Re: [RFC] reliability and scalability

[Kay Sievers <kay.sievers@vrfy.org>]

On Sat, Feb 07, 2004 at 03:01:29AM -0500, Chris Friesen wrote:
> 
> I've got a couple more ideas for improving udevd, but before I go crazy
> with this I wanted to get some opinions from people more experienced
> than me.
> 
> First, how paranoid should we be about reliability?  Right now there is a
> (low) possibility of udevd crashing with unhandled messages on its rx
> buffer, thus losing one or more hotplug events.  Is this a problem?
> Would people welcome a patch that closes the loop by sending an ack back
> to udevsend?

I don't care. What you want to do with the information in udevsend?

> Second, how many udev instances are we expecting to have outstanding at
> a time?  There are a couple of places in udevd (specifically the devpath
> check and the udev_done code) that with the current data structures end
> up being worst case ofO(n^2).  Is this a problem?  The average user will
> never have an issue, but if we suddenly plug in a few thousand disks (a
> number that's been mentioned before), is it a big deal if it takes a
> bit longer to add them all?  I see ways of getting around this, but
> it may be overkill.

We may limit the size of the run_queue, and hold back the forks when to
many udev's already running.

thanks,
Kay


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