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McKenney" To: Steven Rostedt Cc: Peter Zijlstra , linux-kernel@vger.kernel.org, andrea.parri@amarulasolutions.com Subject: Re: Question about sched_setaffinity() Reply-To: paulmck@linux.ibm.com References: <20190427180246.GA15502@linux.ibm.com> <20190430100318.GP2623@hirez.programming.kicks-ass.net> <20190430105129.GA3923@linux.ibm.com> <20190430115551.GT2623@hirez.programming.kicks-ass.net> <20190501191213.GX3923@linux.ibm.com> <20190501151655.51469a4c@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190501151655.51469a4c@gandalf.local.home> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 19050120-0040-0000-0000-000004E9BA8C X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011030; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000285; SDB=6.01197178; UDB=6.00627891; IPR=6.00978032; MB=3.00026686; MTD=3.00000008; XFM=3.00000015; UTC=2019-05-01 20:27:16 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19050120-0041-0000-0000-000008F5BED2 Message-Id: <20190501202713.GY3923@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-01_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905010126 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 01, 2019 at 03:16:55PM -0400, Steven Rostedt wrote: > On Wed, 1 May 2019 12:12:13 -0700 > "Paul E. McKenney" 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. I guess I don't! Thank you, will fix. Let's see... My .config has CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y. It looks like I need CONFIG_FUNCTION_GRAPH_TRACER=y, which I don't have. And it looks like that needs CONFIG_FUNCTION_TRACER=y, which I also don't have. But I do have CONFIG_HAVE_FUNCTION_TRACER=y. So I should add this to my rcutorture command line: --kconfig "CONFIG_FUNCTION_TRACER=y CONFIG_FUNCTION_GRAPH_TRACER=y". I fired this up. Here is hoping! ;-) And it does have sched_setaffinity(), woo-hoo!!! I overwrote the old file: http://www2.rdrop.com/~paulmck/submission/console.log.gz Thanx, Paul