linux-kernel - RE: [PATCH v2 2/2] Documentation: scheduler: ask users to set sched

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Date:   Fri, 13 Nov 2020 11:41:57 +0000
From:   "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>
To:     Valentin Schneider <valentin.schneider@....com>
CC:     "corbet@....net" <corbet@....net>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mel Gorman <mgorman@...e.de>, Adrian Freund <adrian@...und.io>
Subject: RE: [PATCH v2 2/2] Documentation: scheduler: ask users to set
 sched_debug cmdline



> -----Original Message-----
> From: Valentin Schneider [mailto:valentin.schneider@....com]
> Sent: Saturday, November 14, 2020 12:34 AM
> To: Song Bao Hua (Barry Song) <song.bao.hua@...ilicon.com>
> Cc: corbet@....net; linux-doc@...r.kernel.org; linux-kernel@...r.kernel.org;
> Linuxarm <linuxarm@...wei.com>; Ingo Molnar <mingo@...hat.com>; Peter
> Zijlstra <peterz@...radead.org>; Mel Gorman <mgorman@...e.de>; Adrian
> Freund <adrian@...und.io>
> Subject: Re: [PATCH v2 2/2] Documentation: scheduler: ask users to set
> sched_debug cmdline
> 
> 
> On 12/11/20 22:31, Barry Song wrote:
> > From: Valentin Schneider <valentin.schneider@....com>
> >
> > To print the schedule debug information, users need to set sched_debug
> > cmdline or enable it by sysfs entry.
> >
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Mel Gorman <mgorman@...e.de>
> > Cc: Adrian Freund <adrian@...und.io>
> > Signed-off-by: Valentin Schneider <valentin.schneider@....com>
> 
> FYI, forging SoB, or any 'tag' other than Suggested-by / Reported-by is
> frowned up. Now I do appreciate your effort to give me credit, but in this
> case you should've used Suggested-by.

As this part is actually your code, so I put an --author=" Valentin ..." in
git commit so that git can show you are the author. Actually I was not
sure if SoB was proper when I made it. My intention was only telling
people the code was from you :-)

> 
> Moreso, this really is a trivial change and doesn't deserve a separate
> patch, so I would say just squash that into patch 1, and add
> 
> Reviewed-by: Valentin Schneider <valentin.schneider@....com>
> 
> to it :)

Cool, thanks.

> 
> > Signed-off-by: Barry Song <song.bao.hua@...ilicon.com>
> > ---
> >  Documentation/scheduler/sched-domains.rst | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/Documentation/scheduler/sched-domains.rst
> b/Documentation/scheduler/sched-domains.rst
> > index 55983b7e1098..8582fa5e9170 100644
> > --- a/Documentation/scheduler/sched-domains.rst
> > +++ b/Documentation/scheduler/sched-domains.rst
> > @@ -74,6 +74,8 @@ for a given topology level by creating a
> sched_domain_topology_level array and
> >  calling set_sched_topology() with this array as the parameter.
> >
> >  The sched-domains debugging infrastructure can be enabled by enabling
> > -CONFIG_SCHED_DEBUG. This enables an error checking parse of the sched
> domains
> > -which should catch most possible errors (described above). It also prints out
> > -the domain structure in a visual format.
> > +CONFIG_SCHED_DEBUG and adding 'sched_debug' to your cmdline. If you
> forgot to
> > +tweak your cmdline, you can also flip the /sys/kernel/debug/sched_debug
> > +knob. This enables an error checking parse of the sched domains which
> should
> > +catch most possible errors (described above). It also prints out the domain
> > +structure in a visual format.

Thanks
Barry