I found that autovacuum launcher does not launch any workers in HEAD.
AFAICS, we track the time to be vaccumed of each database in the following way:
1. In rebuild_database_list(), we initialize avl_dbase->adl_next_worker with (current_time + autovacuum_naptime /
nDBs).
2. In do_start_worker(), we skip database entries that adl_next_worker is between current_time and current_time +
autovacuum_naptime.
3. If there is no jobs in do_start_worker(), we call rebuild_database_list() to rebuild database entries.
The point is we use the same range (current_time and current_time +
autovacuum_naptime) at 1 and 2. We set adl_next_worker with values in the
range, and drop all of them at 2 because their values are in the range.
And if there is no database to vacuum, we re-initilaize database list at 3,
then we repeat the cycle.
Or am I missing something?
Regards,
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ITAGAKI Takahiro
NTT Open Source Software Center