linux-kernel - Re: [PATCH] mm: add the block to the tail of the list in expand()

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Message-ID: <55C0CBC3.2000602@intel.com>
Date:	Tue, 04 Aug 2015 07:27:15 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>, iamjoonsoo.kim@....com,
	alexander.h.duyck@...hat.com, sasha.levin@...cle.com,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: add the block to the tail of the list in expand()

On 08/03/2015 06:13 PM, Xishi Qiu wrote:
> How did you do the experiment?

I just stuck in some counters in expand() that looked to see whether the
list was empty or not when the page is added and then printed them out
occasionally.

It will be interesting to see the results both on a freshly-booted
system and one that's reached relatively steady-state and is moving
around a minimal number of pageblocks between the different types.

In any case, the end result here needs to be some indication that the
patch either helps ease fragmentation or helps performance.
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