linux-kernel - Re: [RFC PATCH 11/12] mm: add the PCP interface

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Message-ID: <55709C98.1030005@intel.com>
Date:	Thu, 04 Jun 2015 11:44:40 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Xishi Qiu <qiuxishi@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	nao.horiguchi@...il.com, Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu,
	Xiexiuqi <xiexiuqi@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	"Luck, Tony" <tony.luck@...el.com>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 11/12] mm: add the PCP interface

On 06/04/2015 06:04 AM, Xishi Qiu wrote:
>  	spin_lock(&zone->lock);
>  	for (i = 0; i < count; ++i) {
> -		struct page *page = __rmqueue(zone, order, migratetype);
> +		struct page *page;
> +
> +		if (is_migrate_mirror(migratetype))
> +			page = __rmqueue_smallest(zone, order, migratetype);
> +		else
> +			page = __rmqueue(zone, order, migratetype);
>  		if (unlikely(page == NULL))
>  			break;

Why is this necessary/helpful?  The changelog doesn't tell me either. :(

Why was this code modified in stead of putting the changes in
__rmqueue() itself (like CMA did)?
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