On Sat, Aug 23, 2008 at 02:04:46PM -0600, Alex Chiang wrote: > * Greg KH <greg@xxxxxxxxx>: > > On Fri, Aug 22, 2008 at 01:53:58PM -0600, Alex Chiang wrote: > > > > > > Does anyone have numbers for how much it costs to create a new > > > symlink? I could try and figure this out but it will take a few > > > days (busy with other stuff). > > > > Almost nothing. > > > > sysfs creates these things on the fly as they are accessed, and if > > memory pressure on the machine happens, they are freed up properly and > > then created again if a user asks to see them in the tree. > > > > So don't worry about memory issues when adding new files or symlinks in > > sysfs, it just isn't a problem (we handle 20000 disks easily on low > > memory 31bit s390 systems.) > > Great, thanks for the explanation. I've heard the "memory > overhead" argument before for not wanting to create other sysfs > files/links, so this will be good to debunk that bogeyman if it > pops up again in the future. Yes, please do. > Did you get a chance to take a look at the documentation I wrote > for these new symlinks? [I also went and documented the existing > slots/ directory as well...] > > Was it what you had in mind? Yes, it looked very good. And thanks for the other documentation as well, if you want, you could split that out as a different patch and odds are Jesse could get that into the tree before 2.6.27 comes out :) thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
