linux-kernel - Re: [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler

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Message-ID: <87bojl463m.fsf@abhimanyu.in.ibm.com>
Date:	Thu, 12 Jul 2012 16:08:21 +0530
From:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>,
	S390 <linux-s390@...r.kernel.org>,
	Carsten Otte <cotte@...ibm.com>, KVM <kvm@...r.kernel.org>,
	chegu vinod <chegu_vinod@...com>,
	"Andrew M. Theurer" <habanero@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, X86 <x86@...nel.org>,
	Gleb Natapov <gleb@...hat.com>, linux390@...ibm.com,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>,
	Joerg Roedel <joerg.roedel@....com>,
	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>,
	Alexander Graf <agraf@...e.de>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler

On Wed, 11 Jul 2012 14:04:03 +0300, Avi Kivity <avi@...hat.com> wrote:
> 
> > So this would probably improve guests that uses cpu_relax, for example
> > stop_machine_run. I have no measurements, though.
> 
> smp_call_function() too (though that can be converted to directed yield
> too).  It seems worthwhile.
> 
With 

https://lkml.org/lkml/2012/6/26/266 in tip:x86/mm

which now uses smp_call_function_many in native_flush_tlb_others. It
will help that too.

Nikunj

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