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Date: Wed, 3 Oct 2012 19:59:42 +0530 From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> To: Avi Kivity <avi@...hat.com>, Peter Zijlstra <peterz@...radead.org> Cc: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.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>, "Andrew M. Theurer" <habanero@...ux.vnet.ibm.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 * Avi Kivity <avi@...hat.com> [2012-09-27 14:03:59]: > On 09/27/2012 01:23 PM, Raghavendra K T wrote: > >> [...] > > 2) looking at the result (comparing A & C) , I do feel we have > > significant in iterating over vcpus (when compared to even vmexit) > > so We still would need undercommit fix sugested by PeterZ (improving by > > 140%). ? > > Looking only at the current runqueue? My worry is that it misses a lot > of cases. Maybe try the current runqueue first and then others. > Okay. Do you mean we can have something like + if (rq->nr_running == 1 && p_rq->nr_running == 1) { + yielded = -ESRCH; + goto out_irq; + } in the Peter's patch ? ( I thought lot about && or || . Both seem to have their own cons ). But that should be only when we have short term imbalance, as PeterZ told. I am experimenting all these for V2 patch. Will come back with analysis and patch. > Or were you referring to something else? > -- 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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