WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravi

To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable
From: Paul Mackerras <paulus@xxxxxxxxx>
Date: Wed, 21 Mar 2007 11:03:14 +1100
Cc: Zachary Amsden <zach@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, chrisw@xxxxxxxxxxxx, Andi Kleen <ak@xxxxxx>, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, anthony@xxxxxxxxxxxxx, mingo@xxxxxxx, David Miller <davem@xxxxxxxxxxxxx>
Delivery-date: Wed, 21 Mar 2007 02:28:18 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <Pine.LNX.4.64.0703200805450.6730@xxxxxxxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <20070316.023331.59468179.davem@xxxxxxxxxxxxx> <45FB005D.9060809@xxxxxxxx> <1174127638.8897.75.camel@xxxxxxxxxxxxxxxxxxxxx> <20070318.003309.71088169.davem@xxxxxxxxxxxxx> <20070318120814.GA45869@xxxxxx> <1174272469.11680.23.camel@xxxxxxxxxxxxxxxxxxxxx> <m1648xxf93.fsf@xxxxxxxxxxxxxxxxxxxxxxxxx> <Pine.LNX.4.64.0703191134190.6730@xxxxxxxxxxxxxxxxxxxxxxxxxx> <1174348905.11680.54.camel@xxxxxxxxxxxxxxxxxxxxx> <45FF4043.4000805@xxxxxxxxxx> <45FF770C.7050301@xxxxxxxx> <Pine.LNX.4.64.0703200805450.6730@xxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Linus Torvalds writes:

> We should just do this natively. There's been several tests over the years 
> saying that it's much more efficient to do sti/cli as a simple store, and 
> handling the "oops, we got an interrupt while interrupts were disabled" as 
> a special case.
> 
> I have this dim memory that ARM has done it that way for a long time 
> because it's so expensive to do a "real" cli/sti.
> 
> And I think -rt does it for other reasons. It's just more flexible.

64-bit powerpc does this now as well.

Paul.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>