RE: [PATCH] Convert pgtable cache to slab

From: Luck, Tony <>
Date: 2005-02-12 05:51:12
>> 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.

To unsubscribe from this list: send the line "unsubscribe linux-ia64" in
the body of a message to
More majordomo info at
Received on Fri Feb 11 13:56:19 2005

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:35 EST