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Re: [Xen-devel] Re: [PATCH] Require that xenstored writes to a domain co
| To: | John Levon <levon@xxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Re: [PATCH] Require that xenstored writes to a domain complete in a single chunk |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Mon, 26 Feb 2007 23:12:47 +0000 |
| Cc: | David Edmondson <dme@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 26 Feb 2007 15:11:58 -0800 |
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| Thread-topic: | [Xen-devel] Re: [PATCH] Require that xenstored writes to a domain complete in a single chunk |
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On 26/2/07 19:09, "John Levon" <levon@xxxxxxxxxxxxxxxxx> wrote: >> The Linux suspend thread does not sync with the xenbus reader thread at all. >> I'm not sure why we've never seen any problems on Linux, but I guess it's >> rare that a message cannot be sent all in one go. Especially a watch event, >> as those are usually fairly short. > > Presumably we have to make sure we've waited for all threads waiting for > a response to have woken up from the sleep-until-reply too, though; I'm > not sure we do that. Request-response pairs are serialised on a mutex. This mutex is locked out across save/restore, which means that save/restore cannot proceed until any outstanding response has been fully received. There's nothing even halfway tricky going on here. :-) -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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