Re: [RFC 2.6.11-rc2-mm2 7/7] mm: manual page migration -- sys_page_migrate

Martin J. Bligh
2005-02-16T16:55:21Z

--On Wednesday, February 16, 2005 17:08:33 +0100 Andi Kleen <ak@suse.de> wrote:

> On Wed, Feb 16, 2005 at 07:49:23AM -0800, Paul Jackson wrote:
>> Martin wrote:
>> > From reading the code (not actual experiments, yet), it seems like we won't
>> > even wake up the local kswapd until all the nodes are full. And ...
>>
>> Martin - is there a Cliff Notes summary you could provide of this
>> subthread you and Andi are having? I got lost somewhere along the way.
>
> I didn't really have much thread, but as far as I understood it
> Martin just wants kswapd to be a bit more aggressive in making sure
> all nodes always have local memory to allocate from.
>
> I don't see it as a pressing problem right now, but it may help
> for some memory intensive workloads a bit (see numastat numa_miss output for
> various nodes on how often a "wrong node" fallback happens)

Yeah - I think I'm just worried that people are proposing a manual rather
than automatic solution to solve fallback issues. We ought to be able
to fix that without tweaking things up the wazoo by hand.

M.