linux-kernel - Re: [PATCH v3 17/18] x86/kvm/tsc: Drop extra barrier and use rdtsc

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Date:	Wed, 17 Jun 2015 15:31:27 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Andy Lutomirski <luto@...nel.org>, x86@...nel.org
CC:	Borislav Petkov <bp@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org, Len Brown <lenb@...nel.org>,
	Huang Rui <ray.huang@....com>,
	Denys Vlasenko <dvlasenk@...hat.com>, kvm@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>,
	Radim Krcmar <rkrcmar@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH v3 17/18] x86/kvm/tsc: Drop extra barrier and use rdtsc_ordered
 in kvmclock



On 17/06/2015 09:47, Paolo Bonzini wrote:
> 
> 
> On 17/06/2015 02:36, Andy Lutomirski wrote:
>> __pvclock_read_cycles had an unnecessary barrier.  Get rid of that
>> barrier and clean up the code by just using rdtsc_ordered().
>>
>> Cc: Paolo Bonzini <pbonzini@...hat.com>
>> Cc: Radim Krcmar <rkrcmar@...hat.com>
>> Cc: Marcelo Tosatti <mtosatti@...hat.com>
>> Cc: kvm@...r.kernel.org
>> Signed-off-by: Andy Lutomirski <luto@...nel.org>
>> ---
>>
>> I'm hoping to get an ack for this to go in through -tip.  (Arguably
>> I'm the maintainer of this code given how it's used, but I should
>> still ask for an ack.)
>>
>> arch/x86/include/asm/pvclock.h | 21 ++++++++++++---------
>>  1 file changed, 12 insertions(+), 9 deletions(-)
> 
> Can you send a URL to the rest of the series?  I've never even seen v1
> or v2 so I have no idea of what this is about.

Ah, it was sent to the KVM list, just not CCed to me. :)

Sorry, that's what you get when your unread message count does not fit
in three digits anymore.

Paolo
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