linux-kernel - Re: [PATCH 2/4] [cleanup] mm: introduce free_pages

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Message-ID: <20100415133344.GE10966@csn.ul.ie>
Date:	Thu, 15 Apr 2010 14:33:44 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 2/4] [cleanup] mm: introduce free_pages_prepare

On Thu, Apr 15, 2010 at 07:24:05PM +0900, KOSAKI Motohiro wrote:
> This patch is used from [3/4]
> 
> ===================================
> Free_hot_cold_page() and __free_pages_ok() have very similar
> freeing preparation. This patch make consolicate it.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> ---
>  mm/page_alloc.c |   40 +++++++++++++++++++++-------------------
>  1 files changed, 21 insertions(+), 19 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 88513c0..ba9aea7 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -599,20 +599,23 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
>  	spin_unlock(&zone->lock);
>  }
>  
> -static void __free_pages_ok(struct page *page, unsigned int order)
> +static int free_pages_prepare(struct page *page, unsigned int order)
>  {

You don't appear to do anything with the return value. bool? Otherwise I
see no problems

Acked-by: Mel Gorman <mel@....ul.ie>

> -	unsigned long flags;
>  	int i;
>  	int bad = 0;
> -	int wasMlocked = __TestClearPageMlocked(page);
>  
>  	trace_mm_page_free_direct(page, order);
>  	kmemcheck_free_shadow(page, order);
>  
> -	for (i = 0 ; i < (1 << order) ; ++i)
> -		bad += free_pages_check(page + i);
> +	for (i = 0 ; i < (1 << order) ; ++i) {
> +		struct page *pg = page + i;
> +
> +		if (PageAnon(pg))
> +			pg->mapping = NULL;
> +		bad += free_pages_check(pg);
> +	}
>  	if (bad)
> -		return;
> +		return -EINVAL;
>  
>  	if (!PageHighMem(page)) {
>  		debug_check_no_locks_freed(page_address(page),PAGE_SIZE<<order);
> @@ -622,6 +625,17 @@ static void __free_pages_ok(struct page *page, unsigned int order)
>  	arch_free_page(page, order);
>  	kernel_map_pages(page, 1 << order, 0);
>  
> +	return 0;
> +}
> +
> +static void __free_pages_ok(struct page *page, unsigned int order)
> +{
> +	unsigned long flags;
> +	int wasMlocked = __TestClearPageMlocked(page);
> +
> +	if (free_pages_prepare(page, order))
> +		return;
> +
>  	local_irq_save(flags);
>  	if (unlikely(wasMlocked))
>  		free_page_mlock(page);
> @@ -1107,21 +1121,9 @@ void free_hot_cold_page(struct page *page, int cold)
>  	int migratetype;
>  	int wasMlocked = __TestClearPageMlocked(page);
>  
> -	trace_mm_page_free_direct(page, 0);
> -	kmemcheck_free_shadow(page, 0);
> -
> -	if (PageAnon(page))
> -		page->mapping = NULL;
> -	if (free_pages_check(page))
> +	if (free_pages_prepare(page, 0))
>  		return;
>  
> -	if (!PageHighMem(page)) {
> -		debug_check_no_locks_freed(page_address(page), PAGE_SIZE);
> -		debug_check_no_obj_freed(page_address(page), PAGE_SIZE);
> -	}
> -	arch_free_page(page, 0);
> -	kernel_map_pages(page, 1, 0);
> -
>  	migratetype = get_pageblock_migratetype(page);
>  	set_page_private(page, migratetype);
>  	local_irq_save(flags);
> -- 
> 1.6.5.2
> 
> 
> 

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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