linux-kernel - Re: [PATCH v2 5/8] mm/isolation: change pageblock isolation logic to fix freepage counting bugs

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Date:	Tue, 12 Aug 2014 12:58:37 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Ritesh Harjani <ritesh.list@...il.com>,
	t.stanislaws@...sung.com, Gioh Kim <gioh.kim@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/8] mm/isolation: change pageblock isolation logic
 to fix freepage counting bugs

On 08/12/2014 08:43 AM, Minchan Kim wrote:
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -571,7 +571,7 @@ static inline int page_is_buddy(struct page *page, struct page *buddy,
>>    * -- nyc
>>    */
>>
>> -static inline void __free_one_page(struct page *page,
>> +void __free_one_page(struct page *page,
>
> no inline any more. :(

That could be hopefully done differently without killing this property.

> Personally, it is becoming increasingly clear that it would be better
> to add some hooks for isolateed pages to be sure to fix theses problems
> without adding more complicated logic.

Might be a valid argument but please do read the v1 discussions and then 
say if you still hold the opinion. Or maybe you will get a better 
picture afterwards and see a more elegant solution :)

Vlastimil
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