linux-kernel - Re: [PATCH][RFC] tools/power turbostat: Fix ACPI CState format issue

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Date:   Tue, 4 May 2021 18:56:00 -0400
From:   Len Brown <lenb@...nel.org>
To:     Chen Yu <yu.c.chen@...el.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Zhang Rui <rui.zhang@...el.com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][RFC] tools/power turbostat: Fix ACPI CState format issue

On Mon, Oct 12, 2020 at 6:00 AM Chen Yu <yu.c.chen@...el.com> wrote:
>
> Currently if the system boots with BIOS _CST Cstate information
> enabled, the turbostat output would have unaligned problems:
>
> C1_ACPI C2_ACPI C3_ACPI POLL%   C1_ACPI%        C2_ACPI%        C3_ACPI%        CPU%c1
> 5       37      138     0.00    0.02    1.30    98.51   0.38    0.00    0.00    99.43
>
> The C1_ACPI% is of 8 bytes, so extend the format accordingly if the field name
> equals to/longer than 8 bytes.
>
> After the patch applied:
>
> C1_ACPI C2_ACPI C3_ACPI POLL%   C1_ACPI%        C2_ACPI%        C3_ACPI%        CPU%c1
> 2       42      96      0.00    0.12            2.60            97.09           0.60

Let's shorten the header fields so that a single tab continues to work.
this is helpful for processing turbostat output in .TSV format.

thx