linux-kernel - Re: [PATCH 7/7] readahead: basic support of interleaved reads

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Message-ID: <20070721075744.GA10790@mail.ustc.edu.cn>
Date:	Sat, 21 Jul 2007 15:57:44 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 7/7] readahead: basic support of interleaved reads

On Sat, Jul 21, 2007 at 05:24:39PM +1000, Rusty Russell wrote:
> 	This is really clever!

Thank you :)

> 	Only one slight complaint: I wonder if "radix_tree_scan_hole" could be
> expressed as "radix_tree_extent_size" which return the number of

In fact the full context based readahead requires three functions:

        - radix_tree_scan_hole(root, index, max_scan)                                                                   
        - radix_tree_scan_hole_backward(root, index, max_scan)                                                          
        - radix_tree_scan_data_backward(root, index, max_scan)                                                          

I would be very glad if you can work up a consistent naming scheme
for them all ;)

> populated indices up to "max_scan".  Returning a length seems more
> intuitive to me (and I think gets rid of the wraparound error case?)

No, changing the return value won't eliminate the wraparound case.

But I guess we can safely assume that it won't wrap around at all?
The last page in the pagecache address space will not be
granted/allocated thanks to the not-too-aggressive MAX_LFS_FILESIZE?

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