Re: [PATCH v2 1/4] platform/x86: intel_pmc_core: Show Latency Tolerance info

From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: rajneesh.bhardwaj@linux.intel.com
Cc: Platform Driver <platform-driver-x86@vger.kernel.org>,
	Darren Hart <dvhart@infradead.org>,
	Andy Shevchenko <andy@infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
Subject: Re: [PATCH v2 1/4] platform/x86: intel_pmc_core: Show Latency Tolerance info
Date: Tue, 30 Oct 2018 11:30:50 +0200	[thread overview]
Message-ID: <CAHp75Vd8zUR9LYOj1X-3FgqnB_XVZD5hbA+WPN_7T_6kZBAQ5w@mail.gmail.com> (raw)
In-Reply-To: <a839e9d3-838b-0fb1-55ac-07562ec71313@linux.intel.com>

On Tue, Oct 30, 2018 at 9:25 AM Bhardwaj, Rajneesh
<rajneesh.bhardwaj@linux.intel.com> wrote:
>
> + Srinivas
>
>
> On 19-Oct-18 5:42 PM, Andy Shevchenko wrote:
> > On Sat, Oct 6, 2018 at 9:54 AM Rajneesh Bhardwaj
> > <rajneesh.bhardwaj@linux.intel.com> wrote:
> >> This adds support to show the Latency Tolerance Reporting for the IPs on
> >> the PCH as reported by the PMC. The format shown here is raw LTR data
> >> payload that can further be decoded as per the PCI specification.
> >>
> >> This also fixes some minor alignment issues in the header file by
> >> removing spaces and converting to tabs at some places.
> >>
> > I have pushed slightly modified variant of this patch to my review and
> > testing queue.
> > Though this series needs a bit more work.
>
> Thanks again for your review Andy. I see that the infradead server is
> down at the moment so i haven't seen your modifications yet.
> http://git.infradead.org/linux-platform-drivers-x86.git/shortlog/refs/heads/review-andy
> says gateway timeout.

Oops, yesterday it worked perfectly.

> > I see inconsistency now with the output with the rest of nodes there.
>
> index printing is not needed for those nodes hence i never added.
>
> > I don't care much, though some can be addressed for no regression.
> >
> > For example, index printing. Please, remove it. I completely forgot
> > about userspace powerful tools. At least two very old and nice can
> > enumerate lines for you.
> > Obviously the index printing is redundant.
>
> Index printing is required here (for LTR Show and LTR Ignore) because it
> paves an obvious and easy way for the users of this driver to know the
> IP number to be used for LTR ignore. This was specifically requested by
> some customer and Srinivas asked me to implement this so adding him for
> his inputs.

So, why it should be in kernel? When user prints this, they usually
call `cat /.../file`, right?
Is it too hard to call `cat -n /.../file` instead? The benefit of such
approach is that it's independent on the file we are printing.

(Note, `grep -n <PATTERN> /.../file` does the same`)

For more variants
https://stackoverflow.com/questions/8206370/add-numbers-to-the-beginning-of-every-line-in-a-file

> I am also planning to add some documentation for this driver later so
> please consider this in current form.

Good.

-- 
With Best Regards,
Andy Shevchenko