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Date: Mon, 18 Feb 2013 21:51:44 -0500
From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
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Subject: Re: [Lsf-pc] [LSF/MM TOPIC][ATTEND] a few topics I'd like to discuss
References: <CAHGf_=rb0t4gbm0Egw9D3RUuwbgL8U6hPwBwS46C27mgAvJp0g@mail.gmail.com> <20130218145018.GJ4365@suse.de>
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To: Mel Gorman <mgorman@suse.de>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>, lsf-pc@lists.linux-foundation.org, "linux-mm@kvack.org" <linux-mm@kvack.org>

>> * Hugepage migration ? Currently, hugepage is not migratable and can?t
>> use pages in ZONE_MOVABLE.  It is not happy from point of CMA/hotplug
>> view.
>>
> 
> migrate_huge_page() ?
> 
> It's also possible to allocate hugetlbfs pages in ZONE_MOVABLE but must
> be enabled via /proc/sys/vm/hugepages_treat_as_movable.

Oops. I missed that. Sorry for noise.

But but... I wonder why this knob is disabled by default. I don't think anybody
get a benefit form current default.


>> * Remove ZONE_MOVABLE ?Very long term goal. Maybe not suitable in this year.
> 
> Whatever about removing it totally I would like to see node memory hot-remove
> not depending on ZONE_MOVABLE.

Yup. I also think so. the first target is page table and icache/dcache because they
use a lot of memory. second step is to implement slab migration callback likes shrinker_slab. etc.
it is very long term story.

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