linux-kernel - Re: [PATCH] Fix WARN_ON / WARN_ON

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Date:	Tue, 03 Oct 2006 17:09:29 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org,
	leonid.i.ananiev@...el.com
Subject: Re: [PATCH] Fix WARN_ON / WARN_ON_ONCE regression

On Tue, 2006-10-03 at 17:07 -0700, Andrew Morton wrote:

> 
> Perhaps the `static int __warn_once' is getting put in the same cacheline
> as some frequently-modified thing.   Perhaps try marking that as __read_mostly?
> 

I've tried marking static int __warn_once as __read_mostly.  However, it
did not help with reducing the cache miss :(

So I would suggest reversing the "Let WARN_ON/WARN_ON_ONCE return the
condition" patch.  It has just been added 3 days ago so reversing it
should not be a problem.

Tim
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