uintptr_t)((pageind -
arena_mapbits_small_runind_get(chunk, pageind)) << LG_PAGE));
bin = run->bin;
binind = arena_ptr_small_binind_get(ptr, mapelm->bits);
bin_info = &arena_bin_info[binind];
if (config_fill || config_stats)
size = bin_info->reg_size;
if (config_fill && opt_junk)
arena_dalloc_junk_small(ptr, bin_info);
arena_run_reg_dalloc(run, ptr);
if (run->nfree == bin_info->nregs) {
arena_dissociate_bin_run(chunk, run, bin);
arena_dalloc_bin_run(arena, chunk, run, bin);
} else if (run->nfree == 1 && run != bin->runcur)
arena_bin_lower_run(arena, chunk, run, bin);
if (config_stats) {
bin->stats.allocated -= size;
bin->stats.ndalloc++;
}
}
void
arena_dalloc_bin(arena_t *arena, arena_chunk_t *chunk, void *ptr,
size_t pageind, arena_chunk_map_t *mapelm)
{
arena_run_t *run;
arena_bin_t *bin;
run = (arena_run_t *)((uintptr_t)chunk + (uintptr_t)((pageind -
arena_mapbits_small_runind_get(chunk, pageind)) << LG_PAGE));
bin = run->bin;
malloc_mutex_lock(&bin->lock);
arena_dalloc_bin_locked(arena, chunk, ptr, mapelm);
malloc_mutex_unlock(&bin->lock);
}
void
arena_dalloc_small(arena_t *arena, arena_chunk_t *chunk, void *ptr,
size_t pageind)
{
arena_chunk_map_t *mapelm;
if (config_debug) {
/* arena_ptr_small_binind_get() does extra sanity checking. */
assert(arena_ptr_small_binind_get(ptr, arena_mapbits_get(chunk,
pageind)) != BININD_INVALID);
}
mapelm = arena_mapp_get(chunk, pageind);
arena_dalloc_bin(arena, chunk, ptr, pageind, mapelm);
}
void
arena_dalloc_large_locked(arena_t *arena, arena_chunk_t *chunk, void *ptr)
{
if (config_fill || config_stats) {
size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
size_t size = arena_mapbits_large_size_get(chunk, pageind);
if (config_fill && config_stats && opt_junk)
memset(ptr, 0x5a, size);
if (config_stats) {
arena->stats.ndalloc_large++;
arena->stats.allocated_large -= size;
arena->stats.lstats[(size >> LG_PAGE) - 1].ndalloc++;
arena->stats.lstats[(size >> LG_PAGE) - 1].curruns--;
}
}
arena_run_dalloc(arena, (arena_run_t *)ptr, true, false);
}
void
arena_dalloc_large(arena_t *arena, arena_chunk_t *chunk, void *ptr)
{
malloc_mutex_lock(&arena->lock);
arena_dalloc_large_locked(arena, chunk, ptr);
malloc_mutex_unlock(&arena->lock);
}
static void
arena_ralloc_large_shrink(arena_t *arena, arena_chunk_t *chunk, void *ptr,
size_t oldsize, size_t size)
{
assert(size < oldsize);
/*
* Shrink the run, and make trailing pages available for other
* allocations.
*/
malloc_mutex_lock(&arena->lock);
arena_run_trim_tail(arena, chunk, (arena_run_t *)ptr, oldsize, size,
true);
if (config_stats) {
arena->stats.ndalloc_large++;
arena->stats.allocated_large -= oldsize;
arena->stats.lstats[(oldsize >> LG_PAGE) - 1].ndalloc++;
arena->stats.lstats[(oldsize >> LG_PAGE) - 1].curruns--;
arena->stats.nmalloc_large++;
arena->stats.nrequests_large++;
arena->stats.allocated_large += size;
arena->stats.lstats[(size >> LG_PAGE) - 1].nmalloc++;
arena->stats.lstats[(size >> LG_PAGE) - 1].nrequests++;
arena->stats.lstats[(size >> LG_PAGE) - 1].curruns++;
}
malloc_mutex_unlock(&arena->lock);
}
static bool
arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk, void *ptr,
size_t oldsize, size_t size, size_t extra, bool zero)
{
size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
size_t npages = oldsize >> LG_PAGE;
size_t followsize;
assert(oldsize == arena_mapbits_large_size_get(chunk, pageind));
/* Try to extend the run. */
assert(size + extra > oldsize);
malloc_mutex_lock(&arena->lock);
if (pageind + npages < chunk_npages &&
arena_mapbits_allocated_get(chunk, pageind+npages) == 0 &&
(followsize = arena_mapbits_unallocated_size_get(chunk,
pageind+npages)) >= size - oldsize) {
/*
* The next run is available and sufficiently large. Split the
* following run, then merge the first part with the existing
* allocation.
*/
size_t flag_dirty;
size_t splitsize = (oldsize + followsize <= size + extra)
? followsize : size + extra - oldsize;
arena_run_split(arena, (arena_run_t *)((uintptr_t)chunk +
((pageind+npages) << LG_PAGE)), splitsize, true,
BININD_INVALID, zero);
size = oldsize + splitsize;
npages = size >> LG_PAGE;
/*
* Mark the extended run as dirty if either portion of the run
* was dirty before allocation. This is rather pedantic,
* because there's not actually any sequence of events that
* could cause the resulting run to be passed to
* arena_run_dalloc() with the dirty argument set to false
* (which is when dirty flag consistency would really matter).
*/
flag_dirty = arena_mapbits_dirty_get(chunk, pageind) |
arena_mapbits_dirty_get(chunk, pageind+npages-1);
arena_mapbits_large_set(chunk, pageind, size, flag_dirty);
arena_mapbits_large_set(chunk, pageind+npages-1, 0, flag_dirty);
if (config_stats) {
arena->stats.ndalloc_large++;
arena->stats.allocated_large -= oldsize;
arena->stats.lstats[(oldsize >> LG_PAGE) - 1].ndalloc++;
arena->stats.lstats[(oldsize >> LG_PAGE) - 1].curruns--;
arena->stats.nmalloc_large++;
arena->stats.nrequests_large++;
arena->stats.allocated_large += size;
arena->stats.lstats[(size >> LG_PAGE) - 1].nmalloc++;
arena->stats.lstats[(size >> LG_PAGE) - 1].nrequests++;
arena->stats.lstats[(size >> LG_PAGE) - 1].curruns++;
}
malloc_mutex_unlock(&arena->lock);
return (false);
}
malloc_mutex_unlock(&arena->lock);
return (true);
}
/*
* Try to resize a large allocation, in order to avoid copying. This will
* always fail if growing an object, and the following run is already in use.
*/
static bool
arena_ralloc_large(void *ptr, size_t oldsize, size_t size, size_t extra,
bool zero)
{
size_t psize;
psize = PAGE_CEILING(size + extra);
if (psize == oldsize) {
/* Same size class. */
if (config_fill && opt_junk && size < oldsize) {
memset((void *)((uintptr_t)ptr + size), 0x5a, oldsize -
size);
}
return (false);
} else {
arena_chunk_t *chunk;
arena_t *arena;
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
arena = chunk->arena;
if (psize < oldsize) {
/* Fill before shrinking in order avoid a race. */
if (config_fill && opt_junk) {
memset((void *)((uintptr_t)ptr + size), 0x5a,
oldsize - size);
}
arena_ralloc_large_shrink(arena, chunk, ptr, oldsize,
psize);
return (false);
} else {
bool ret = arena_ralloc_large_grow(arena, chunk, ptr,
oldsize, PAGE_CEILING(size),
psize - PAGE_CEILING(size), zero);
if (config_fill && ret == false && zero == false &&
opt_zero) {
memset((void *)((uintptr_t)ptr + oldsize), 0,
size - oldsize);
}
return (ret);
}
}
}
void *
arena_ralloc_no_move(void *ptr, size_t oldsize, size_t size, size_t extra,
bool zero)
{
/*
* Avoid moving the allocation if the size class can be left the same.
*/
if (oldsize <= arena_maxclass) {
if (oldsize <= SMALL_MAXCLASS) {
assert(arena_bin_info[SMALL_SIZE2BIN(oldsize)].reg_size
== oldsize);
if ((size + extra <= SMALL_MAXCLASS &&
SMALL_SIZE2BIN(size + extra) ==
SMALL_SIZE2BIN(oldsize)) || (size <= oldsize &&
size + extra >= oldsize)) {
if (config_fill && opt_junk && size < oldsize) {
memset((void *)((uintptr_t)ptr + size),
0x5a, oldsize - size);
}
return (ptr);
}
} else {
assert(size <= arena_maxclass);
if (size + extra > SMALL_MAXCLASS) {
if (arena_ralloc_large(ptr, oldsize, size,
extra, zero) == false)
return (ptr);
}
}
}
/* Reallocation would require a move. */
return (NULL);
}
void *
arena_ralloc(arena_t *arena, void *ptr, size_t oldsize, size_t size,
size_t extra, size_t alignment, bool zero, bool try_tcache_alloc,
bool try_tcache_dalloc)
{
void *ret;
size_t copysize;
/* Try to avoid moving the allocation. */
ret = arena_ralloc_no_move(ptr, oldsize, size, extra, zero);
if (ret != NULL)
return (ret);
/*
* size and oldsize are different enough that we need to move the
* object. In that case, fall back to allocating new space and
* copying.
*/
if (alignment != 0) {
size_t usize = sa2u(size + extra, alignment);
if (usize == 0)
return (NULL);
ret = ipallocx(usize, alignment, zero, try_tcache_alloc, arena);
} else
ret = arena_malloc(arena, size + extra, zero, try_tcache_alloc);
if (ret == NULL) {
if (extra == 0)
return (NULL);
/* Try again, this time without extra. */
if (alignment != 0) {
size_t usize = sa2u(size, alignment);
if (usize == 0)
return (NULL);
ret = ipallocx(usize, alignment, zero, try_tcache_alloc,
arena);
} else
ret = arena_malloc(arena, size, zero, try_tcache_alloc);
if (ret == NULL)
return (NULL);
}
/* Junk/zero-filling were already done by ipalloc()/arena_malloc(). */
/*
* Copy at most size bytes (not size+extra), since the caller has no
* expectation that the extra bytes will be reliably preserved.
*/
copysize = (size < oldsize) ? size : oldsize;
VALGRIND_MAKE_MEM_UNDEFINED(ret, copysize);
memcpy(ret, ptr, copysize);
iqallocx(ptr, try_tcache_dalloc);
return (ret);
}
dss_prec_t
arena_dss_prec_get(arena_t *arena)
{
dss_prec_t ret;
malloc_mutex_lock(&arena->lock);
ret = arena->dss_prec;
malloc_mutex_unlock(&arena->lock);
return (ret);
}
void
arena_dss_prec_set(arena_t *arena, dss_prec_t dss_prec)
{
malloc_mutex_lock(&arena->lock);
arena->dss_prec = dss_prec;
malloc_mutex_unlock(&arena->lock);
}
void
arena_stats_merge(arena_t *arena, const char **dss, size_t *nactive,
size_t *ndirty, arena_stats_t *astats, malloc_bin_stats_t *bstats,
malloc_large_stats_t *lstats)
{
unsigned i;
malloc_mutex_lock(&arena->lock);
*dss = dss_prec_names[arena->dss_prec];
*nactive += arena->nactive;
*ndirty += arena->ndirty;
astats->mapped += arena->stats.mapped;
astats->npurge += arena->stats.npurge;
astats->nmadvise += arena->stats.nmadvise;
astats->purged += arena->stats.purged;
astats->allocated_large += arena->stats.allocated_large;
astats->nmalloc_large += arena->stats.nmalloc_large;
astats->ndalloc_large += arena->stats.ndalloc_large;
astats->nrequests_large += arena->stats.nrequests_large;
for (i = 0; i < nlclasses; i++) {
lstats[i].nmalloc += arena->stats.lstats[i].nmalloc;
lstats[i].ndalloc += arena->stats.lstats[i].ndalloc;
lstats[i].nrequests += arena->stats.lstats[i].nrequests;
lstats[i].curruns += arena->stats.lstats[i].curruns;
}
malloc_mutex_unlock(&arena->lock);
for (i = 0; i < NBINS; i++) {
arena_bin_t *bin = &arena->bins[i];
malloc_mutex_lock(&bin->lock);
bstats[i].allocated += bin->stats.allocated;
bstats[i].nmalloc += bin->stats.nmalloc;
bstats[i].ndalloc += bin->stats.ndalloc;
bstats[i].nrequests += bin->stats.nrequests;
if (config_tcache) {
bstats[i].nfills += bin->stats.nfills;
bstats[i].nflushes += bin->stats.nflushes;
}
bstats[i].nruns += bin->stats.nruns;
bstats[i].reruns += bin->stats.reruns;
bstats[i].curruns += bin->stats.curruns;
malloc_mutex_unlock(&bin->lock);
}
}
bool
arena_new(arena_t *arena, unsigned ind)
{
unsigned i;
arena_bin_t *bin;
arena->ind = ind;
arena->nthreads = 0;
if (malloc_mutex_init(&arena->lock))
return (true);
if (config_stats) {
memset(&arena->stats, 0, sizeof(arena_stats_t));
arena->stats.lstats =
(malloc_large_stats_t *)base_alloc(nlclasses *
sizeof(malloc_large_stats_t));
if (arena->stats.lstats == NULL)
return (true);
memset(arena->stats.lstats, 0, nlclasses *
sizeof(malloc_large_stats_t));
if (config_tcache)
ql_new(&arena->tcache_ql);
}
if (config_prof)
arena->prof_accumbytes = 0;
arena->dss_prec = chunk_dss_prec_get();
/* Initialize chunks. */
arena_chunk_dirty_new(&arena->chunks_dirty);
arena->spare = NULL;
arena->nactive = 0;
arena->ndirty = 0;
arena->npurgatory = 0;
arena_avail_tree_new(&arena->runs_avail);
/* Initialize bins. */
for (i = 0; i < NBINS; i++) {
bin = &arena->bins[i];
if (malloc_mutex_init(&bin->lock))
return (true);
bin->runcur = NULL;
arena_run_tree_new(&bin->runs);
if (config_stats)
memset(&bin->stats, 0, sizeof(malloc_bin_stats_t));
}
return (false);
}
/*
* Calculate bin_info->run_size such that it meets the following constraints:
*
* *) bin_info->run_size >= min_run_size
* *) bin_info->run_size <= arena_maxclass
* *) run header overhead <= RUN_MAX_OVRHD (or header overhead relaxed).
* *) bin_info->nregs <= RUN_MAXREGS
*
* bin_info->nregs, bin_info->bitmap_offset, and bin_info->reg0_offset are also
* calculated here, since these settings are all interdependent.
*/
static size_t
bin_info_run_size_calc(arena_bin_info_t *bin_info, size_t min_run_size)
{
size_t pad_size;
size_t try_run_size, good_run_size;
uint32_t try_nregs, good_nregs;
uint32_t try_hdr_size, good_hdr_size;
uint32_t try_bitmap_offset, good_bitmap_offset;
uint32_t try_ctx0_offset, good_ctx0_offset;
uint32_t try_redzone0_offset, good_redzone0_offset;
assert(min_run_size >= PAGE);
assert(min_run_size <= arena_maxclass);
/*
* Determine redzone size based on minimum alignment and minimum
* redzone size. Add padding to the end of the run if it is needed to
* align the regions. The padding allows each redzone to be half the
* minimum alignment; without the padding, each redzone would have to
* be twice as large in order to maintain alignment.
*/
if (config_fill && opt_redzone) {
size_t align_min = ZU(1) << (ffs(bin_info->reg_size) - 1);
if (align_min <= REDZONE_MINSIZE) {
bin_info->redzone_size = REDZONE_MINSIZE;
pad_size = 0;
} else {
bin_info->redzone_size = align_min >> 1;
pad_size = bin_info->redzone_size;
}
} else {
bin_info->redzone_size = 0;
pad_size = 0;
}
bin_info->reg_interval = bin_info->reg_size +
(bin_info->redzone_size << 1);
/*
* Calculate known-valid settings before entering the run_size
* expansion loop, so that the first part of the loop always copies
* valid settings.
*
* The do..while loop iteratively reduces the number of regions until
* the run header and the regions no longer overlap. A closed formula
* would be quite messy, since there is an interdependency between the
* header's mask length and the number of regions.
*/
try_run_size = min_run_size;
try_nregs = ((try_run_size - sizeof(arena_run_t)) /
bin_info->reg_interval)
+ 1; /* Counter-act try_nregs-- in loop. */
if (try_nregs > RUN_MAXREGS) {
try_nregs = RUN_MAXREGS
+ 1; /* Counter-act try_nregs-- in loop. */
}
do {
try_nregs--;
try_hdr_size = sizeof(arena_run_t);
/* Pad to a long boundary. */
try_hdr_size = LONG_CEILING(try_hdr_size);
try_bitmap_offset = try_hdr_size;
/* Add space for bitmap. */
try_hdr_size += bitmap_size(try_nregs);
if (config_prof && opt_prof && prof_promote == false) {
/* Pad to a quantum boundary. */
try_hdr_size = QUANTUM_CEILING(try_hdr_size);
try_ctx0_offset = try_hdr_size;
/* Add space for one (prof_ctx_t *) per region. */
try_hdr_size += try_nregs * sizeof(prof_ctx_t *);
} else
try_ctx0_offset = 0;
try_redzone0_offset = try_run_size - (try_nregs *
bin_info->reg_interval) - pad_size;
} while (try_hdr_size > try_redzone0_offset);
/* run_size expansion loop. */
do {
/*
* Copy valid settings before trying more aggressive settings.
*/
good_run_size = try_run_size;
good_nregs = try_nregs;
good_hdr_size = try_hdr_size;
good_bitmap_offset = try_bitmap_offset;
good_ctx0_offset = try_ctx0_offset;
good_redzone0_offset = try_redzone0_offset;
/* Try more aggressive settings. */
try_run_size += PAGE;
try_nregs = ((try_run_size - sizeof(arena_run_t) - pad_size) /
bin_info->reg_interval)
+ 1; /* Counter-act try_nregs-- in loop. */
if (try_nregs > RUN_MAXREGS) {
try_nregs = RUN_MAXREGS
+ 1; /* Counter-act try_nregs-- in loop. */
}
do {
try_nregs--;
try_hdr_size = sizeof(arena_run_t);
/* Pad to a long boundary. */
try_hdr_size = LONG_CEILING(try_hdr_size);
try_bitmap_offset = try_hdr_size;
/* Add space for bitmap. */
try_hdr_size += bitmap_size(try_nregs);
if (config_prof && opt_prof && prof_promote == false) {
/* Pad to a quantum boundary. */
try_hdr_size = QUANTUM_CEILING(try_hdr_size);
try_ctx0_offset = try_hdr_size;
/*
* Add space for one (prof_ctx_t *) per region.
*/
try_hdr_size += try_nregs *
sizeof(prof_ctx_t *);
}
try_redzone0_offset = try_run_size - (try_nregs *
bin_info->reg_interval) - pad_size;
} while (try_hdr_size > try_redzone0_offset);
} while (try_run_size <= arena_maxclass
&& try_run_size <= arena_maxclass
&& RUN_MAX_OVRHD * (bin_info->reg_interval << 3) >
RUN_MAX_OVRHD_RELAX
&& (try_redzone0_offset << RUN_BFP) > RUN_MAX_OVRHD * try_run_size
&& try_nregs < RUN_MAXREGS);
assert(good_hdr_size <= good_redzone0_offset);
/* Copy final settings. */
bin_info->run_size = good_run_size;
bin_info->nregs = good_nregs;
bin_info->bitmap_offset = good_bitmap_offset;
bin_info->ctx0_offset = good_ctx0_offset;
bin_info->reg0_offset = good_redzone0_offset + bin_info->redzone_size;
assert(bin_info->reg0_offset - bin_info->redzone_size + (bin_info->nregs
* bin_info->reg_interval) + pad_size == bin_info->run_size);
return (good_run_size);
}
static void
bin_info_init(void)
{
arena_bin_info_t *bin_info;
size_t prev_run_size = PAGE;
#define SIZE_CLASS(bin, delta, size) \
bin_info = &arena_bin_info[bin]; \
bin_info->reg_size = size; \
prev_run_size = bin_info_run_size_calc(bin_info, prev_run_size);\
bitmap_info_init(&bin_info->bitmap_info, bin_info->nregs);
SIZE_CLASSES
#undef SIZE_CLASS
}
void
arena_boot(void)
{
size_t header_size;
unsigned i;
/*
* Compute the header size such that it is large enough to contain the
* page map. The page map is biased to omit entries for the header
* itself, so some iteration is necessary to compute the map bias.
*
* 1) Compute safe header_size and map_bias values that include enough
* space for an unbiased page map.
* 2) Refine map_bias based on (1) to omit the header pages in the page
* map. The resulting map_bias may be one too small.
* 3) Refine map_bias based on (2). The result will be >= the result
* from (2), and will always be correct.
*/
map_bias = 0;
for (i = 0; i < 3; i++) {
header_size = offsetof(arena_chunk_t, map) +
(sizeof(arena_chunk_map_t) * (chunk_npages-map_bias));
map_bias = (header_size >> LG_PAGE) + ((header_size & PAGE_MASK)
!= 0);
}
assert(map_bias > 0);
arena_maxclass = chunksize - (map_bias << LG_PAGE);
bin_info_init();
}
void
arena_prefork(arena_t *arena)
{
unsigned i;
malloc_mutex_prefork(&arena->lock);
for (i = 0; i < NBINS; i++)
malloc_mutex_prefork(&arena->bins[i].lock);
}
void
arena_postfork_parent(arena_t *arena)
{
unsigned i;
for (i = 0; i < NBINS; i++)
malloc_mutex_postfork_parent(&arena->bins[i].lock);
malloc_mutex_postfork_parent(&arena->lock);
}
void
arena_postfork_child(arena_t *arena)
{
unsigned i;
for (i = 0; i < NBINS; i++)
malloc_mutex_postfork_child(&arena->bins[i].lock);
malloc_mutex_postfork_child(&arena->lock);
}
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