/*
* return true if ring migration is recommended.
*/
bool ring_allocation_logic::should_migrate_ring()
{
if (!is_logic_support_migration()) {
return false;
}
if (m_ring_migration_ratio < 0) {
return false;
}
ral_logfuncall("currently accessed from thread=%lu, cpu=%d", pthread_self(), sched_getcpu());
int count_max = m_ring_migration_ratio;
if (m_migration_candidate) {
count_max = CANDIDATE_STABILITY_ROUNDS;
uint64_t new_id = calc_res_key_by_logic();
if (m_migration_candidate != new_id) {
m_migration_candidate = 0;
m_migration_try_count = 0;
return false;
}
}
if (m_migration_try_count < count_max) {
m_migration_try_count++;
return false;
} else {
m_migration_try_count = 0;
}
if (!m_migration_candidate) {
// save current used allocation key
// no need to save profile, and allocation logic
uint64_t curr_id = m_res_key.get_user_id_key();
// calc new key
uint64_t new_id = calc_res_key_by_logic();
if (new_id == curr_id || g_n_internal_thread_id == curr_id) {
return false;
}
m_migration_candidate = new_id;
return false;
}
ral_logdbg("migrating from ring of id=%s to ring of id=%lu",
m_res_key.to_str(), m_migration_candidate);
m_migration_candidate = 0;
return true;
}
ring_allocation_logic::ring_allocation_logic(ring_logic_t allocation_logic,
int ring_migration_ratio, source_t source,
resource_allocation_key &ring_profile):
m_tostr("base"), m_ring_migration_ratio(ring_migration_ratio),
m_source(source), m_migration_try_count(ring_migration_ratio)
{
if (ring_profile.get_ring_alloc_logic() == RING_LOGIC_PER_INTERFACE &&
ring_profile.get_ring_profile_key() < START_RING_INDEX) {
ring_profile.set_ring_alloc_logic(allocation_logic);
}
m_res_key = resource_allocation_key(ring_profile);
m_migration_candidate = 0;
m_res_key.set_user_id_key(calc_res_key_by_logic());
}
resource_allocation_key* ring_allocation_logic::create_new_key(in_addr_t addr, int suggested_cpu /* = NO_CPU */)
{
if (m_res_key.get_ring_alloc_logic() == RING_LOGIC_PER_CORE_ATTACH_THREADS) {
pthread_t tid = pthread_self();
int cpu = g_cpu_manager.reserve_cpu_for_thread(tid, suggested_cpu);
if (cpu >= 0) {
m_res_key.set_user_id_key(cpu);
return &m_res_key;
}
}
if (m_res_key.get_ring_alloc_logic() == RING_LOGIC_PER_IP) {
m_source.m_ip = addr;
}
m_res_key.set_user_id_key(calc_res_key_by_logic());
return &m_res_key;
}
