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Re: [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs u
| To: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs updating only the lower 32 bits |
| From: | Keir Fraser <keir.xen@xxxxxxxxx> |
| Date: | Fri, 15 Apr 2011 07:40:00 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx, "winston.l.wang" <winston.l.wang@xxxxxxxxx> |
| Delivery-date: | Thu, 14 Apr 2011 23:40:57 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] x86: don't write_tsc() non-zero values on CPUs updating only the lower 32 bits |
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On 14/04/2011 23:41, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote: >> Yeah, if we want to continue to try avoiding write_tsc() on >> TSC_RELIABLE >> then we should assert !TSC_RELIABLE on the write_tsc() path in >> cstate_tsc_restore(). > > Agreed. In fact, maybe it should be asserted in write_tsc? We still write_tsc on CPU physical hot-add. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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