linux-kernel - Re: [PATCH 18/25] btrfs: Use readahead_batch

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Date:   Thu, 17 Dec 2020 11:36:58 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     <linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 18/25] btrfs: Use readahead_batch_length

On 12/17/20 5:42 AM, Matthew Wilcox wrote:
> On Thu, Dec 17, 2020 at 12:12:46PM +0000, Matthew Wilcox wrote:
>> ehh ... probably an off-by-one.  Does subtracting 1 from contig_end fix it?
>> I'll spool up a test VM shortly and try it out.
> 
> Yes, this fixed it:
> 
> -               u64 contig_end = contig_start + readahead_batch_length(rac);
> +               u64 contig_end = contig_start + readahead_batch_length(rac) - 1;
> 

Yes, confirmed on my end, too.

thanks,
-- 
John Hubbard
NVIDIA