Re: [RFC] Protect larger order pages from breaking up

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On Fri, Feb 09, 2018 at 01:24:41PM -0600, Christopher Lameter wrote:
> Control over this feature is by writing to /proc/zoneinfo.
> 
> F.e. to ensure that 2000 16K pages stay available for jumbo
> frames do
> 
> 	echo "3=2000" >/proc/zoneinfo

That seems ... wrong.  4k is order 0, 8k is order 1, 16k is order 2,
32k is order 3.

> One can then also f.e. operate the slub allocator with
> 64k pages. Specify "slub_max_order=3 slub_min_order=3" on
> the kernel command line and all slab allocator allocations
> will occur in 16K page sizes.

This example also reads weird ;-)

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