/*
* This builds our object tree. The Heirarchy is pretty straightforward
* At the top are numa_nodes
* All CPU packages belong to a single numa_node
* All Cache domains belong to a CPU package
* All CPU cores belong to a cache domain
*
* Objects are built in that order (top down)
*
* Object workload is the aggregate sum of the
* workload of the objects below it
*/
static void build_object_tree(void)
{
build_numa_node_list();
parse_cpu_tree();
rebuild_irq_db();
}
int main(int argc, char** argv)
{
if (argc>1 && strstr(argv[1],"debug"))
debug_mode=1;
if (argc>1 && strstr(argv[1],"oneshot"))
one_shot_mode=1;
if (getenv("IRQBALANCE_BANNED_CPUS")) {
cpumask_parse_user(getenv("IRQBALANCE_BANNED_CPUS"), strlen(getenv("IRQBALANCE_BANNED_CPUS")), banned_cpus);
}
if (getenv("IRQBALANCE_ONESHOT"))
one_shot_mode=1;
if (getenv("IRQBALANCE_DEBUG"))
debug_mode=1;
parse_cpu_tree();
/* On single core UP systems irqbalance obviously has no work to do */
if (core_count<2)
exit(EXIT_SUCCESS);
/* On dual core/hyperthreading shared cache systems just do a one shot setup */
if (cache_domain_count==1)
one_shot_mode = 1;
if (!debug_mode)
if (daemon(0,0))
exit(EXIT_FAILURE);
#ifdef HAVE_LIBCAP_NG
// Drop capabilities
capng_clear(CAPNG_SELECT_BOTH);
capng_lock();
capng_apply(CAPNG_SELECT_BOTH);
#endif
parse_proc_interrupts();
sleep(SLEEP_INTERVAL/4);
reset_counts();
parse_proc_interrupts();
pci_numa_scan();
calculate_workload();
sort_irq_list();
if (debug_mode)
dump_workloads();
while (1) {
sleep_approx(SLEEP_INTERVAL);
if (debug_mode)
printf("\n\n\n-----------------------------------------------------------------------------\n");
check_power_mode();
parse_proc_interrupts();
/* cope with cpu hotplug -- detected during /proc/interrupts parsing */
if (need_cpu_rescan) {
need_cpu_rescan = 0;
/* if there's a hotplug event we better turn off power mode for a bit until things settle */
power_mode = 0;
if (debug_mode)
printf("Rescanning cpu topology \n");
reset_counts();
clear_work_stats();
clear_cpu_tree();
parse_cpu_tree();
}
/* deal with NAPI */
account_for_nic_stats();
calculate_workload();
/* to cope with dynamic configurations we scan for new numa information
* once every 5 minutes
*/
if (counter % NUMA_REFRESH_INTERVAL == 16)
pci_numa_scan();
calculate_placement();
activate_mapping();
if (debug_mode)
dump_tree();
if (one_shot_mode)
break;
counter++;
}
return EXIT_SUCCESS;
}
