linux-kernel - Re: [PATCH] backing-dev: use synchronize_rcu_expedited instead of synchronize

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Message-ID: <1328219944.2446.277.camel@twins>
Date:	Thu, 02 Feb 2012 22:59:04 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	axboe@...nel.dk, "Alasdair G. Kergon" <agk@...hat.com>,
	dm-devel@...hat.com, linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ibm.com>
Subject: Re: [PATCH] backing-dev: use synchronize_rcu_expedited instead of
 synchronize_rcu

On Thu, 2012-02-02 at 15:43 -0500, Mikulas Patocka wrote:
> Do you have some measurable use case where the user is removing block 
> devices so heavily that this causes a problem? 

Even one can be a problem, we're having people spend lots of time and
effort to reduce machine wide jitter and interference. Adding it with
such disregard isn't cool.

There's no reason a management cpu adding or removing block devices
should perturb the high-freq trading or industrial laser control running
on the other side of the machine.
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