[Dovecot] Dovecot waking every 50ms when doing nothing

[Timo Sirainen]

On Sun, 2007-06-03 at 18:05 +0300, Timo Sirainen wrote:
> > My laptop runs a local IMAP server so that I'm immune from breaking my
> > mail client, and when playing around with powertop I discovered that
> > Dovecot (in particular imap-login) wakes up every 1000ms and then every
> > 50ms even when no clients are connected.  A bit of stracing shows this:
> 
> I did once try to reduce these unnecessary wakeups, but then I thought
> it's probably not worth the trouble. No-one's going to run an IMAP
> server in their laptop.. :)
> 
> This fixes it for imap/pop3-login:
> http://hg.dovecot.org/dovecot/rev/0021765627f3
> 
> Fixing dovecot-auth and dovecot processes is a bit more difficult.
> Patches welcome. :)

Maybe the optimal solution would be to create a new abstraction layer.
Most of the timeout handlers are just checking for idle timeouts.

struct idle_timeout *idle_timeout_new(unsigned int secs,
timeout_callback_t *callback, void *context);
void idle_timeout_free(struct idle_timeout *idle);
void idle_timeout_reset(struct idle_timeout *idle);

The code would internally keep just one timeout handler and whenever
it's called, calculate the new time when it should be called.
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