linux-kernel - Re: [PATCH v2 7/7] mm/page_alloc: introduce post allocation processing on page allocator

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Date:	Fri, 17 Jun 2016 16:55:38 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	mgorman@...hsingularity.net, Minchan Kim <minchan@...nel.org>,
	Alexander Potapenko <glider@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Michal Hocko <mhocko@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v2 7/7] mm/page_alloc: introduce post allocation
 processing on page allocator

On Mon, Jun 06, 2016 at 05:21:45PM +0200, Vlastimil Babka wrote:
> On 05/26/2016 04:37 AM, js1304@...il.com wrote:
> >From: Joonsoo Kim <iamjoonsoo.kim@....com>
> >
> >This patch is motivated from Hugh and Vlastimil's concern [1].
> >
> >There are two ways to get freepage from the allocator. One is using
> >normal memory allocation API and the other is __isolate_free_page() which
> >is internally used for compaction and pageblock isolation. Later usage is
> >rather tricky since it doesn't do whole post allocation processing
> >done by normal API.
> >
> >One problematic thing I already know is that poisoned page would not be
> >checked if it is allocated by __isolate_free_page(). Perhaps, there would
> >be more.
> >
> >We could add more debug logic for allocated page in the future and this
> >separation would cause more problem. I'd like to fix this situation
> >at this time. Solution is simple. This patch commonize some logic
> >for newly allocated page and uses it on all sites. This will solve
> >the problem.
> >
> >[1] http://marc.info/?i=alpine.LSU.2.11.1604270029350.7066%40eggly.anvils%3E
> >
> >Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> Yes that's much better. Hopefully introducing a function call into
> prep_new_page() (or can compiler still inline it there?) doesn't
> impact the fast paths though.

Looks like it is already inlined in my build environment but I will
add inline attribute.

> 
> Acked-by: Vlastimil Babka <vbabka@...e.cz>

Thanks.