[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v2 2/2] x86/xen: allow privcmd hypercalls to be preempted
On Thu, Dec 11, 2014 at 10:47:44AM -0800, H. Peter Anvin wrote: > On 12/10/2014 05:03 PM, Luis R. Rodriguez wrote: > > > > This is an issue onloy for for non*-preemptive kernels. > > > > Some of Xen's hypercalls can take a long time and unfortunately for > > *non*-preemptive kernels this can be quite a bit of an issue. > > We've handled situations like this with cond_resched() before which will > > push even *non*-preemptive kernels to behave as voluntarily preemptive, > > I was not aware to what extent this was done and precedents set but > > its pretety widespread now... this then just addresses once particular > > case where this is also an issuefor but now in IRQ context. > > > > I agree its a hack but so are all the other cond_reshed() calls then. > > I don't think its a good idea to be spreading use of something like > > this everywhere but after careful review and trying toa void this > > exact code for a while I have not been able to find any other reasonable > > alternative. > > > > This sounds like a patch that is completely unrelated to the rest of the > patch. If you mean architecture and design then yes however this patch tries to look for a resolution with the existing architecture. Luis _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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