Re: [PATCH 13/35] autonuma: add page structure fields

Rik van Riel
2012-05-29T16:47:34Z

On 05/29/2012 12:38 PM, Andrea Arcangeli wrote:
> On Tue, May 29, 2012 at 03:16:25PM +0200, Peter Zijlstra wrote:
>> 24 bytes per page.. or ~0.6% of memory gone. This is far too great a
>> price to pay.
>
> I don't think it's too great, memcg uses for half of that and yet
> nobody is booting with cgroup_disable=memory even on not-NUMA servers
> with less RAM.

Not any more.

Ever since the memcg naturalization work by Johannes,
a page is only ever on one LRU list and the memcg
memory overhead is gone.

> But I'm all for experimenting. It's just not something I had the time
> to try yet. I will certainly love to see how it performs by reducing
> the max size of the list. I totally agree it's a good idea to try it
> out, and I don't exclude it will work fine, but it's not obvious it's
> worth the memory saving.

That's fair enough.

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