linux-kernel - Re: [patch 20/38] Minor fault path optimization.

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Message-ID: <17970.53875.506097.699517@cargo.ozlabs.ibm.com>
Date:	Sat, 28 Apr 2007 14:49:55 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [patch 20/38] Minor fault path optimization.

Martin Schwidefsky writes:

> The minor fault path has grown a lot in terms of cycles. In particular
> the kprobes hook is very costly. Optimize the path to save a couple of
> cycles. If kprobes is enabled more than 300 cycles can be avoided if 
> kprobes_running() is false.

There's no good reason to use a notifier for page faults, since
there's only one external piece of code that wants to know about
them...

Regards,
Paul.
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