linux-kernel - Re: [PATCH RFC V9 0/19] Paravirtualized ticket spinlocks

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Message-ID: <51DD482E.30605@linux.vnet.ibm.com>
Date:	Wed, 10 Jul 2013 17:10:30 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Gleb Natapov <gleb@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
CC:	Andrew Jones <drjones@...hat.com>, mingo@...hat.com,
	ouyang@...pitt.edu, habanero@...ux.vnet.ibm.com, jeremy@...p.org,
	x86@...nel.org, konrad.wilk@...cle.com, hpa@...or.com,
	pbonzini@...hat.com, linux-doc@...r.kernel.org,
	xen-devel@...ts.xensource.com, mtosatti@...hat.com,
	stefano.stabellini@...citrix.com, andi@...stfloor.org,
	attilio.rao@...rix.com, gregkh@...e.de, agraf@...e.de,
	chegu_vinod@...com, torvalds@...ux-foundation.org,
	avi.kivity@...il.com, tglx@...utronix.de, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, riel@...hat.com,
	virtualization@...ts.linux-foundation.org,
	srivatsa.vaddagiri@...il.com
Subject: Re: [PATCH RFC V9 0/19] Paravirtualized ticket spinlocks

dropping stephen becuase of bounce

On 07/10/2013 04:58 PM, Raghavendra K T wrote:
> On 07/10/2013 04:17 PM, Gleb Natapov wrote:
>> On Wed, Jul 10, 2013 at 12:40:47PM +0200, Peter Zijlstra wrote:
>>> On Wed, Jul 10, 2013 at 01:33:25PM +0300, Gleb Natapov wrote:
>>>
>>> Here's an idea, trim the damn email ;-) -- not only directed at gleb.
>>>
>> Good idea.
>>
>>>>> Ingo, Gleb,
>>>>>
>>>>>  From the results perspective, Andrew Theurer, Vinod's test results
>>>>> are
>>>>> pro-pvspinlock.
>>>>> Could you please help me to know what will make it a mergeable
>>>>> candidate?.
>>>>>
>>>> I need to spend more time reviewing it :) The problem with PV
>>>> interfaces
>>>> is that they are easy to add but hard to get rid of if better solution
>>>> (HW or otherwise) appears.
>>>
>>> How so? Just make sure the registration for the PV interface is
>>> optional; that
>>> is, allow it to fail. A guest that fails the PV setup will either
>>> have to try
>>> another PV interface or fall back to 'native'.
>>>

Forgot to add. Yes currently pvspinlocks are not enabled by default and
also, we have jump_label mechanism to enable it.
[...]

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