linux-kernel - Re: [PATCH 29.5/32] blk-throttle: add throtl

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Message-ID: <20130506183503.GA32173@mtj.dyndns.org>
Date:	Mon, 6 May 2013 11:35:03 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, lizefan@...wei.com,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org
Subject: Re: [PATCH 29.5/32] blk-throttle: add throtl_qnode for dispatch
 fairness

On Mon, May 06, 2013 at 12:00:06PM -0400, Vivek Goyal wrote:
> On Fri, May 03, 2013 at 05:50:44PM -0700, Tejun Heo wrote:
> 
> [..]
> > +	 * qnode_on_self is used when bios are directly queued to this
> > +	 * throtl_grp so that local bios compete fairly with bios
> > +	 * dispatched from children.  qnode_on_parent is used when bios are
> > +	 * dispatched from this throtl_grp into its parent and will compete
> > +	 * with the sibling qnode_on_parents and the parent's
> > +	 * qnode_on_self.
> > +	 */
> > +	struct throtl_qnode qnode_on_self;
> > +	struct throtl_qnode qnode_on_parent;
> 
> Do we need one throtl_qnode for each IO dir (read/write) so that we can
> queue up the right direction throtl_node in right sq->queued[rw].

Yes, we do.  Thanks for spotting it.  Will post an updated version soon.

-- 
tejun
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