linux-kernel - Re: [RFC][PATCH 0/3] big chunk memory allocator v2

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Message-Id: <20101029195900.88559162.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 29 Oct 2010 19:59:00 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andi Kleen <andi.kleen@...el.com>
Cc:	Michał Nazarewicz <m.nazarewicz@...sung.com>,
	Minchan Kim <minchan.kim@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	"fujita.tomonori@....ntt.co.jp" <fujita.tomonori@....ntt.co.jp>,
	"felipe.contreras@...il.com" <felipe.contreras@...il.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Jonathan Corbet <corbet@....net>,
	Russell King <linux@....linux.org.uk>,
	Pawel Osciak <pawel@...iak.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC][PATCH 0/3] big chunk memory allocator v2

On Fri, 29 Oct 2010 12:31:54 +0200
Andi Kleen <andi.kleen@...el.com> wrote:

> > When I was posting CMA, it had been suggested to create a new migration type
> > dedicated to contiguous allocations.  I think I already did that and thanks to
> > this new migration type we have (i) an area of memory that only accepts movable
> > and reclaimable pages and 
> 
> Aka highmem next generation :-(
> 

yes. But Nick's new shrink_slab() may be a new help even without
new zone.


> > (ii) is used only if all other (non-reserved) pages have
> > been allocated.
> 
> That will be near always the case after some uptime, as memory fills up
> with caches. Unless you do early reclaim? 
> 

memory migration always do work with alloc_page() for getting migration target
pages. So, memory will be reclaimed if filled by cache.

About my patch, I may have to prealloc all required pages before start.
But I didn't do that at this time.

Thanks,
-Kame

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