linux-kernel - Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v5)

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Message-ID: <480CCEB0.8040401@zytor.com>
Date:	Mon, 21 Apr 2008 13:28:16 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Pavel Machek <pavel@....cz>
CC:	Mathieu Desnoyers <compudj@...stal.dyndns.org>, mingo@...e.hu,
	akpm@...l.org, Jeremy Fitzhardinge <jeremy@...p.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v5)

Pavel Machek wrote:
> 
>> There is also the page fault case. I think putting this test in
>> ret_from_exception would be both safe (it is executed for any
>> exception return) and fast (exceptions are rare).
> 
> Eh? I thought that page fault is one of the hottest paths in kernel
> (along with syscall and packet receive/send)...
> 								Pavel

Yeah, and the concept of handling page faults inside an NMI handler is 
pure fantasy.

	-hpa
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