linux-kernel - Re: [PATCH v3] Don't update group weights when on service tree.

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Message-ID: <4D822528.1040004@fusionio.com>
Date:	Thu, 17 Mar 2011 16:13:44 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Justin TerAvest <teravest@...gle.com>
CC:	"vgoyal@...hat.com" <vgoyal@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] Don't update group weights when on service tree.

On 2011-03-17 16:05, Justin TerAvest wrote:
> Version 3 is updated to apply to for-2.6.39/core.
> 
> For version 2, I took Vivek's advice and made sure we update the group
> weight from cfq_group_service_tree_add().
> 
> If a weight was updated while a group is on the service tree, the
> calculation for the total weight of the service tree can be adjusted
> improperly, which either leads to bad service tree weights, or
> potentially crashes (if total_weight becomes 0).
> 
> This patch defers updates to the weight until a group is off the service
> tree.

Thanks, applied. In the future, please remember to prefix the subject
line with the area of interest. This one should be:

cfq-iosched: bla bla bla

so that people going through the log knows what that patch is touching.
I added it for you here.

-- 
Jens Axboe

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