About memory consumption of pg_keeper

[55masakazu]

I have a question.
pg_keeper process uses a lot of physical memory.
Appears to increase over time.
Is this the expected behavior?

ps aux command result:
USER PID %CPU %MEM SIZE RSS TTY STAT START TIME COMMAND
Just after starting
postgres 4612 0.0 0.8 2414756 48460 ? Ss Jun04 0:10 postgres: bgworker: pg_keeper(master:connected)
1month has passed(Increased from 48MB to 1.6GB. It seems to increase by 50 MB per day)
postgres 4612 0.0 27.0 3975384 1608928 ? Ss Jun04 6:36 postgres: bgworker: pg_keeper(master:connected)

Environment:
Redhat Linux:7.2
PostgreSql:9.5.4
pg_keeper:REL1_0_STABLE