linux-kernel - Re: lots of brief rcu stalls.

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Message-ID: <20131205171550.GA30002@redhat.com>
Date:	Thu, 5 Dec 2013 12:15:50 -0500
From:	Dave Jones <davej@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: lots of brief rcu stalls.

On Thu, Dec 05, 2013 at 08:49:12AM -0800, Paul E. McKenney wrote:

 > But what workload are you running that causes this?  The only way I
 > can think of to make this happen requires that you have at least one
 > CPU spending more than 21 seconds running continuously in kernel mode.
 > Is that what you are doing, or have you come up with some other creative
 > way for this to happen?  In the latter case, I would really like to know
 > about it in case it exposes yet another flaw in my RCU design.  ;-)

just the regular trinity runs, so it could be anything.
(Running a few instances of it, with a couple dozen child processes each to drive up the loadavg)

if only I had a trace or something that I could start to guess at what was happening :)

	Dave

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