From: Peter Zijlstra <peterz@infradead.org>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: axboe@kernel.dk, "Alasdair G. Kergon" <agk@redhat.com>,
dm-devel@redhat.com, linux-kernel@vger.kernel.org,
"Paul E. McKenney" <paulmck@us.ibm.com>
Subject: Re: [PATCH] backing-dev: use synchronize_rcu_expedited instead of synchronize_rcu
Date: Thu, 02 Feb 2012 22:59:04 +0100 [thread overview]
Message-ID: <1328219944.2446.277.camel@twins> (raw)
In-Reply-To: <Pine.LNX.4.64.1202021538570.9035@hs20-bc2-1.build.redhat.com>
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.
next prev parent reply other threads:[~2012-02-02 21:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-21 0:29 [PATCH] backing-dev: use synchronize_rcu_expedited instead of synchronize_rcu Mikulas Patocka
2011-07-21 7:27 ` Jens Axboe
2012-01-31 20:34 ` Peter Zijlstra
2012-01-31 21:04 ` Paul E. McKenney
2012-02-02 20:43 ` Mikulas Patocka
2012-02-02 21:59 ` Peter Zijlstra [this message]
2012-02-03 0:29 ` Paul E. McKenney
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