linux-kernel - Re: [PATCH UPDATED 15/24] cfq-iosched: enable full blkcg hierarchy support

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Message-ID: <20130108171929.GX3926@htj.dyndns.org>
Date:	Tue, 8 Jan 2013 09:19:29 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	lizefan@...wei.com, axboe@...nel.dk,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, ctalbott@...gle.com, rni@...gle.com
Subject: Re: [PATCH UPDATED 15/24] cfq-iosched: enable full blkcg hierarchy
 support

Hey, Vivek.

On Tue, Jan 08, 2013 at 09:42:40AM -0500, Vivek Goyal wrote:
> > +A has children and further distributes its 57% among the children and
> > +the implicit leaf node. The total active weight at this level is
> > +AA:500 + AB:1000 + A-leaf:750 = 2250.
> > +
> > + A-leaf    : ( 750 / 2250) * A =~ 19%
> > + AA(-leaf) : ( 500 / 2250) * A =~ 12%
> > + AB(-leaf) : (1000 / 2250) * A =~ 25%
> 
> Hi Tejun,
> 
> What does (-leaf) is supposed to signify? I can understand that A-leaf
> tells the share of A's tasks which are effectively in A-leaf group. 

It's saying that the weight for AA and AA-leaf are the same.

> Will just plain AA and AB be more clear?

I don't know, maybe.

Thanks.

-- 
tejun
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