typedef struct {
size_t size;
+ std::vector<std::pair<int, int>> private_blocks;
shared_data_key_type* data;
} shared_metadata_t;
}
// Align functions, from http://stackoverflow.com/questions/4840410/how-to-align-a-pointer-in-c
+#define PAGE_SIZE 0x1000
#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, int *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);
/* Map the bogus file in place of the anonymous memory */
for(int i_block = 0; i_block < nb_shared_blocks; i_block ++) {
- int start_offset = ALIGN_UP(shared_block_offsets[2*i_block], smpi_shared_malloc_blocksize);
- int stop_offset = ALIGN_DOWN(shared_block_offsets[2*i_block+1], smpi_shared_malloc_blocksize);
+ int start_offset = shared_block_offsets[2*i_block];
+ int stop_offset = shared_block_offsets[2*i_block+1];
+ xbt_assert(0 <= start_offset, "start_offset (%d) should be greater than 0", start_offset);
+ xbt_assert(start_offset < stop_offset, "start_offset (%d) should be lower than stop offset (%d)", start_offset, stop_offset);
+ xbt_assert(stop_offset <= size, "stop_offset (%d) should be lower than size (%lu)", stop_offset, size);
+ if(i_block < nb_shared_blocks-1)
+ xbt_assert(stop_offset < shared_block_offsets[2*i_block+2],
+ "stop_offset (%d) should be lower than its successor start offset (%d)", stop_offset, shared_block_offsets[2*i_block+2]);
+// fprintf(stderr, "shared block 0x%x - 0x%x\n", start_offset, stop_offset);
+ int start_block_offset = ALIGN_UP(start_offset, smpi_shared_malloc_blocksize);
+ int stop_block_offset = ALIGN_DOWN(stop_offset, smpi_shared_malloc_blocksize);
unsigned int i;
- for (i = start_offset / smpi_shared_malloc_blocksize; i < stop_offset / smpi_shared_malloc_blocksize; 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);
"You can also try using the sysctl vm.max_map_count",
strerror(errno));
}
+ int low_page_start_offset = ALIGN_UP(start_offset, PAGE_SIZE);
+ int 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);
+ xbt_assert(res == pos, "Could not map folded virtual memory (%s). Do you perhaps need to increase the "
+ "size of the mapped file using --cfg=smpi/shared-malloc-blocksize=newvalue (default 1048576) ?"
+ "You can also try using the sysctl vm.max_map_count",
+ strerror(errno));
+ }
+ if(low_page_stop_offset <= stop_block_offset) {
+ int 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);
+ xbt_assert(res == pos, "Could not map folded virtual memory (%s). Do you perhaps need to increase the "
+ "size of the mapped file using --cfg=smpi/shared-malloc-blocksize=newvalue (default 1048576) ?"
+ "You can also try using the sysctl vm.max_map_count",
+ strerror(errno));
+ }
+ }
}
- if(nb_shared_blocks == 1 && shared_block_offsets[0] == 0 && shared_block_offsets[1] == size) {
- shared_metadata_t newmeta;
- //register metadata for memcpy avoidance
- shared_data_key_type* data = (shared_data_key_type*)xbt_malloc(sizeof(shared_data_key_type));
- data->second.fd = -1;
- data->second.count = 1;
- newmeta.size = size;
- newmeta.data = data;
- allocs_metadata[mem] = newmeta;
+ shared_metadata_t newmeta;
+ //register metadata for memcpy avoidance
+ shared_data_key_type* data = (shared_data_key_type*)xbt_malloc(sizeof(shared_data_key_type));
+ data->second.fd = -1;
+ data->second.count = 1;
+ newmeta.size = size;
+ newmeta.data = data;
+ if(shared_block_offsets[0] > 0) {
+ newmeta.private_blocks.push_back(std::make_pair(0, shared_block_offsets[0]));
+ }
+ int i_block;
+ for(i_block = 0; i_block < nb_shared_blocks-1; i_block ++) {
+ newmeta.private_blocks.push_back(std::make_pair(shared_block_offsets[2*i_block+1], shared_block_offsets[2*i_block+2]));
+ }
+ if(shared_block_offsets[2*i_block+1] < size) {
+ newmeta.private_blocks.push_back(std::make_pair(shared_block_offsets[2*i_block+1], size));
}
+ allocs_metadata[mem] = newmeta;
return mem;
}
return mem;
}
-int smpi_is_shared(void* ptr){
+int smpi_is_shared(void* ptr, std::vector<std::pair<int, int>> &private_blocks, int *offset){
+ private_blocks.clear(); // being paranoid
if (allocs_metadata.empty())
return 0;
if ( smpi_cfg_shared_malloc == shmalloc_local || smpi_cfg_shared_malloc == shmalloc_global) {
auto low = allocs_metadata.lower_bound(ptr);
- if (low->first==ptr)
+ if (low->first==ptr) {
+ private_blocks = low->second.private_blocks;
+ *offset = 0;
return 1;
+ }
if (low == allocs_metadata.begin())
return 0;
low --;
- if (ptr < (char*)low->first + low->second.size)
+ if (ptr < (char*)low->first + low->second.size) {
+ xbt_assert(ptr > (char*)low->first, "Oops, there seems to be a bug in the shared memory metadata.");
+ *offset = ((uint8_t*)ptr) - ((uint8_t*) low->first);
+ private_blocks = low->second.private_blocks;
return 1;
+ }
return 0;
} else {
return 0;
}
}
+std::vector<std::pair<int, int>> shift_private_blocks(const std::vector<std::pair<int, int>> vec, int offset) {
+ std::vector<std::pair<int, int>> result;
+ for(auto block: vec) {
+ auto new_block = std::make_pair(std::max(0, block.first-offset), std::max(0, block.second-offset));
+ if(new_block.second > 0)
+ result.push_back(new_block);
+ }
+ return result;
+}
+
+void append_or_merge_block(std::vector<std::pair<int, int>> &vec, std::pair<int, int> &block) {
+ if(vec.size() > 0 && block.first <= vec.back().second) { // overlapping with the last block inserted
+ vec.back().second = std::max(vec.back().second, block.second);
+ }
+ else { // not overlapping, we insert a new block
+ vec.push_back(block);
+ }
+}
+
+std::vector<std::pair<int, int>> merge_private_blocks(std::vector<std::pair<int, int>> src, std::vector<std::pair<int, int>> dst) {
+ std::vector<std::pair<int, int>> result;
+ unsigned i_src=0, i_dst=0;
+ while(i_src < src.size() && i_dst < dst.size()) {
+ std::pair<int, int> block;
+ if(src[i_src].first < dst[i_dst].first) {
+ block = src[i_src];
+ i_src ++;
+ }
+ else {
+ block = dst[i_dst];
+ i_dst ++;
+ }
+ append_or_merge_block(result, block);
+ }
+ for(; i_src < src.size(); i_src++) {
+ append_or_merge_block(result, src[i_src]);
+ }
+ for(; i_dst < dst.size(); i_dst++) {
+ append_or_merge_block(result, dst[i_dst]);
+ }
+ return result;
+}
+
void smpi_shared_free(void *ptr)
{
if (smpi_cfg_shared_malloc == shmalloc_local) {
