linux-kernel - Re: 2.6.25-rc4 rcupreempt.h WARNINGs while suspend/resume

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Date:	Thu, 6 Mar 2008 20:19:40 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	Jike Song <albcamus@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.25-rc4 rcupreempt.h WARNINGs while suspend/resume

On Fri, Mar 07, 2008 at 11:07:48AM +0800, Dave Young wrote:
> On Fri, Mar 7, 2008 at 12:27 AM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
> > On Thu, Mar 06, 2008 at 07:08:55PM +0800, Dave Young wrote:
> >  > My syslog became a 2G size big file yestoday due to the warnings.
> >  > How about change the WARN_ON to WARN_ON_ONCE?
> >
> >  Hello, Dave,
> >
> >  I might be convinced to make this change for 2.6.26, but the condition
> >  that the WARN_ON() is complaining about is quite serious, so I don't
> >  want to take a chance on it getting lost in the noise in the 2.6.25
> >  series.
> >
> >  Seem reasonable?
> 
> IMHO, WARN_ON_ONCE is enough for my eyes :)

I could believe that, but my experience has been that many others
need the condition to be obvious...

> >  Better yet, is there some sort of time-limited WARN_ON that kicks out
> >  a message at most once per second or some such?  Enough to definitely
> >  be noticed, but not enough to bring the machine to its knees?
> 
> Seems there's no such functions/macros, but is is really needed?

If everyone reports errors when they see isolated WARN_ON()s in their
logfiles, then no.  But...

						Thanx, Paul
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