linux-kernel - Re: [PATCH] nohz: ensure users are aware boot CPU is not NO_HZ

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Date:	Tue, 28 Jan 2014 16:06:30 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] nohz: ensure users are aware boot CPU is not NO_HZ_FULL

On Tue, Jan 28, 2014 at 12:10:49PM -0500, Paul Gortmaker wrote:
> This bit of information is in the Kconfig help text:
> 
>   Note the boot CPU will still be kept outside the range to
>   handle the timekeeping duty.
> 
> However neither the variable NO_HZ_FULL_ALL, or the prompt
> convey this important detail, so lets add it to the prompt
> to make it more explicitly obvious to the average user.
> 
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>

Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

> ---
>  kernel/time/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
> index 3ce6e8c5f3fc..76a1fbef1fd8 100644
> --- a/kernel/time/Kconfig
> +++ b/kernel/time/Kconfig
> @@ -124,7 +124,7 @@ config NO_HZ_FULL
>  endchoice
> 
>  config NO_HZ_FULL_ALL
> -       bool "Full dynticks system on all CPUs by default"
> +       bool "Full dynticks system on all (but boot) CPUs by default"
>         depends on NO_HZ_FULL
>         help
>           If the user doesn't pass the nohz_full boot option to
> -- 
> 1.8.5.2
> 

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