From: Andy Lutomirski <luto@amacapital.net>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Roman Kagan <rkagan@virtuozzo.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
kvm list <kvm@vger.kernel.org>, Minfei Huang <mnghuan@gmail.com>,
Andrew Lutomirski <luto@kernel.org>
Subject: Re: [PATCH] pvclock: introduce seqcount-like API
Date: Thu, 9 Jun 2016 11:08:44 -0700 [thread overview]
Message-ID: <CALCETrVnN25Oza+-UQouc_pXD-W+A=d7SNLwCpih8BJxe=GL8Q@mail.gmail.com> (raw)
In-Reply-To: <3bfffd0d-bb91-d9e3-b67b-a82be9cb82d7@redhat.com>
On Thu, Jun 9, 2016 at 11:03 AM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>
>
> On 09/06/2016 19:12, Andy Lutomirski wrote:
>> On Thu, Jun 9, 2016 at 6:45 AM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>>> On 09/06/2016 15:35, Roman Kagan wrote:
>>>> On Thu, Jun 09, 2016 at 02:47:54PM +0200, Paolo Bonzini wrote:
>>>>> On 09/06/2016 14:43, Roman Kagan wrote:
>>>> Has it landed in any public tree? I'm unable to find any. There
>>>> appears to be another version of the patch on the list, so I'm confused.
>>>
>>> I'm about to push it to kvm/master.
>>
>> Sorry for being slow. I'm catching up. In its current form, I don't
>> like this patch. Please don't apply it.
>
> Sure, I was talking about Minfei's patches, not this one. :) Of course
> I need ack for this one.
>
>> The problem is that this makes two significant changes at once:
>>
>> 1. Use the new version helpers. I like that change.
>>
>> 2. Use __pvclock_read_cycles. That should be separate, and it should
>> come with timing numbers in the changelog.
>
> __pvclock_read_cycles is pretty much the same as the code that is being
> inlined. Thus the only change is that __pvclock_read_cycles is called
> inside the loop rather than outside, but the loop really is expected to
> never roll so why make a copy in the first place?
I feel like I had a reason, but I don't remember what it was.
--Andy
next prev parent reply other threads:[~2016-06-09 18:09 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-09 11:23 [PATCH] pvclock: introduce seqcount-like API Paolo Bonzini
2016-06-09 12:43 ` Roman Kagan
2016-06-09 12:47 ` Paolo Bonzini
2016-06-09 13:35 ` Roman Kagan
2016-06-09 13:45 ` Paolo Bonzini
2016-06-09 17:12 ` Andy Lutomirski
2016-06-09 18:03 ` Paolo Bonzini
2016-06-09 18:08 ` Andy Lutomirski [this message]
2016-06-15 12:17 ` Paolo Bonzini
2016-06-12 10:25 ` Minfei Huang
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