linux-kernel - Re: PATCH] debug: add notifier chain debugging

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Message-ID: <20080822070054.5d466be9@infradead.org>
Date:	Fri, 22 Aug 2008 07:00:54 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: PATCH] debug: add notifier chain debugging

On Tue, 19 Aug 2008 21:09:32 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> 
> If we remove the first two checks then surely we can afford to add the
> remaining check unconditionally and lose the new config option and its
> ifdef.
> 

Andi told me that this notifier is a hotpath for kprobes (systemtap)
use models; at which point making this a config option makes sort of
sense to get the last bit of performance out of that. Personally I would
always want this option on for anything I run, and I suspect
(enterprise) distros will just always turn it on as well since it's a
good sanity check at low cost.

I'd be happy to lose the config (I think we have way too many unneeded
ones of those already); I'll make a patch.

-- 
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