linux-kernel - Re: [PATCH 08/17] blkcg: shoot down blkio

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Date:	Mon, 23 Jan 2012 16:03:27 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Lennart Poettering <mzxreary@...inter.de>, axboe@...nel.dk,
	ctalbott@...gle.com, rni@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/17] blkcg: shoot down blkio_groups on elevator switch

On Mon, Jan 23, 2012 at 12:47:57PM -0800, Tejun Heo wrote:
> Hello, Lennart.
> 
> On Mon, Jan 23, 2012 at 09:43:52PM +0100, Lennart Poettering wrote:
> > I didn't really follow the whole discussion here, but if this is about
> > adjusting parameters of a block device as the block device shows up this
> > must necessarily happen in an udev rule (and not in a daemon watching
> > block devices using libudev), since you most likely need the
> > synchronicity: i.e. you want to avoid that normal (libudev-using)
> > userspace code ever sees the device before those params are written to
> > the device. A daemon asynchronously watching the devices with libudev
> > for adjusting such tunables is necessarily racy.
> 
> Yeap, this needs to be synchronous so that it's configured before the
> rest of system notices the device.  Vivek, can you please ask the
> tuned guys to take a look?

Sure I will. Thanks.

Vivek
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