linux-kernel - Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

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Message-ID: <20070320192818.GA87860@muc.de>
Date:	Tue, 20 Mar 2007 20:28:18 +0100
From:	Andi Kleen <ak@....de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	David Miller <davem@...emloft.net>, mingo@...e.hu,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com,
	chrisw@...s-sol.org, anthony@...emonkey.ws, netdev@...r.kernel.org
Subject: Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

> But I was throwing that out as a long-term thing. I'm not claiming it's 
> trivial, but it should be doable.

One thing I was pondering was to replace the expensive popfs with

bt  $IF,(%rsp) 
jnc 1f 
sti
1: 

But would be mostly a P4 optimization again and I'm not 100% sure it is
worth it.

-Andi

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