int memcpy_h2d
(devapi_t *devapi, unsigned idev, void *tgt, void *src, size_t nbytes,
size_t devoff) {
// time API call
rtime_t start_time, end_time;
if(stat_enabled())
start_time = rtime_get();
sigprocmask(SIG_BLOCK, &devapi_block_sig_g, 0);
int err = devapi->memcpy_h2d(idev, tgt, src, nbytes, devoff);
sigprocmask(SIG_UNBLOCK, &devapi_block_sig_g, 0);
if(stat_enabled()) {
end_time = rtime_get();
stat_acc_double(GPUVM_STAT_HOST_COPY_TIME, rtime_diff(&start_time, &end_time));
}
return err;
} // memcpy_h2d
// Start all schedulers in the VM
void
machine::start(void)
{
// execute constants code
execute_const_code();
deactivate_signals();
// Statistics sampling
if(stat_enabled()) {
// initiate alarm thread
alarm_thread = new boost::thread(bind(&machine::slice_function, this));
}
vm::All->ALL_THREADS[0]->start();
if(alarm_thread) {
kill(getpid(), SIGUSR1);
alarm_thread->join();
delete alarm_thread;
alarm_thread = NULL;
slices.write(get_stat_file(), sched_type, vm::All);
}
const bool will_print(show_database || dump_database);
if(will_print) {
if(show_database)
vm::All->DATABASE->print_db(cout);
if(dump_database)
vm::All->DATABASE->dump_db(cout);
}
if(memory_statistics) {
#ifdef MEMORY_STATISTICS
cout << "Total memory in use: " << get_memory_in_use() / 1024 << "KB" << endl;
cout << "Malloc()'s called: " << get_num_mallocs() << endl;
#else
cout << "Memory statistics support was not compiled in" << endl;
#endif
}
}
/** thread routine for the thread which does unprotection of regions */
static void *unprot_thread(void *dummy_param) {
unprot_thread_g = self_thread();
if(semaph_post(&init_sem_g)) {
fprintf(stderr, "unprot_thread: can\'t post init semaphore\n");
return 0;
}
rqueue_elem_t elem;
// the number of regions which have been unprotected, but have not yet been
// synced to host
unsigned pending_regions = 0;
// starting and ending time for this time period
rtime_t start_time, end_time;
while(1) {
rqueue_get(&unprot_queue_g, &elem);
region_t *region = elem.region;
switch(elem.op) {
case REGION_OP_QUIT:
// quit the thread
return 0;
case REGION_OP_UNPROTECT:
//fprintf(stderr, "unprotect request received\n");
stat_inc(GPUVM_STAT_PAGEFAULTS);
if(region->prot_status == PROT_NONE) {
// fully unprotect region
// remove protection, stop threads if necessary
if(!pending_regions) {
if(stat_enabled())
start_time = rtime_get();
//fprintf(stderr, "stopping other threads\n");
stop_other_threads();
//fprintf(stderr, "stopped other threads\n");
}
region_unprotect(region);
//fprintf(stderr, "unprotect request satisfied - BLOCK\n");
region_post_unprotect(region);
pending_regions++;
elem.op = REGION_OP_SYNC_TO_HOST;
rqueue_put(&sync_queue_g, &elem);
} else if(region->prot_status == PROT_READ) {
// mark all data as actual on host only, no need to stop threads
subreg_list_t *list;
region_unprotect(region);
for(list = region->subreg_list; list; list = list->next)
subreg_sync_to_host(list->subreg);
//fprintf(stderr, "unprotect request satisfied - RO\n");
region_post_unprotect(region);
} else {
// do nothing
//fprintf(stderr, "unprotect request satisfied - NONE\n");
region_post_unprotect(region);
}
//fprintf(stderr, "unprotect message posted\n");
break;
case REGION_OP_SYNCED_TO_HOST:
pending_regions--;
if(!pending_regions) {
//fprintf(stderr, "continuing other threads\n");
cont_other_threads();
if(stat_enabled()) {
end_time = rtime_get();
stat_acc_unblocked_double(GPUVM_STAT_PAGEFAULT_TIME,
rtime_diff(&start_time, &end_time));
}
} // if(!pending_regions)
break;
default:
fprintf(stderr, "unprot_thread: invalid region operation %d\n", elem.op);
break;
} // switch(elem->op)
} // while()
} // unprot_thread()