linux-kernel - Re: [RFC 0/2] x86, vdso, pvclock: Cleanups and speedups

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Message-ID: <CALCETrUtf=a9wRYwftJxNB6Smrf0pXS43qPd37XO0_mxrGJ-Cg@mail.gmail.com>
Date:	Tue, 23 Dec 2014 00:16:55 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...nel.org>, kvm list <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	glommer@...il.com
Subject: Re: [RFC 0/2] x86, vdso, pvclock: Cleanups and speedups

On Mon, Dec 22, 2014 at 11:21 PM, Paolo Bonzini <pbonzini@...hat.com> wrote:
>
>
> On 23/12/2014 01:39, Andy Lutomirski wrote:
>> This is a dramatic simplification and speedup of the vdso pvclock read
>> code.  Is it correct?
>>
>> Andy Lutomirski (2):
>>   x86, vdso: Use asm volatile in __getcpu
>>   x86, vdso, pvclock: Simplify and speed up the vdso pvclock reader
>
> Patch 1 is ok,
>
> Acked-by: Paolo Bonzini <pbonzini@...hat.com>

Any thoughts as to whether it should be tagged for stable?  I haven't
looked closely enough at the old pvclock code or the generated code to
have much of an opinion there.  It'll be a big speedup for non-pvclock
users at least.

--Andy

>
> For patch 2 I will defer to Marcelo and Glauber (and the Xen folks).
>
> Paolo



-- 
Andy Lutomirski
AMA Capital Management, LLC
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