linux-kernel - Re: [PATCH v6 1/2] Track hard and soft "short lockups" or "stalls."

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Date:	Thu, 11 Aug 2011 21:09:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alex Neronskiy <zakmagnus@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Don Zickus <dzickus@...hat.com>,
	Mandeep Singh Baines <msb@...omium.org>,
	Alex Neronskiy <zakmagnus@...omium.com>
Subject: Re: [PATCH v6 1/2] Track hard and soft "short lockups" or "stalls."

On Wed, 2011-08-10 at 11:02 -0700, Alex Neronskiy wrote:
> @@ -767,7 +767,23 @@ static struct ctl_table kern_table[] = {
>                 .extra1         = &zero,
>                 .extra2         = &one,
>         },
> -#endif
> +       {
> +               .procname       = "softstall_worst",
> +               .data           = &worst_softstall,
> +               .maxlen         = sizeof(unsigned long),
> +               .mode           = 0644,
> +               .proc_handler   = proc_doulongvec_minmax,
> +       },
> +#ifdef CONFIG_HARDLOCKUP_DETECTOR
> +       {
> +               .procname       = "hardstall_worst",
> +               .data           = &worst_hardstall,
> +               .maxlen         = sizeof(unsigned long),
> +               .mode           = 0644,
> +               .proc_handler   = proc_doulongvec_minmax,
> +       },
> +#endif /* CONFIG_HARDLOCKUP_DETECTOR */
> +#endif /* CONFIG_LOCKUP_DETECTOR */ 

And patch 2 does:


> +++ b/kernel/sysctl.c
> @@ -767,22 +767,6 @@ static struct ctl_table kern_table[] = {
>                 .extra1         = &zero,
>                 .extra2         = &one,
>         },
> -       {
> -               .procname       = "softstall_worst",
> -               .data           = &worst_softstall,
> -               .maxlen         = sizeof(unsigned long),
> -               .mode           = 0644,
> -               .proc_handler   = proc_doulongvec_minmax,
> -       },
> -#ifdef CONFIG_HARDLOCKUP_DETECTOR
> -       {
> -               .procname       = "hardstall_worst",
> -               .data           = &worst_hardstall,
> -               .maxlen         = sizeof(unsigned long),
> -               .mode           = 0644,
> -               .proc_handler   = proc_doulongvec_minmax,
> -       },
> -#endif /* CONFIG_HARDLOCKUP_DETECTOR */
>  #endif /* CONFIG_LOCKUP_DETECTOR */
> 

Makes one wonder wtf patch 1 exists for..
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