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[Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable
- To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- 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
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
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.
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