linux-ext4 - Re: [PATCH] ext4: start seraching for the right extent from the goal group.

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Message-Id: <1209762700.3609.9.camel@localhost.localdomain>
Date:	Fri, 02 May 2008 14:11:40 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Eric Sandeen <sandeen@...hat.com>, adilger@....com,
	linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH] ext4: start seraching for the right extent from the
	goal group.

On Thu, 2008-05-01 at 21:07 +0530, Aneesh Kumar K.V wrote:
> On Wed, Apr 30, 2008 at 07:58:35AM -0500, Eric Sandeen wrote:
> > Aneesh Kumar K.V wrote:
> > > With mballoc we search for the best extent using different
> > > criteria. We should always use the goal group when we are
> > > starting with a new criteria.
> > 
> > Aneesh, is there any testcase etc that will demonstrate the resulting
> > difference in layout?
> > 
> > It's not clear to me from this changelog (without looking at a lot more
> > context) exactly what you're changing and why...
> 
> I don't have any specific test case.  With mballoc depending on the
> request size we follow different criteria to allocate blocks. For
> example if the size is stripe size multiple we use criteria 1 and start
> searching for the right blocks from block group starting with goal
> group. If we don't find right count of blocks, we use criteria 2 and start
> searching from the group block 0. I guess with criteria 2 also, we should start
> searching from the goal group so that when we find the right count of
> blocks we find them close to the goal group.
> 

Sounds reasoanble to me. I added this patch in the ext4 patch queue
> 
> -aneesh

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