linux-kernel - Re: Question about sched

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Message-Id: <20190512003915.GD3923@linux.ibm.com>
Date:   Sat, 11 May 2019 17:39:15 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     Andrea Parri <andrea.parri@...rulasolutions.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Morten Rasmussen <morten.rasmussen@....com>, joelaf@...gle.com,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: Question about sched_setaffinity()

On Sat, May 11, 2019 at 11:45:20PM +0200, Andrea Parri wrote:
> > > The below trace explain the issue. Some Paul person did it, see below.
> > > It's broken per construction :-)
> > 
> > *facepalm*  Hence the very strange ->cpus_allowed mask.  I really
> > should have figured that one out.
> > 
> > The fix is straightforward.  I just added "rcutorture.shuffle_interval=0"
> > to the TRIVIAL.boot file, which stops rcutorture from shuffling its
> > kthreads around.
> 
> I added the option to the file and I didn't reproduce the issue.

Thank you!  May I add your Tested-by?

							Thanx, Paul

> > Please accept my apologies for the hassle, and thank you for tracking
> > this down!!!
> 
> Peter (echoing Paul):  Thank you for pointing that shuffler out!
> 
>   Andrea
>