linux-kernel - Re: [PATCH 1/1] x86: fix text

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Date:	Fri, 25 Apr 2008 20:53:50 +0200
From:	Pavel Machek <pavel@....cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Slaby <jirislaby@...il.com>,
	David Miller <davem@...emloft.net>, zdenek.kabelac@...il.com,
	rjw@...k.pl, paulmck@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
	linux-ext4@...r.kernel.org, herbert@...dor.apana.org.au,
	penberg@...helsinki.fi, clameter@....com,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Andi Kleen <andi@...stfloor.org>, pageexec@...email.hu,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH 1/1] x86: fix text_poke

On Fri 2008-04-25 08:57:20, H. Peter Anvin wrote:
> Ingo Molnar wrote:
>>
>> text_poke() itself only applies/unapplies the LOCK prefix - a single byte. 
>> We shouldnt be doing that at all: the cost of LOCK is insignificant (a few 
>> cycles) and most systems are SMP anyway.
>>
>
> Alas, on older CPUs the cost of LOCK can be massive.  The question is how 
> much we really care - the embedded people (who would definitely be 
> affected) will simply build UP kernels, and this only affects booting SMP 
> kernels on UP.

Like... say distros on older hardware?
									Pavel
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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