linux-kernel - Re: [PATCH V3 0/4] Reducing parameters of alloc

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Date:	Mon, 05 Jan 2015 17:01:12 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...e.cz>,
	Minchan Kim <minchan@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>
Subject: Re: [PATCH V3 0/4] Reducing parameters of alloc_pages* family of
 functions

On 01/05/2015 03:22 PM, Vlastimil Babka wrote:
> On 12/18/2014 10:26 PM, Andrew Morton wrote:
>> On Fri, 12 Dec 2014 17:13:21 +0100 Vlastimil Babka <vbabka@...e.cz> wrote:
>> 
>>> Vlastimil Babka (4):
>>>   mm: set page->pfmemalloc in prep_new_page()
>>>   mm, page_alloc: reduce number of alloc_pages* functions' parameters
>>>   mm: reduce try_to_compact_pages parameters
>>>   mm: microoptimize zonelist operations
>> 
>> That all looks pretty straightforward.  It would be nice to have a
>> summary of the code-size and stack-usage changes for the whole
>> patchset.
> 
> OK
> 
>> Can we move `struct alloc_context' into mm/internal.h?
> 
> Only if we moved also try_to_compact_pages() declaration from
> include/linux/compaction.h to mm/internal.h. I guess it's not a bad idea, as
> it's a MM-only function and mm/internal.h already contains compaction stuff.

Hm, nope. The !CONFIG_COMPACTION variant of try_to_compact_pages() is static
inline that returns COMPACT_CONTINUE, which is defined in compaction.h.
Another solution is to add a "forward" declaration (not actually followed later
by a full definition) of struct alloc_context into compaction.h. Seems to work
here, but I'm not sure if such thing is allowed?

>> I pity the poor schmuck who has to maintain this patchset for 2 months.
>> [2/4] already throws a large pile of rejects against page_alloc.c so
>> can you please refresh/retest/resend?
> 
> Right :)
> 
> Vlastimil
> 
> 
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