Re: [PATCH] memory hotplug disable boot option

Andi Kleen
2010-06-28T14:16:22Z

> I have a prototype patch sitting around somewhere. I think ultimately
> it makes sense to do something like extN's htree directory structure
> in sysfs. I wanted to get the tagged sysfs support in before I worked
> on scalability because that slightly changes the requirements.
>
> Improving the scalability here is certainly worth doing, but I am slightly
> concerned there is something else algorithmically wrong if this is still
> going to take 33 minutes to boot with 2TB.

I'm don't think thousands of entries in sysfs is really a good idea. Even if you fix
the the insert algorithm issues a simple ls will still be very slow and there
will be likely other issues too. And nobody can claim that's a good interface.

This really needs a better a interface.
e.g. add some wildcard entry as it was earlier proposed.
and only generate the wildcard when some threshold is exceeded.

-Andi