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Date: Tue, 3 Jul 2012 05:07:13 -0300 From: Marcelo Tosatti <mtosatti@...hat.com> To: "Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com> Cc: peterz@...radead.org, mingo@...e.hu, avi@...hat.com, raghukt@...ux.vnet.ibm.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org, jeremy@...p.org, vatsa@...ux.vnet.ibm.com, hpa@...or.com Subject: Re: [PATCH v2 5/7] KVM: Introduce PV kick in flush tlb On Mon, Jun 04, 2012 at 10:38:17AM +0530, Nikunj A. Dadhania wrote: > In place of looping continuously introduce a halt if we do not succeed > after some time. > > For vcpus that were running an IPI is sent. In case, it went to sleep > between this, we will be doing flush_on_enter(harmless). But as a > flush IPI was already sent, that will be processed in ipi handler, > this might result into something undesireable, i.e. It might clear the > flush_mask of a new request. > > So after sending an IPI and waiting for a while, do a halt and wait > for a kick from the last vcpu. > > Signed-off-by: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com> > Signed-off-by: Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com> Again, was it determined that this is necessary from data of benchmarking on the in-guest-mode/out-guest-mode patch? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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