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Date: Thu, 3 Sep 2015 09:31:39 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: David Matlack <dmatlack@...gle.com> Cc: Wanpeng Li <wanpeng.li@...mail.com>, kvm list <kvm@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v6 2/3] KVM: dynamic halt_poll_ns adjustment On 02/09/2015 21:23, David Matlack wrote: > > I actually wasn't thinking about vcpu->halt_poll_ns though. If > single_task_running() breaks us out of the loop we will "goto out" instead > of scheduling. My suspicion is this will cause us to loop calling > kvm_vcpu_block and starve the waiting task (at least until need_resched()), > which would break the "only hog the cpu when idle" aspect of halt-polling. That's definitely a bug, yes. Paolo -- 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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