linux-kernel - Re: [PATCH v2 1/4] platform/x86: intel_pmc

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Date:   Tue, 30 Oct 2018 11:03:24 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        rajneesh.bhardwaj@...ux.intel.com
Cc:     Platform Driver <platform-driver-x86@...r.kernel.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>
Subject: Re: [PATCH v2 1/4] platform/x86: intel_pmc_core: Show Latency
 Tolerance info

[...]
> > > 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
> 
We get copy/paste data from some serial terminals from systems which
don't have traditional linux shell or busy box. Not sure if they can do
cat "-n" option or have this command at all. So line number helps. They
can't even store output as as file as this is RO file system.

But I am not as sticky on this.

Thanks,
Srinivas