linux-kernel - Re: fragmentation avoidance Re: 2.6.22 -mm merge plans

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Message-Id: <20070507211327.3129.Y-GOTO@jp.fujitsu.com>
Date:	Mon, 07 May 2007 22:07:36 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	mel@...net.ie (Mel Gorman)
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, apw@...dowen.org,
	clameter@....com
Subject: Re: fragmentation avoidance Re: 2.6.22 -mm merge plans


Sorry for late response. I went on a vacation in last week.
And I'm in the mountain of a ton of unread mail now....

> > Mel's moveable-zone work.
> 
> These patches are what creates ZONE_MOVABLE. The last 6 patches should be
> collapsed into a single patch:
> 
> 	handle-kernelcore=-generic
> 
> I believe Yasunori Goto is looking at these from the perspective of memory
> hot-remove and has caught a few bugs in the past. Goto-san may be able to
> comment on whether they have been reviewed recently.

Hmm, I don't think my review is enough.
To be precise, I'm just one user/tester of ZONE_MOVABLE.
I have tried to make memory remove patches with Mel-san's
ZONE_MOVABLE patch. And the bugs are things that I found in its work.
(I'll post these patches in a few days.)

> The main complexity is in one function in patch one which determines where
> the PFN is in each node for ZONE_MOVABLE. Getting that right so that the
> requested amount of kernel memory spread as evenly as possible is just
> not straight-forward.

>From memory-hotplug view, ZONE_MOVABLE should be aligned by section
size. But MAX_ORDER alignment is enough for others...

Bye.

-- 
Yasunori Goto 


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