Messages in this thread | | | Date | Sat, 23 Aug 2008 14:04:46 -0600 | From | Alex Chiang <> | Subject | Re: [PATCH, v2] PCI: create function symlinks in /sys/bus/pci/slots/N/ |
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* Greg KH <greg@kroah.com>: > 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.
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?
Thanks.
/ac
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