IMAP hibernate feature committed

[Thomas Leuxner]

* Timo Sirainen <tss at iki.fi> 2015.08.29 12:20:

> Set verbose_proctitle=yes and you'll see what the imap processes are doing. It'll show IDLE in the ps output if the client is IDLEing. Although it doesn't say how long the client has been doing it.

dovenull  1318  0.0  0.0  18340  4772 ?        S    17:50   0:00 dovecot/imap-login [1 connections (1 TLS)]
dovenull  1333  0.0  0.0  18340  4576 ?        S    17:50   0:00 dovecot/imap-login [1 connections (1 TLS)]
dovenull  1335  0.0  0.0  18200  4652 ?        S    17:50   0:00 dovecot/imap-login
dovenull  1336  0.0  0.0  18200  4676 ?        S    17:50   0:00 dovecot/imap-login
dovenull  1342  0.0  0.0  18340  4772 ?        S    17:51   0:00 dovecot/imap-login [1 connections (1 TLS)]
dovenull  1704  0.0  0.0  18200  4572 ?        S    19:15   0:00 dovecot/imap-login
dovenull  1709  0.0  0.0  18200  4652 ?        S    19:15   0:00 dovecot/imap-login
dovenull  1711  0.0  0.0  18200  4636 ?        S    19:15   0:00 dovecot/imap-login
dovenull  1994  0.0  0.0  18200  4740 ?        S    20:56   0:00 dovecot/imap-login
dovenull  1997  0.0  0.0  18200  4568 ?        S    20:56   0:00 dovecot/imap-login
vmail     1998  0.0  0.0  45448 10048 ?        S    20:56   0:00 dovecot/imap [tlx at leuxner.net 1.2.3.4 IDLE]
dovenull  1999  0.0  0.0  18340  4732 ?        S    20:56   0:00 dovecot/imap-login [1 connections (1 TLS)]
dovenull  2001  0.0  0.0  18200  4796 ?        S    20:56   0:00 dovecot/imap-login
vmail     2002  0.0  0.0  52880 13500 ?        S    20:56   0:00 dovecot/imap [tlx at leuxner.net 1.2.3.4 IDLE]
dovecot   2008  0.0  0.0   9380   936 ?        S    20:57   0:00 dovecot/imap-hibernate [2 connections]

After disabling "check for new messages" polling in the client it looks a lot better, multiple connections have been hibernated. Thanks.
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