linux-kernel - Re: [RFC] [PATCH] cfq-iosched: add cfq group hierarchical scheduling support

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Message-ID: <AANLkTinCW-U2aOUh7yHM3mBdKAdeGiY-MvbvowFe5p-j@mail.gmail.com>
Date:	Mon, 30 Aug 2010 11:20:18 -0700
From:	Chad Talbott <ctalbott@...gle.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	Jeff Moyer <jmoyer@...hat.com>,
	Divyesh Shah <dpshah@...gle.com>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Nauman Rafique <nauman@...gle.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH] cfq-iosched: add cfq group hierarchical scheduling support

On Sun, Aug 29, 2010 at 11:50 PM, Gui Jianfeng
<guijianfeng@...fujitsu.com> wrote:
>  o Each cfq group has its own group service tree.
>  o Each cfq group contains a "group schedule entity" (gse) that
>    schedules on parent cfq group's service tree.
>  o Each cfq group contains a "queue schedule entity"(qse), it
>    represents all cfqqs located on this cfq group. It schedules
>    on this group's service tree. For the time being, root group
>    qse's weight is 1000, and subgroup qse's weight is 500.
>  o All gses and qse which belones to a same cfq group schedules
>    on the same group service tree.

Overall, I like this approach.  It's similar to what we are using with
earlier hierarchical patches.  Can you improve the naming a little
bit?  "qse" and "gse" look almost identical and breaks my brain.
Maybe "queue_entity" and "group_entity"?  If entity is to much to
type, then "item"?

Chad
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