RE: [PATCH] Convert pgtable cache to slab

Luck, Tony
2005-02-11T18:51:12Z

>> Do you have some before/after numbers from lmbench fork overhead
>> (I wouldn't expect much impact from this, but it would be nice to
>> make sure).
>
>I am running lmbench even as we speak. Is there a way to run lmbench
>and only get the fork overhead information?

You can run the "lat_proc" binary with the "fork" argument.

>I started with this patch because it goes part of the way to where I
>need to be. I am trying to get 4 level page table directories working
>efficiently on SGI boxes. I see this as three problems.

Do you mean full four-level page tables, or just fixing the quirks
in the current implementation that has an empty PUD level (and seems
to have caused a slight drop in performance for reasons that are not
yet completely understood)?

>Right now, neither the quicklists nor slabs are node local. I think
>that is a larger issue. I will start a seperate discussion about node
>locality soon.

Making the slab node aware is probably the right thing to do, but
making quicklists node aware is less invasive.

-Tony