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Re: [Qemu-devel] [RFC PATCH v2 2/3] utils: Add cpuinfo helper to fetch /

From: Vijay Kilari
Subject: Re: [Qemu-devel] [RFC PATCH v2 2/3] utils: Add cpuinfo helper to fetch /proc/cpuinfo
Date: Wed, 13 Apr 2016 15:24:37 +0530

On Mon, Apr 11, 2016 at 3:07 PM, Suzuki K Poulose
<address@hidden> wrote:
> On 11/04/16 07:52, Vijay Kilari wrote:
>> Adding Suzuki Poulose.
>> Hi Suzuki,
>> On Fri, Apr 8, 2016 at 3:13 PM, Peter Maydell <address@hidden>
>> wrote:
>>> On 8 April 2016 at 07:21, Vijay Kilari <address@hidden> wrote:
>>>> On Thu, Apr 7, 2016 at 5:15 PM, Peter Maydell <address@hidden>
>>>> wrote:
>>>>> I'm told there are kernel patches in progress to get this sort
>>>>> of information in a maintainable way to userspace, which are
>>>>> currently somewhat stalled due to lack of anybody who wants to
>>>>> consume it. If you have a use case then you should probably
>>>>> flag it up with the kernel devs

Hi Peter,

   Looks like getting Suzuki's patches merged might take some time.
I propose to use /proc/cpuinfo for now and later I can move to using
Suzuki's way.

>>>> Can you please give references to those patches/discussion?
>>> I'm told the most recent thread is https://lkml.org/lkml/2015/10/5/517
>>> (and that most of the patches in that series have gone in, except
>>> for the last 4 or 5 which implement the ABI).
>> Can you please throw some light on what is the status of ABI to
>> read cpu information in user space.
>> I wanted to know cpu implementer, part number in QEMU utils
>> to add prefetches to speed up live migration for Thunderx platform.
> As for the patch series, except for that last 5 patches (which actually
> implements
> the ABI), the infrastructure patches have been merged in v4.4.
> We are awaiting feedback from possible consumers like toolchain (gcc,
> glibc).
> If you think this will be suitable for you, thats good to know. There is
> documentation available in the last patch in the above series. Could you
> please
> try the series (on v4.4, which would be easier, by simply picking up the
> last
> 5 patches) and let us know if that works for you ?

Hi Suzuki,

 The last 5 patches are not compiling on v4.4. Looks like your patch
series is not merged completely. Can you please
rebase your patches and let me know.

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