linux-ext4 - Re: [PATCH 07/34] ext2fs: add readahead method to improve scanning

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Date:	Fri, 19 Sep 2014 12:15:42 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-ext4@...r.kernel.org,
	Andreas Dilger <andreas.dilger@...el.com>
Subject: Re: [PATCH 07/34] ext2fs: add readahead method to improve scanning

On Sat, Sep 13, 2014 at 03:11:58PM -0700, Darrick J. Wong wrote:
> Frøm: Andreas Dilger <adilger@...mcloud.com>
> 
> Add a readahead method for prefetching ranges of disk blocks.  This is
> useful for inode table scanning, and other large contiguous ranges of
> blocks, and may also prove useful for random block prefetch, since it
> will allow reordering of the IO without waiting synchronously for the
> reads to complete.
> 
> It is currently using the posix_fadvise(POSIX_FADV_WILLNEED)
> interface, as this proved most efficient during our testing.
> 
> [darrick.wong@...cle.com]
> Make the arguments to the readahead function take the same ULL values
> as the other IO functions, and return an appropriate error code when
> fadvise isn't available.
> 
> v2: Plumb in test_io.c for cache readahead.
> 
> Signed-off-by: Andreas Dilger <andreas.dilger@...el.com>
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>

Thanks, applied.

					- Ted
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