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Date: Fri, 28 Sep 2012 16:13:05 +0200 From: Peter Zijlstra <peterz@...radead.org> To: habanero@...ux.vnet.ibm.com Cc: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>, Avi Kivity <avi@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Marcelo Tosatti <mtosatti@...hat.com>, Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>, Srikar <srikar@...ux.vnet.ibm.com>, "Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>, KVM <kvm@...r.kernel.org>, Jiannan Ouyang <ouyang@...pitt.edu>, chegu vinod <chegu_vinod@...com>, LKML <linux-kernel@...r.kernel.org>, Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>, Gleb Natapov <gleb@...hat.com>, Andrew Jones <drjones@...hat.com> Subject: Re: [PATCH RFC 0/2] kvm: Improving undercommit,overcommit scenarios in PLE handler On Fri, 2012-09-28 at 06:40 -0500, Andrew Theurer wrote: > It will be interesting to see how this behaves with a very high lock > activity in a guest. Once the scheduler defers preemption, is it for > a > fixed amount of time, or does it know to cut the deferral short as > soon > as the lock depth is reduced [by x]? Since the locks live in a guest/userspace, we don't even know they're held at all, let alone when state changes. Also, afaik PLE simply exits the guest whenever you do a busy-wait, there's no guarantee its due to a lock at all, we could be waiting for a 'virtual' hardware resource or whatnot. -- 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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