From: "Jan Beulich" <jbeulich@novell.com>
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: x86's context switch ordering of operations
Date: Tue, 29 Apr 2008 16:37:44 +0100 [thread overview]
Message-ID: <48175CE8.76E4.0078.0@novell.com> (raw)
In-Reply-To: <C43CE81F.2012F%keir.fraser@eu.citrix.com>
>>> Keir Fraser <keir.fraser@eu.citrix.com> 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
next prev parent reply other threads:[~2008-04-29 15:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-29 12:39 x86's context switch ordering of operations Jan Beulich
2008-04-29 12:50 ` Keir Fraser
2008-04-29 13:39 ` Jan Beulich
2008-04-29 13:58 ` Keir Fraser
2008-04-29 15:37 ` Jan Beulich [this message]
2008-04-29 16:52 ` Keir Fraser
2008-04-29 17:03 ` Jeremy Fitzhardinge
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