#define ALIGN_UP(n, align) (((n) + (align)-1) & -(align))
#define ALIGN_DOWN(n, align) ((n) & -(align))
-void *smpi_shared_malloc_global__(size_t size, const char *file, int line, size_t *shared_block_offsets, int nb_shared_blocks) {
+/*
+ * Similar to smpi_shared_malloc, but only sharing the blocks described by shared_block_offsets.
+ * This array contains the offsets (in bytes) of the block to share.
+ * Even indices are the start offsets (included), odd indices are the stop offsets (excluded).
+ * For instance, if shared_block_offsets == {27, 42}, then the elements mem[27], mem[28], ..., mem[41] are shared. The others are not.
+ */
+void* smpi_shared_malloc_partial(size_t size, size_t* shared_block_offsets, int nb_shared_blocks)
+{
void *mem;
xbt_assert(smpi_shared_malloc_blocksize % PAGE_SIZE == 0, "The block size of shared malloc should be a multiple of the page size.");
/* First reserve memory area */
mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
- xbt_assert(mem != MAP_FAILED, "Failed to allocate %luMiB of memory. Run \"sysctl vm.overcommit_memory=1\" as root "
+ xbt_assert(mem != MAP_FAILED, "Failed to allocate %zuMiB of memory. Run \"sysctl vm.overcommit_memory=1\" as root "
"to allow big allocations.\n",
- (unsigned long)(size >> 20));
+ size >> 20);
/* Create bogus file if not done already */
if (smpi_shared_malloc_bogusfile == -1) {
for(int i_block = 0; i_block < nb_shared_blocks; i_block ++) {
size_t start_offset = shared_block_offsets[2*i_block];
size_t stop_offset = shared_block_offsets[2*i_block+1];
- xbt_assert(start_offset < stop_offset, "start_offset (%lu) should be lower than stop offset (%lu)", start_offset, stop_offset);
- xbt_assert(stop_offset <= size, "stop_offset (%lu) should be lower than size (%lu)", stop_offset, size);
+ xbt_assert(start_offset < stop_offset, "start_offset (%zu) should be lower than stop offset (%zu)", start_offset, stop_offset);
+ xbt_assert(stop_offset <= size, "stop_offset (%zu) should be lower than size (%zu)", stop_offset, size);
if(i_block < nb_shared_blocks-1)
xbt_assert(stop_offset < shared_block_offsets[2*i_block+2],
- "stop_offset (%lu) should be lower than its successor start offset (%lu)", stop_offset, shared_block_offsets[2*i_block+2]);
-// fprintf(stderr, "shared block 0x%x - 0x%x\n", start_offset, stop_offset);
+ "stop_offset (%zu) should be lower than its successor start offset (%zu)", stop_offset, shared_block_offsets[2*i_block+2]);
size_t start_block_offset = ALIGN_UP(start_offset, smpi_shared_malloc_blocksize);
size_t stop_block_offset = ALIGN_DOWN(stop_offset, smpi_shared_malloc_blocksize);
unsigned int i;
for (i = start_block_offset / smpi_shared_malloc_blocksize; i < stop_block_offset / smpi_shared_malloc_blocksize; i++) {
-// fprintf(stderr, "\tmmap:for 0x%x - 0x%x\n", i*smpi_shared_malloc_blocksize, smpi_shared_malloc_blocksize);
void* pos = (void*)((unsigned long)mem + i * smpi_shared_malloc_blocksize);
void* res = mmap(pos, smpi_shared_malloc_blocksize, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED | MAP_POPULATE,
smpi_shared_malloc_bogusfile, 0);
size_t low_page_start_offset = ALIGN_UP(start_offset, PAGE_SIZE);
size_t low_page_stop_offset = start_block_offset < ALIGN_DOWN(stop_offset, PAGE_SIZE) ? start_block_offset : ALIGN_DOWN(stop_offset, PAGE_SIZE);
if(low_page_start_offset < low_page_stop_offset) {
-// fprintf(stderr, "\tmmap:low 0x%x - 0x%x\n", low_page_start_offset, low_page_stop_offset-low_page_start_offset);
void* pos = (void*)((unsigned long)mem + low_page_start_offset);
void* res = mmap(pos, low_page_stop_offset-low_page_start_offset, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED | MAP_POPULATE,
smpi_shared_malloc_bogusfile, 0);
if(low_page_stop_offset <= stop_block_offset) {
size_t high_page_stop_offset = stop_offset == size ? size : ALIGN_DOWN(stop_offset, PAGE_SIZE);
if(high_page_stop_offset > stop_block_offset) {
-// fprintf(stderr, "\tmmap:high 0x%x - 0x%x\n", stop_block_offset, high_page_stop_offset-stop_block_offset);
void* pos = (void*)((unsigned long)mem + stop_block_offset);
void* res = mmap(pos, high_page_stop_offset-stop_block_offset, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED | MAP_POPULATE,
smpi_shared_malloc_bogusfile, 0);
return mem;
}
-/*
- * When nb_shared_blocks == -1, default behavior of smpi_shared_malloc: everything is shared.
- * Otherwise, only the blocks described by shared_block_offsets are shared.
- * This array contains the offsets (in bytes) of the block to share.
- * Even indices are the start offsets (included), odd indices are the stop offsets (excluded).
- * For instance, if shared_block_offsets == {27, 42}, then the elements mem[27], mem[28], ..., mem[41] are shared. The others are not.
- */
-static void *smpi_shared_malloc_global(size_t size, const char *file, int line, size_t *shared_block_offsets=NULL, int nb_shared_blocks=-1) {
- size_t tmp_shared_block_offsets[2];
- if(nb_shared_blocks == -1) {
- nb_shared_blocks = 1;
- shared_block_offsets = tmp_shared_block_offsets;
- shared_block_offsets[0] = 0;
- shared_block_offsets[1] = size;
- }
- return smpi_shared_malloc_global__(size, file, line, shared_block_offsets, nb_shared_blocks);
-}
-
void *smpi_shared_malloc(size_t size, const char *file, int line) {
- void *mem;
if (size > 0 && smpi_cfg_shared_malloc == shmalloc_local) {
- mem = smpi_shared_malloc_local(size, file, line);
+ return smpi_shared_malloc_local(size, file, line);
} else if (smpi_cfg_shared_malloc == shmalloc_global) {
- mem = smpi_shared_malloc_global(size, file, line);
- } else {
- mem = xbt_malloc(size);
- XBT_DEBUG("Classic malloc %zu in %p", size, mem);
+ int nb_shared_blocks = 1;
+ size_t shared_block_offsets[2] = {0, size};
+ return smpi_shared_malloc_partial(size, shared_block_offsets, nb_shared_blocks);
}
- return mem;
+ XBT_DEBUG("Classic malloc %zu", size);
+ return xbt_malloc(size);
}
int smpi_is_shared(void* ptr, std::vector<std::pair<size_t, size_t>> &private_blocks, size_t *offset){
xbt_free(meta->second.data);
}
- munmap(ptr, 0); // the POSIX says that I should not give 0 as a length, but it seems to work OK
+ munmap(ptr, meta->second.size);
} else {
XBT_DEBUG("Classic free of %p", ptr);
xbt_free(ptr);
