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Re: [Xen-devel] [PATCH] Fix clock_gettime to increment monotonically onP
| To: | John Levon <levon@xxxxxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] Fix clock_gettime to increment monotonically onPV-domain/x86 |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Fri, 15 Jun 2007 13:59:36 +0100 |
| Cc: | Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir@xxxxxxxxxxxxx> |
| Delivery-date: | Fri, 15 Jun 2007 05:55:13 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] Fix clock_gettime to increment monotonically onPV-domain/x86 |
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On 15/6/07 13:47, "John Levon" <levon@xxxxxxxxxxxxxxxxx> wrote: > On Fri, Jun 15, 2007 at 01:12:21PM +0200, Jan Beulich wrote: > >> An alternative to a spin lock would be to use a 64-bit variable storing the >> raw >> nanosecond value, and use cmpxchg to check/update it. I did it this way for >> the clocksource monotonicity: > > This is essentially what we've got now in Solaris. It seems like a > terrible shame not to just fix it in Xen, especially given all that > traffic from all CPUs to 'last_ret'. How would we fix it in Xen in a way that is faster and more scalable? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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