illumos gate

The do_logging_queue() function iterates over the logging_data queue and process it. Once an entry is processed it is placed into the lq_clean queue. This queue is cleaned at the end of the function run here:

325    while (lq_clean) {
326        lq = lq_clean;
327        lq_clean = lq->ld_next;
328
329        free_logging_data(lq);
330        cleared++;
331    }

When new entries are added to the logging_data queue with the same (or faster) rate as the do_logging_queue() is able to process, we will never free the processed entries, because we will loop processing the incoming entries.