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

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Message-ID: <20130506160006.GA11731@redhat.com>
Date:	Mon, 6 May 2013 12:00:06 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
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 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].

Thanks
Vivek
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