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From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	torvalds@linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC][PATCH] rcu classic: new algorithm for callbacks-processing
Date: Sun, 06 Jul 2008 17:23:47 +0800	[thread overview]
Message-ID: <48708F23.2080702@cn.fujitsu.com> (raw)
In-Reply-To: <20080623091349.GK22569@linux.vnet.ibm.com>

Paul E. McKenney wrote:

> 
> You tried this without your changes and it passed, correct?
> 
> Never forget to test the base kernel.  ;-)
> 

Thanks, but I make some mistake here.

I tested the base kernel, no bug occurred.
So I try to find out bugs in my changes in 2 weeks.

I added debug codes and these codes showed all processing
are right and no callback broke its grace period
but the bug still occurred.

When I was puzzled after 2 weeks, I looked back the base
kernel that I had tested, and I found that I forget to set
CONFIG_NO_HZ=y.

Then I set CONFIG_NO_HZ=y in the base kernel, and the bug
occurred. It's exactly as the bug when my patch applied.

I have reported this bug here:
http://lkml.org/lkml/2008/7/3/24








  reply	other threads:[~2008-07-06  9:26 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-06-03  3:46 [RFC][PATCH] rcu classic: new algorithm for callbacks-processing Lai Jiangshan
2008-06-08 15:18 ` Paul E. McKenney
2008-06-23  3:25   ` Lai Jiangshan
2008-06-23  9:13     ` Paul E. McKenney
2008-07-06  9:23       ` Lai Jiangshan [this message]
2008-08-01 21:09         ` Paul E. McKenney

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