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

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Date:	Wed, 25 Jan 2012 17:30:36 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
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 Wed, 25 Jan 2012 20:26:55 -0500
Rik van Riel <riel@...hat.com> wrote:

> 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,

Linux MM developers ;)

> but still a good catch.
> 
> Want me to send in a v5, or do you prefer to merge a -fix
> patch in your tree?

I already queued the fix, thanks.
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