linux-kernel - Re: [PATCH 02/10] migrate: make core migration code aware of hugepage

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Date:	Fri, 05 Apr 2013 16:41:48 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Hillf Danton <dhillf@...il.com>, linux-kernel@...r.kernel.org,
	kosaki.motohiro@...il.com
Subject: Re: [PATCH 02/10] migrate: make core migration code aware of hugepage

>>> There doesn't seem to be any caller for this function. Please move it to
>>> the patch which uses it.
>>
>> I would do like that if there's only one user of this function, but I thought
>> that it's better to separate this part as changes of common code
>> because this function is commonly used by multiple users which are added by
>> multiple patches later in this series.
> 
> Sure there is no hard rule for this. I just find it much easier to
> review if there is a caller of introduced functionality. In this
> particular case I found out only later that many migrate_pages callers
> were changed to use mograte_movable_pages and made the
> putback_movable_pages cleanup inconsistent between the two.
> 
> It would help to mention what is the planned future usage of the
> introduced function if you prefer to introduce it without users.

I strong agree with Michal.

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