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

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Date:   Wed, 5 May 2021 11:09:32 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     Len Brown <lenb@...nel.org>
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 Tue, May 04, 2021 at 06:56:00PM -0400, Len Brown wrote:
> 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.
>
Okay. BTW it looks like the following patch has already fixed the _CST format issue
and single tab still works:
commit fecb3bc839df64761cc63c9ee9b45c1cad36aee8
Author: David Arcari <darcari@...hat.com>
Date:   Mon Aug 10 10:43:30 2020 -0400

    tools/power turbostat: Fix output formatting for ACPI CST enumeration

thanks,
Chenyu