[systemd-devel] systemd-readahead and often used applications

[Reindl Harald]

Am 14.04.2013 20:49, schrieb Kok:
>> a reason i would love to define specific applications which should
>> always get preloaded on boot independent what is collected at runtime
>> what about starting the machine remove vis WOL and never login because
>> some data sync and shutdown 2 hours later - will the desktop get lost
>> from the readahead-collection - questions over questions...
> 
> feel free to contribute code or algorithm's to improve, I'll be more
> than welcome to take concrete contributions as I've been trying to
> improve on readahead for several years now. There is certainly room
> for improvement, but the devil is in the details

if i only could C/C++ additionally to PHP/SQL and had time to
work that out by 3 fulltime-jobs for one man :-(

playing around with "/usr/lib/systemd/systemd-readahead collect"
it looks like it re-creates /.readahead from scratch, meaning
you lose also anything covered from the boot-run

what about a dbus-triggered instance like cups and other services
are fired up after login which creates a /.readahead-usersession
proceeded at boot the same way as /.readahead

not saying i am able to implement anything, sorry, but i try
to brain-storm ideas here

>> seems like i covered a bug
>> the collector stops after exactly 2 minutes
>
> src/readahead/readahead.c has:
>
> usec_t arg_timeout = 2*USEC_PER_MINUTE;
>
> so, it's by design to stop after 2 minutes.
>
> That's for a good reason, I'm not sure if changing it makes much sense
> - most people will never want to use non-standard values, and 2
> minutes helps everyone (it could help some non-standard cases more,
> but it doesn't hurt anyone)

well, but that makes "systemd-readahead-done.timer" useless as also
extend how long the collector should run

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