 Home |
About Xen.org |
Xen |
Xen Summit |
Wiki |
Mailing List |
Bug Tracker |
Xen Downloads |
xen-devel
Re: [Xen-devel] x86's context switch ordering of operations
| To: | "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] x86's context switch ordering of operations |
| From: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
| Date: | Tue, 29 Apr 2008 16:37:44 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 29 Apr 2008 08:37:46 -0700 |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxx |
| In-reply-to: | <C43CE81F.2012F%keir.fraser@xxxxxxxxxxxxx> |
| 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: | <48174124.76E4.0078.0@xxxxxxxxxx> <C43CE81F.2012F%keir.fraser@xxxxxxxxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 29.04.08 15:58 >>>
>Um, good point, I'd forgotten exactly how the code fitted together. Anyhow,
>the reason you see ctxt_switch_{from,to} happening after set_current() is
>because context_switch() and __context_switch() can actually be decoupled.
>When switching to the idle vcpu we run context_switch() but we do not run
>__context_switch().
Okay, that could be easily dealt with by doing set_current() explicitly
in the switch-to-idle case, and moving it into __context_switch() in
the other cases.
Any word on the significance of doing write_ptbase() after calling
ctxt_switch_to()?
Jan
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | Re: [Xen-devel] No noht?, Mark Williamson |
|---|---|
| Next by Date: | No test, No class, buy yourself Bacheelor/MasteerMBA/Doctoraate dip1omas, VALID in all countries dgd mdli wk2c3s2, Karina Rosales |
| Previous by Thread: | Re: [Xen-devel] x86's context switch ordering of operations, Keir Fraser |
| Next by Thread: | Re: [Xen-devel] x86's context switch ordering of operations, Keir Fraser |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
xen.org, 