linux-kernel - Re: [PATCH 2/3] x86/vdso: Allow clock specific mult and shift values

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Message-ID: <d7fd1ac4-c0fc-7d6c-ff7d-38079e65a1f0@arm.com>
Date:   Thu, 30 May 2019 15:21:46 +0100
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Huw Davies <huw@...eweavers.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        linux kernel <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH 2/3] x86/vdso: Allow clock specific mult and shift values

Hi Huw,

On 15/04/2019 13:14, Huw Davies wrote:
> On Mon, Apr 15, 2019 at 11:15:56AM +0100, Vincenzo Frascino wrote:
>> On 15/04/2019 10:51, Thomas Gleixner wrote:
>>> On Mon, 15 Apr 2019, Huw Davies wrote:
>>>> On Sun, Apr 14, 2019 at 12:53:32PM +0200, Thomas Gleixner wrote:
>>>>> See https://lkml.kernel.org/r/alpine.DEB.2.21.1902231727060.1666@nanos.tec.linutronix.de
>>>>> for an alternate solution to this problem, which avoids this and just gives
>>>>> CLOCK_MONOTONIC_RAW a separate storage space alltogether.
>>>>
>>>> I can certainly do this for the x86 vdso.  Would that be useful or
>>>> should I wait for Vincenzo's work on the generic vdso first?
>>>
>>> Depends. If Vincenzo comes along with his new version soon, then you might
>>> get this for free :)
>>>
>>> Vincenzo, what's the state of your work?
>>>
>>
>> I am mostly done with the development, the only thing missing is the integration
>> of the generic update_vsyscall. After this is complete, I will need to do some
>> testing and extract the performance numbers.
>>
>> Considering that I will be on Easter holiday from this Wednesday till the end of
>> April, I think v6 will be ready around second week of May.
> 
> Hi Vincenzo,
> 
> Great!  In which case there's not much point in me changing the x86
> vdso---it'll just end up making more work for you.
> 
> Let me know if there's anything I can help with.
> 

I wanted to let you know that I just posted my updated patchset for unifying
vdso. I should have tested it enough (I hope :) ), but if your help offer is
still valid, and you want to give it a go, you are more than welcome.

Please let me know if you find any issue.

> Huw.
> 

-- 
Regards,
Vincenzo