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sphakka
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Joined: 24 Jun 2003
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PostPosted: Tue Jul 03, 2012 8:39 pm    Post subject: multiple udevd processes Reply with quote

Hi there,

Today I discovered that there are 3 udevd processes running on my box (dual-core AMD):
Code:

$ ps aux | grep udevd
$ ps auxf | grep udevd
root      1179  0.0  0.0  17292   912 ?        Ss   09:35   0:00 /sbin/udevd --daemon
root     20820  0.0  0.0  17288   572 ?        S    21:16   0:00  \_ /sbin/udevd --daemon
root     20821  0.0  0.0  17288   584 ?        S    21:16   0:00  \_ /sbin/udevd --daemon

PID 1179 was started at boot, whereas the other two were possibly forked when the graphical desktop (KDE) is started. Indeed, in console with no xdm running, I was able to kill the forked processes; then, as xdm -> KDE was restarted, they reappeared... I can also kill the two extra process while KDE is running, and everything seems to run fine, though sometimes after a while they're back. Conversely, restarting udev seems to get rid of any clandestine process. I wonder what might trigger this behaviour (I suspect Phonon...)

Is that normal?

^s
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gorkypl
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PostPosted: Wed Jul 04, 2012 7:11 am    Post subject: Reply with quote

Yes, it is normal. At least I have the same and I do not use KDE, just a very simple X session without dbus or anything.
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sphakka
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PostPosted: Wed Jul 04, 2012 8:18 am    Post subject: Reply with quote

Still puzzled by that...
I can confirm that at least one udevd replica is spawned when XDM starts, so it might be a consequences of X accessing devices: on top of my head, touchpad + keyboard => 2 extra udevd processes?

Anyway, the system looks more responsive after the cleanup (i.e. killing extra processes)... 8-)
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PaulBredbury
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PostPosted: Wed Jul 04, 2012 8:34 am    Post subject: Reply with quote

Apparently they are worker threads.
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sphakka
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PostPosted: Wed Jul 04, 2012 9:05 am    Post subject: Reply with quote

PaulBredbury wrote:
Apparently they are worker threads.


Thanks, now clear! Urgh, udevd is becoming a Web server... worrisome...
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gorkypl
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PostPosted: Wed Jul 04, 2012 9:15 am    Post subject: Reply with quote

sphakka wrote:
udevd is becoming a Web server... worrisome...

This has already happened, almost...
http://lwn.net/Articles/490413/
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sphakka
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PostPosted: Wed Jul 04, 2012 9:47 am    Post subject: Reply with quote

gorkypl wrote:
sphakka wrote:
udevd is becoming a Web server... worrisome...

This has already happened, almost...
http://lwn.net/Articles/490413/


Indeed, I knew about that famous article! Hopefully, the gentoo folks will conjure up a udev-less configuration ;-)
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khayyam
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Joined: 07 Jun 2012
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PostPosted: Wed Jul 04, 2012 6:15 pm    Post subject: Reply with quote

sphakka wrote:
[...] Hopefully, the gentoo folks will conjure up a udev-less configuration

sphakka ... its quite possible, see the gentoo wiki article on using mdev (from busybox) as a udev replacement. The problem is that certain things don't (currently) work, such as lvm2.

The problem, I think, is not so much udev (which is little more than a hotplug service) but how the dependencies are being shaped, and mostly this is due to redhat/freedesktop/gnome's desire to create a one-size-fits-all "Desktop". I see this as being driven by two factors: the flawed logic of "usability" and "developing markets". Given the former is a complete abstraction (and should play no role in software developement) and the latter is highly volitile and precarious, it is likely to end in confusion.

best ... khay
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