linux-kernel - Re: Question about sched

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Message-ID: <20190501151655.51469a4c@gandalf.local.home>
Date:   Wed, 1 May 2019 15:16:55 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, andrea.parri@...rulasolutions.com
Subject: Re: Question about sched_setaffinity()

On Wed, 1 May 2019 12:12:13 -0700
"Paul E. McKenney" <paulmck@...ux.ibm.com> wrote:


> OK, what I did was to apply the patch at the end of this email to -rcu
> branch dev, then run rcutorture as follows:
> 
> nohup tools/testing/selftests/rcutorture/bin/kvm.sh --cpus 8 --duration 2 --configs "TRIVIAL" --bootargs "trace_event=sched:sched_switch,sched:sched_wakeup ftrace=function_graph ftrace_graph_filter=sched_setaffinity,migration_cpu_stop"
> 
> This resulted in the console output that I placed here:
> 
> http://www2.rdrop.com/~paulmck/submission/console.log.gz
> 
> But I don't see calls to sched_setaffinity() or migration_cpu_stop().
> Steve, is something else needed on the kernel command line in addition to
> the following?
> 
> ftrace=function_graph ftrace_graph_filter=sched_setaffinity,migration_cpu_stop

Do you have function graph enabled in the config?

[    2.098303] ftrace bootup tracer 'function_graph' not registered.


-- Steve