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

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Message-ID: <48121F43.3060902@goop.org>
Date:	Fri, 25 Apr 2008 11:13:23 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	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>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [PATCH 1/1] x86: fix text_poke

Linus Torvalds wrote:
> With each invocation being thousands of instructions and a cross-CPU IPI 
> for the tlb flush, that kind of stuff adds up. We're likely talking real 
> fractions of a second, rather than milliseconds.

Doesn't vunmap batch the cross-CPU tlb flushes to amortize the cost?  
Hm, no, it doesn't seem to.  Oh, right, it was one of Nick's TBDs.

    J
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