On Mon, Feb 20, 2006 at 01:21:27PM -0800, Badari Pulavarty wrote:
> Hi,
>
> Following patches add support to map multiple blocks in ->get_block().
> This is will allow us to handle mapping of multiple disk blocks for
> mpage_readpages() and mpage_writepages() etc. Instead of adding new
> argument, I use "b_size" to indicate the amount of disk mapping needed
> for get_block(). And also, on success get_block() actually indicates
> the amount of disk mapping it did.
>
> Now that get_block() can handle multiple blocks, there is no need
> for ->get_blocks() which was added for DIO.
>
> [PATCH 1/3] pass b_size to ->get_block()
>
> [PATCH 2/3] map multiple blocks for mpage_readpages()
>
> [PATCH 3/3] remove ->get_blocks() support
>
> I noticed decent improvements (reduced sys time) on JFS, XFS and ext3.
> (on simple "dd" read tests).
>
> (rc3.mm1) (rc3.mm1 + patches)
> real 0m18.814s 0m18.482s
> user 0m0.000s 0m0.004s
> sys 0m3.240s 0m2.912s
>
> Andrew, Could you include it in -mm tree ?
Thanks Badari, with that interface changes the mpage_readpage changes
look a lot nicer than my original version. I'd like to second
the request to put it into -mm.
And if the namesys folks could try out whether this works for their
reiser4 requirements it'd be nice. If you have an even faster
->readpages I'd be interested in that secrete souce receipe for
further improvement to mpage_readpages.
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