Messages in this thread | ![/](/images/icornerl.gif) | | Date | Fri, 11 Apr 2003 15:35:52 -0700 | From | Steven Dake <> | Subject | Re: [ANNOUNCE] udev 0.1 release |
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Arnd Bergmann wrote:
>Greg KH wrote: > > > >>On Fri, Apr 11, 2003 at 01:29:57PM -0700, Steven Dake wrote: >> >> >>>It gets even worse, because performance of hotswap events on disk adds >>>is critical and spawning processes is incredibly slow compared to the >>>performance required by some telecom applications... >>> >>> >>It's critical that we quick name this disk within X milliseconds after >>it has been added to the system? What spec declares this? >> >> > >While the problem might not really be the per-device latency, what should >be handled correctly is the following scenario: > >- Someone accidentally removes the cable that connects a few hundred > (mounted) disks >- The cable is replaced, but - oops - to the wrong socket >- The person notices the error and now places the cable into the right > socket. > >At this time we have four concurrent hotplug events for every single >disks that we want to be finished in order and we want every disk >to end up with its original minor number in the end. If this is not >possible, the system still needs to be in a sensible state after this. > > Yes, and in the rest of my email, I stated this would be solved by replacing /sbin/hotplug with a mechanism to communicate events to a user space daemon which would process requests in order as submitted by the kernel. (All except the same minor/major, which may or may not happen). If the kernel is evil and doesn't submit events in order, thats another problem to solve, but it should for disk events, atleast.
> Arnd <>< >- >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html >Please read the FAQ at http://www.tux.org/lkml/ > > > > >
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