Kay Sievers wrote: > On Tue, May 26, 2009 at 12:19, Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx> wrote: > > >> Don't apply patch 2 then :-). >> > > No worry, we can not be that fast here. :) We need to get numbers first. > > Threads don't come for free, they make udev much less reliable and > harder to debug, compared to the current model. When all events share > the same address space, and the memory for the events gets reused for > forever, a simple bug will likely bring down the entire service, > unlike today where an event process may crash, but the event > management daemon will survive. Actually, I don't remember that the > main udev ever crashed, and that will definitely change with the > threads. :) > > I'm not against a threaded udevd, but we should have a good reason to > do it that way. We also need to get numbers on bigger boxes. Udev runs > on boxes with many thousands of events at bootup. we've seen boxes > with 20.000+ disks, where every disk has ~10 devices in sysfs. Some of > the SUSE customers requested to be able to run 4000+ events in > parallel, to bring the bootup time on such boxes down to a reasonable > time. That all works fine with today's udev and we need to be really > careful here. > > Thanks, > Kay > Noted and agreed. I'll work towards a complete series which can be tested and reviewed as a whole. Thanks Alan -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
