static uint32_t
mc_action_get_exp_time(void)
{
struct mm_core *core = mm_core_selfptr();
mm_timeval_t real_time = mm_core_getrealtime(core);
return real_time / 1000000; // useconds -> seconds.
}
static bool
mc_action_find_victims(struct mc_tpart *part,
struct mm_stack *victims,
uint32_t nrequired)
{
uint32_t nvictims = 0;
mm_stack_prepare(victims);
struct mm_core *core = mm_core_selfptr();
mm_timeval_t real_time = mm_core_getrealtime(core);
uint32_t time = real_time / 1000000; // useconds -> seconds.
bool end = false;
while (nvictims < nrequired) {
struct mc_entry *hand = part->clock_hand;
if (unlikely(hand == part->entries_end)) {
// Prevent infinite loop.
if (end)
break;
else
end = true;
hand = part->entries;
}
uint8_t state = hand->state;
if (state >= MC_ENTRY_USED_MIN && state <= MC_ENTRY_USED_MAX) {
if (mc_action_is_eviction_victim(part, hand, time)) {
uint32_t index = mc_table_index(part, hand->hash);
struct mm_stack *bucket = &part->buckets[index];
mc_action_remove_entry(part, &bucket->head, hand);
mm_stack_insert(victims, &hand->link);
++nvictims;
} else {
hand->state--;
}
}
part->clock_hand = hand + 1;
}
return (nvictims > 0 && nvictims == nrequired);
}
static void
mc_command_flush(uint32_t exptime)
{
// TODO: really use the exptime.
struct mm_core *core = mm_core_selfptr();
mm_timeval_t real_time = mm_core_getrealtime(core);
mc_exptime = real_time / 1000000 + exptime;
for (mm_core_t i = 0; i < mc_table.nparts; i++) {
#if ENABLE_MEMCACHE_DELEGATE
struct mc_tpart *part = &mc_table.parts[i];
mm_core_post(part->core, mc_command_flush_routine, i);
#else
struct mc_action action;
action.part = &mc_table.parts[i];
mc_action_flush(&action);
#endif
}
}
