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RE: [Xen-ia64-devel] [PATCH] per vcpu vhpt
| To: | "Isaku Yamahata" <yamahata@xxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-ia64-devel] [PATCH] per vcpu vhpt |
| From: | "Xu, Anthony" <anthony.xu@xxxxxxxxx> |
| Date: | Tue, 10 Oct 2006 09:31:26 +0800 |
| Cc: | xen-ia64-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 09 Oct 2006 18:32:07 -0700 |
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| Thread-index: | AcbrlIDCd1HAh1SsR7+vz3LYFH9DAwAdujog |
| Thread-topic: | [Xen-ia64-devel] [PATCH] per vcpu vhpt |
>> >non-current vcpu's case must be handled. >> I don't see any issue here, if we use option1, we use identity mapping >> for VHPT, and so we can use 16 MB TR mapping, of cause, 64KB VHPT is >> covered by this 16M TR. > >In fact I had such a patch for the very early version of >the pervcpu vhpt patch. >But I discarded it for some reason. I don't remember clearly why. >Probably I wanted to avoid introducing an implicit dependency >and increasing vcpu context switch overhead. As I know, IA64/LINUX is using this mechanism, the task_struct is 32k, but it uses 16M TR mapping if it is not covered 64M kernel TR. Anthony > >-- >yamahata _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ia64-devel |
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