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Date:   Tue, 5 Oct 2021 13:27:29 -0700
From:   Doug Smythies <dsmythies@...us.net>
To:     "Zephaniah E. Loss-Cutler-Hull" <zephaniah@...il.com>
Cc:     Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dsmythies <dsmythies@...us.net>
Subject: Re: [PATCH 1/2] tools/power turbostat: Allow -e for all names.

On Mon, Oct 4, 2021 at 9:54 PM Zephaniah E. Loss-Cutler-Hull
<zephaniah@...il.com> wrote:
>
> Currently, there are a number of variables which are displayed by
> default, enabled with -e all, and listed by --list, but which you can
> not give to --enable/-e.
>
> So you can enable CPU0c1 (in the bic array), but you can't enable C1 or
> C1% (not in the bic array, but exists in sysfs).
>
> This runs counter to both the documentation and user expectations, and
> it's just not very user friendly.
>
> As such, the mechanism used by --hide has been duplicated, and is now
> also used by --enable, so we can handle unknown names gracefully.
>
> Note: One impact of this is that truly unknown fields given to --enable
> will no longer generate errors, they will be silently ignored, as --hide
> does.
>
> Signed-off-by: Zephaniah E. Loss-Cutler-Hull <zephaniah@...il.com>

This is an incredibly useful patch. Thank you.
Tested-by and Reviewed-by: Doug Smythies <dsmythies@...us.net>

> ---
>  tools/power/x86/turbostat/turbostat.c | 49 +++++++++++++++++++--------
>  1 file changed, 35 insertions(+), 14 deletions(-)
>
> diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
> index 47d3ba895d6d..f5d634ee5fee 100644
> --- a/tools/power/x86/turbostat/turbostat.c
> +++ b/tools/power/x86/turbostat/turbostat.c
> @@ -686,7 +686,9 @@ unsigned long long bic_present = BIC_USEC | BIC_TOD | BIC_sysfs | BIC_APIC | BIC
>  #define BIC_IS_ENABLED(COUNTER_BIT) (bic_enabled & COUNTER_BIT)
>
>  #define MAX_DEFERRED 16
> +char *deferred_add_names[MAX_DEFERRED];
>  char *deferred_skip_names[MAX_DEFERRED];
> +int deferred_add_index;
>  int deferred_skip_index;
>
>  /*
> @@ -775,17 +777,23 @@ unsigned long long bic_lookup(char *name_list, enum show_hide_mode mode)
>                 }
>                 if (i == MAX_BIC) {
>                         if (mode == SHOW_LIST) {
> -                               fprintf(stderr, "Invalid counter name: %s\n", name_list);
> -                               exit(-1);
> -                       }
> -                       deferred_skip_names[deferred_skip_index++] = name_list;
> -                       if (debug)
> -                               fprintf(stderr, "deferred \"%s\"\n", name_list);
> -                       if (deferred_skip_index >= MAX_DEFERRED) {
> -                               fprintf(stderr, "More than max %d un-recognized --skip options '%s'\n",
> -                                       MAX_DEFERRED, name_list);
> -                               help();
> -                               exit(1);
> +                               deferred_add_names[deferred_add_index++] = name_list;
> +                               if (deferred_add_index >= MAX_DEFERRED) {
> +                                       fprintf(stderr, "More than max %d un-recognized --add options '%s'\n",
> +                                                       MAX_DEFERRED, name_list);
> +                                       help();
> +                                       exit(1);
> +                               }
> +                       } else {
> +                               deferred_skip_names[deferred_skip_index++] = name_list;
> +                               if (debug)
> +                                       fprintf(stderr, "deferred \"%s\"\n", name_list);
> +                               if (deferred_skip_index >= MAX_DEFERRED) {
> +                                       fprintf(stderr, "More than max %d un-recognized --skip options '%s'\n",
> +                                                       MAX_DEFERRED, name_list);
> +                                       help();
> +                                       exit(1);
> +                               }
>                         }
>                 }
>
> @@ -6138,6 +6146,16 @@ void parse_add_command(char *add_command)
>         }
>  }
>
> +int is_deferred_add(char *name)
> +{
> +       int i;
> +
> +       for (i = 0; i < deferred_add_index; ++i)
> +               if (!strcmp(name, deferred_add_names[i]))
> +                       return 1;
> +       return 0;
> +}
> +
>  int is_deferred_skip(char *name)
>  {
>         int i;
> @@ -6156,9 +6174,6 @@ void probe_sysfs(void)
>         int state;
>         char *sp;
>
> -       if (!DO_BIC(BIC_sysfs))
> -               return;
> -
>         for (state = 10; state >= 0; --state) {
>
>                 sprintf(path, "/sys/devices/system/cpu/cpu%d/cpuidle/state%d/name", base_cpu, state);
> @@ -6181,6 +6196,9 @@ void probe_sysfs(void)
>
>                 sprintf(path, "cpuidle/state%d/time", state);
>
> +               if (!DO_BIC(BIC_sysfs) && !is_deferred_add(name_buf))
> +                       continue;
> +
>                 if (is_deferred_skip(name_buf))
>                         continue;
>
> @@ -6206,6 +6224,9 @@ void probe_sysfs(void)
>
>                 sprintf(path, "cpuidle/state%d/usage", state);
>
> +               if (!DO_BIC(BIC_sysfs) && !is_deferred_add(name_buf))
> +                       continue;
> +
>                 if (is_deferred_skip(name_buf))
>                         continue;
>
> --
> 2.33.0
>

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