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

From: Suzuki K Poulose
Subject: Re: [Qemu-devel] [RFC PATCH v2 2/3] utils: Add cpuinfo helper to fetch /proc/cpuinfo
Date: Mon, 11 Apr 2016 10:37:12 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

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.

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 
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 ?


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