linux-kernel - Re: [PATCH] page-allocator: Remove dead function free_cold

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Date:	Thu, 6 Aug 2009 11:36:56 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>, LKML <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org
Subject: Re: [PATCH] page-allocator: Remove dead function free_cold_page()

2009/8/6 Andrew Morton <akpm@...ux-foundation.org>:
> On Wed, 5 Aug 2009 11:28:17 +0100 Mel Gorman <mel@....ul.ie> wrote:
>
>> The function free_cold_page() has no callers so delete it.
>>
>> Signed-off-by: Mel Gorman <mel@....ul.ie>
>> ---
>>  include/linux/gfp.h |    1 -
>>  mm/page_alloc.c     |    5 -----
>>  2 files changed, 6 deletions(-)
>>
>> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
>> index 7c777a0..c32bfa8 100644
>> --- a/include/linux/gfp.h
>> +++ b/include/linux/gfp.h
>> @@ -326,7 +326,6 @@ void free_pages_exact(void *virt, size_t size);
>>  extern void __free_pages(struct page *page, unsigned int order);
>>  extern void free_pages(unsigned long addr, unsigned int order);
>>  extern void free_hot_page(struct page *page);
>> -extern void free_cold_page(struct page *page);
>>
>>  #define __free_page(page) __free_pages((page), 0)
>>  #define free_page(addr) free_pages((addr),0)
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index d052abb..36758db 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -1065,11 +1065,6 @@ void free_hot_page(struct page *page)
>>       free_hot_cold_page(page, 0);
>>  }
>>
>> -void free_cold_page(struct page *page)
>> -{
>> -     free_hot_cold_page(page, 1);
>> -}
>> -
>>  /*
>>   * split_page takes a non-compound higher-order page, and splits it into
>>   * n (1<<order) sub-pages: page[0..n]
>
> Well I spose so.  But the function is valid and might need to be
> resurrected at any stage.  We could `#if 0' it to save a few bytes of
> text, perhaps.
>
> I wonder how many free_page() callers should really be calling
> free_cold_page().  c'mon, write a thingy to work it out ;) You can
> query a page's hotness by timing how long it takes to read all its
> cachelines.

if we decide to keep this function, I think we also need to consider
make it exporting.
Driver developers never user unexported function.

Or, Can we free_hot_page() and free_cold_page move to inlined function?
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