linux-ext4 - Re: [PATCH 1/1] x86: fix text

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Message-ID: <alpine.LFD.1.10.0804251009340.2779@woody.linux-foundation.org>
Date:	Fri, 25 Apr 2008 10:13:29 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Andi Kleen <andi@...stfloor.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>,
	pageexec@...email.hu, "H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH 1/1] x86: fix text_poke



On Fri, 25 Apr 2008, Ingo Molnar wrote:
> 
> performance i dont think we should be too worried about at this moment - 
> this code is so rarely used that it should be driven by robustness i 
> think.

That really isn't true. This isn't done just once. It's done many 
thousands of times.

I agree that it has to be robust, but if we want to make suspend/resume 
be instantaneous (and we do), performance does actually matter. Yes, this 
is probably much less of a problem than waiting for devices, and no, I 
haven't timed it, but if I counted right, we'll literally be going almost 
ten thousand of these calls over a suspend/resume cycle.

That's not "rarely used".

		Linus
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