linux-kernel - Re: [PATCH v4 -mm] make swapin readahead skip over holes

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Date:	Wed, 25 Jan 2012 20:26:55 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mel@....ul.ie>, Adrian Drzewieki <z@...e.net>
Subject: Re: [PATCH v4 -mm] make swapin readahead skip over holes

On 01/25/2012 08:23 PM, Andrew Morton wrote:

> Just to show that I'm paying attention...
>
>> --- a/mm/swap_state.c
>> +++ b/mm/swap_state.c
>> @@ -382,25 +382,23 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
>>   struct page *swapin_readahead(swp_entry_t entry, gfp_t gfp_mask,
>>   			struct vm_area_struct *vma, unsigned long addr)
>>   {
>> -	int nr_pages;
>>   	struct page *page;
>> -	unsigned long offset;
>> -	unsigned long end_offset;
>> +	unsigned long offset = swp_offset(entry);
>> +	unsigned long start_offset, end_offset;
>> +	unsigned long mask = (1<<  page_cluster) - 1;
>
> This is broken for page_cluster>  31.  Fix:

I don't know who would want to do their swapins in chunks
of 8GB or large at a time, but still a good catch.

Want me to send in a v5, or do you prefer to merge a -fix
patch in your tree?

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