}
// 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);
+// 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) {