linux-kernel - Re: [PATCH v2] nohz: ensure users are aware boot CPU is not NO_HZ

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Date:	Tue, 11 Feb 2014 07:24:16 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] nohz: ensure users are aware boot CPU is not
 NO_HZ_FULL

On Mon, Feb 10, 2014 at 05:19:34PM +0100, Frederic Weisbecker wrote:
> On Thu, Feb 06, 2014 at 01:36:21PM -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>
> 
> Paul, I guess I can keep your ack on this 2nd version?

Please do!

						Thanx, Paul

> > Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> 
> Applied, thanks a lot!
> 
> > ---
> > 
> > v2: use "CPU 0" instead of "boot CPU".
> > 
> >  kernel/time/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
> > index 3ce6e8c5f3fc..f448513a45ed 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 CPUs by default (except CPU 0)"
> >         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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