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Re: [Xen-devel] Live migration fails under heavy network use
| To: | John Levon <levon@xxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Live migration fails under heavy network use |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Wed, 21 Feb 2007 07:32:10 +0000 |
| Cc: | Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 20 Feb 2007 23:31:19 -0800 |
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| Thread-topic: | [Xen-devel] Live migration fails under heavy network use |
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On 21/2/07 00:41, "John Levon" <levon@xxxxxxxxxxxxxxxxx> wrote: > On Wed, Feb 21, 2007 at 12:06:52AM +0000, Keir Fraser wrote: > >>> Urk. Checkout line 204 of privcmd.c >>> That doesn't look too 64b clean to me.... > > Hmm, I never looked at the Linux privcmd driver before. It seems like > you're prefaulting all the pages in the ioctl() in on the ioctl. > Currently on Solaris we're demand-faulting each page in the mmap() ... > > It looks like we're not checking that we ca actually map the page at the > time of the ioctl(), thus it's not ending up as marked with that bit. > > Looks like our bug... If you check then you may as well map at the same time. I think it would actually be hard to defer the mapping in a race-free manner. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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