Re: [Ext2-devel] [RFC] Adding multiple block allocation

From: Suparna Bhattacharya
Date: Sat Apr 30 2005 - 11:04:50 EST

On Fri, Apr 29, 2005 at 04:22:59PM -0700, Mingming Cao wrote:
> On Fri, 2005-04-29 at 11:45 -0700, Badari Pulavarty wrote:
> > I touch tested your patch earlier and seems to work fine. Lets integrate
> > Mingming's getblocks() patches with this and see if we get any benifit
> > from the whole effort.
> >
> I tried Suparna's mpage_writepages_getblocks patch with my
> ext3_get_blocks patch, seems to work fine, except that still only one
> block is allocated at a time. I got a little confused....
> I did not see any delayed allocation code in your patch, I assume you
> have to update ext3_prepare_write to not call ext3_get_block, so that
> block allocation will be defered at ext3_writepages time. So without the
> delayed allocation part, the get_blocks in mpage_writepages is doing
> multiple blocks look up only, right?

That's right - so you could try it with mmapped writes (which don't
go through a prepare write) or with Badari's patch to not call
ext3_get_block in prepare write.

> Mingming
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Suparna Bhattacharya (suparna@xxxxxxxxxx)
Linux Technology Center
IBM Software Lab, India

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