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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
static pthread_mutex_t malloc_disabled_lock = PTHREAD_MUTEX_INITIALIZER;
static bool malloc_disabled_tcache;
static void je_iterate_chunk(arena_chunk_t *chunk,
void (*callback)(uintptr_t ptr, size_t size, void* arg), void* arg);
static void je_iterate_small(arena_run_t *run,
void (*callback)(uintptr_t ptr, size_t size, void* arg), void* arg);
/* je_iterate calls callback for each allocation found in the memory region
* between [base, base+size). base will be rounded down to by the jemalloc
* chunk size, and base+size will be rounded up to the chunk size. If no memory
* managed by jemalloc is found in the requested region, je_iterate returns -1
* and sets errno to EINVAL.
*
* je_iterate must be called when no allocations are in progress, either
* when single-threaded (for example just after a fork), or between
* jemalloc_prefork() and jemalloc_postfork_parent(). The callback must
* not attempt to allocate with jemalloc.
*/
int je_iterate(uintptr_t base, size_t size,
void (*callback)(uintptr_t ptr, size_t size, void* arg), void* arg) {
int error = EINVAL;
uintptr_t ptr = (uintptr_t)CHUNK_ADDR2BASE(base);
uintptr_t end = CHUNK_CEILING(base + size);
while (ptr < end) {
assert(ptr == (uintptr_t)CHUNK_ADDR2BASE(ptr));
extent_node_t *node;
node = chunk_lookup((void *)ptr, false);
if (node == NULL) {
ptr += chunksize;
continue;
}
assert(extent_node_achunk_get(node) ||
(uintptr_t)extent_node_addr_get(node) == ptr);
error = 0;
if (extent_node_achunk_get(node)) {
/* Chunk */
arena_chunk_t *chunk = (arena_chunk_t *)ptr;
ptr += chunksize;
if (&chunk->node != node) {
/* Empty retained chunk */
continue;
}
je_iterate_chunk(chunk, callback, arg);
} else if ((uintptr_t)extent_node_addr_get(node) == ptr) {
/* Huge allocation */
callback(ptr, extent_node_size_get(node), arg);
ptr = CHUNK_CEILING(ptr + extent_node_size_get(node));
}
}
if (error) {
set_errno(error);
return -1;
}
return 0;
}
/* Iterate over a valid jemalloc chunk, calling callback for each large
* allocation run, and calling je_iterate_small for each small allocation run */
static void je_iterate_chunk(arena_chunk_t *chunk,
void (*callback)(uintptr_t ptr, size_t size, void* arg), void* arg) {
size_t pageind;
pageind = map_bias;
while (pageind < chunk_npages) {
size_t mapbits;
size_t size;
mapbits = arena_mapbits_get(chunk, pageind);
if (!arena_mapbits_allocated_get(chunk, pageind)) {
/* Unallocated run */
size = arena_mapbits_unallocated_size_get(chunk, pageind);
} else if (arena_mapbits_large_get(chunk, pageind)) {
/* Large allocation run */
void *rpages;
size = arena_mapbits_large_size_get(chunk, pageind);
rpages = arena_miscelm_to_rpages(arena_miscelm_get_mutable(chunk, pageind));
callback((uintptr_t)rpages, size, arg);
} else {
/* Run of small allocations */
szind_t binind;
arena_run_t *run;
assert(arena_mapbits_small_runind_get(chunk, pageind) == pageind);
binind = arena_mapbits_binind_get(chunk, pageind);
run = &arena_miscelm_get_mutable(chunk, pageind)->run;
assert(run->binind == binind);
size = arena_bin_info[binind].run_size;
je_iterate_small(run, callback, arg);
}
assert(size == PAGE_CEILING(size));
assert(size > 0);
pageind += size >> LG_PAGE;
}
}
/* Iterate over a valid jemalloc small allocation run, calling callback for each
* active allocation. */
static void je_iterate_small(arena_run_t *run,
void (*callback)(uintptr_t ptr, size_t size, void* arg), void* arg) {
szind_t binind;
const arena_bin_info_t *bin_info;
uint32_t regind;
uintptr_t ptr;
void *rpages;
binind = run->binind;
bin_info = &arena_bin_info[binind];
rpages = arena_miscelm_to_rpages(arena_run_to_miscelm(run));
ptr = (uintptr_t)rpages + bin_info->reg0_offset;
for (regind = 0; regind < bin_info->nregs; regind++) {
if (bitmap_get(run->bitmap, &bin_info->bitmap_info, regind)) {
callback(ptr, bin_info->reg_size, arg);
}
ptr += bin_info->reg_interval;
}
}
static void je_malloc_disable_prefork() {
pthread_mutex_lock(&malloc_disabled_lock);
}
static void je_malloc_disable_postfork_parent() {
pthread_mutex_unlock(&malloc_disabled_lock);
}
static void je_malloc_disable_postfork_child() {
pthread_mutex_init(&malloc_disabled_lock, NULL);
}
void je_malloc_disable_init() {
if (pthread_atfork(je_malloc_disable_prefork,
je_malloc_disable_postfork_parent, je_malloc_disable_postfork_child) != 0) {
malloc_write("<jemalloc>: Error in pthread_atfork()\n");
if (opt_abort)
abort();
}
}
void je_malloc_disable() {
static pthread_once_t once_control = PTHREAD_ONCE_INIT;
pthread_once(&once_control, je_malloc_disable_init);
pthread_mutex_lock(&malloc_disabled_lock);
bool new_tcache = false;
size_t old_len = sizeof(malloc_disabled_tcache);
je_mallctl("thread.tcache.enabled",
&malloc_disabled_tcache, &old_len,
&new_tcache, sizeof(new_tcache));
jemalloc_prefork();
}
void je_malloc_enable() {
jemalloc_postfork_parent();
if (malloc_disabled_tcache) {
je_mallctl("thread.tcache.enabled", NULL, NULL,
&malloc_disabled_tcache, sizeof(malloc_disabled_tcache));
}
pthread_mutex_unlock(&malloc_disabled_lock);
}
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