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From: David Ahern <dsahern@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: deadlock in scheduler enabling HRTICK feature
Date: Tue, 25 Jun 2013 15:20:00 -0600	[thread overview]
Message-ID: <51CA0980.8010409@gmail.com> (raw)
In-Reply-To: <20130625211713.GA18796@laptop.programming.kicks-ass.net>

On 6/25/13 3:17 PM, Peter Zijlstra wrote:
> On Tue, Jun 25, 2013 at 03:05:38PM -0600, David Ahern wrote:
>> Peter/Ingo:
>>
>> I can reliably cause a deadlock in the scheduler by enabling the HRTICK
>> feature. I first hit the problem with 2.6.27 but have been able to reproduce
>> it with newer kernels. I have not tried top of Linus' tree, so perhaps this
>> has been fixed in 3.10.
>
> Yeah, I know.. its been on the todo list forever but its never been
> important. Its disabled by default and all sched debug features are for
> those brave enough to keep the pieces ;-)
>

Not a whole to of pieces to keep.

What is the expectation that the feature provides? not a whole lot of 
documentation on it. I walked down the path wondering if it solved an 
odd problem we are seeing with the CFS in 2.6.27 kernel.

David

  reply	other threads:[~2013-06-25 21:20 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-25 21:05 David Ahern
2013-06-25 21:17 ` Peter Zijlstra
2013-06-25 21:20   ` David Ahern [this message]
2013-06-26  7:05     ` Peter Zijlstra
2013-06-26 16:46       ` David Ahern
2013-06-27 10:43         ` Peter Zijlstra
2013-06-27 10:53           ` Peter Zijlstra
2013-06-27 12:28             ` Mike Galbraith
2013-06-27 13:06             ` Ingo Molnar
2013-06-27 19:18             ` Andy Lutomirski
2013-06-27 20:37               ` Peter Zijlstra
2013-06-27 22:28           ` David Ahern
2013-06-28  9:00             ` Ingo Molnar
2013-06-28  9:18               ` Peter Zijlstra
2013-07-12 13:29                 ` [tip:sched/core] sched: Fix HRTICK tip-bot for Peter Zijlstra
2013-06-28  9:09             ` deadlock in scheduler enabling HRTICK feature Peter Zijlstra
2013-06-28 17:28               ` David Ahern

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