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Date: Mon, 1 Feb 2016 22:46:35 -0800 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Kefeng Wang <wangkefeng.wang@...wei.com> Cc: Davidlohr Bueso <dave@...olabs.net>, linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...hat.com, Josh Triplett <josh@...htriplett.org>, "Guohanjun (Hanjun Guo)" <guohanjun@...wei.com> Subject: Re: [PATCH v2] locktorture: Fix NULL pointer when torture_type is invalid On Mon, Feb 01, 2016 at 11:28:07AM +0800, Kefeng Wang wrote: > > > On 2016/2/1 11:02, Davidlohr Bueso wrote: > > On Mon, 01 Feb 2016, Kefeng Wang wrote: > > > >> Hi Davidlohr, > >> > [...] > >> > >> Yes, it works, but what you are doing is to revert commit a36a99618b1adb2d6ca0b7e08e3a656a04e477fe > > > > Oh, I see. I was definitely not aware of that one. > > > > [...] > > > >> And what Paul wanted is something that would print the full statistics > >> at the end regardless of the periodic statistics. > >> > >> I prefer my version 2, here is some log with my patch v2, it is keep consistent > >> with rcutorture. > >> ------------------------------------------------------- > >> -bash-4.3# insmod locktorture.ko torture_type=mutex > >> [ 190.845067] lock-torture: invalid torture type: "mutex" > >> [ 190.845748] lock-torture types: > >> [ 190.846099] lock_busted spin_lock > >> [ 190.863211] spin_lock_irq rw_lock > >> [ 190.863668] rw_lock_irq mutex_lock > >> [ 190.864049] rtmutex_lock rwsem_lock > >> [ 190.864390] percpu_rwsem_lock[ 190.864686] > >> [ 190.865662] Writes: Total: 0 Max/Min: 0/0 Fail: 0 > >> [ 190.866218] Reads : Total: 0 Max/Min: 0/0 Fail: 0 > >> [ 190.875071] mutex-torture:--- End of test: SUCCESS: nwriters_stress=0 nreaders_stress=0 stat_interval=60 verbose=1 shuffle_interval=3 stutter=5 shutdown_secs=0 onoff_interval=0 onoff_holdoff=0 > > > > How can the above be a successful run (SUCCESS string) if we didn't pass a > > valid torture_type? iow, there is no test without it. Just think of passing > > the wrong param in a userland application, 99.999% of the tools simply error > > out complaining about the bogus input. > > > > I think the right approach would be to decouple the statistics from the cleanup, > > that way we can still do the required cleanups and avoid any stats. > > Just like I mentioned before, keep consistent with rcutorture，I am happy to any > way to solve this issue, > > To Paul， what's your advice? Hmmm... If nothing happened, then I agree that it makes sense not to print any statistics. But if some testing actually was carried out, then we really need to print the statistics. Thanx, Paul > Thanks, > Kefeng > > Attached rcutorture log, > ---------------------------------------------------------- > -bash-4.3# insmod rcutorture.ko torture_type=xxx > [ 3195.103753] rcu-torture: invalid torture type: "xxx" > [ 3195.104328] rcu-torture types: > [ 3195.104610] rcu rcu_bh > [ 3195.104889] rcu_busted srcu > [ 3195.105188] srcud sched > [ 3195.105464] tasks[ 3195.105680] > [ 3196.121026] xxx-torture: rtc: (null) ver: 0 tfle: 1 rta: 0 rtaf: 0 rtf: 0 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 0 onoff: 0/0:0/0 -1,0:-1,0 0:0 (HZ=250) barrier: 0/0:0 cbflood: 0 > [ 3196.125066] xxx-torture: Reader Pipe: 0 0 0 0 0 0 0 0 0 0 0 > [ 3196.126176] xxx-torture: Reader Batch: 0 0 0 0 0 0 0 0 0 0 0 > [ 3196.128884] xxx-torture: Free-Block Circulation: 0 0 0 0 0 0 0 0 0 0 0 > [ 3196.129945] xxx-torture:--- End of test: SUCCESS: nreaders=0 nfakewriters=4 stat_interval=60 verbose=1 test_no_idle_hz=1 shuffle_interval=3 stutter=5 irqreader=1 fqs_duration=0 fqs_holdoff=0 fqs_stutter=3 test_boost=1/0 test_boost_interval=7 test_boost_duration=4 shutdown_secs=0 stall_cpu=0 stall_cpu_holdoff=10 n_barrier_cbs=0 onoff_interval=0 onoff_holdoff=0 > insmod: ERROR: could not insert module rcutorture.ko: Invalid parameters > > > -bash-4.3# insmod rcutorture.ko torture_type=rcu > [ 3205.456128] rcu-torture:--- Start of test: nreaders=1 nfakewriters=4 stat_interval=60 verbose=1 test_no_idle_hz=1 shuffle_interval=3 stutter=5 irqreader=1 fqs_duration=0 fqs_holdoff=0 fqs_stutter=3 test_boost=1/0 test_boost_interval=7 test_boost_duration=4 shutdown_secs=0 stall_cpu=0 stall_cpu_holdoff=10 n_barrier_cbs=0 onoff_interval=0 onoff_holdoff=0 > [ 3205.474983] rcu-torture: Creating rcu_torture_writer task > [ 3205.478951] rcu-torture: Creating rcu_torture_fakewriter task > [ 3205.479966] rcu-torture: rcu_torture_writer task started > [ 3205.480410] rcu-torture: Grace periods expedited from boot/sysfs for rcu, > [ 3205.480942] rcu-torture: Testing of dynamic grace-period expediting diabled. > [ 3205.482951] rcu-torture: Creating rcu_torture_fakewriter task > [ 3205.483854] rcu-torture: rcu_torture_fakewriter task started > [ 3205.491931] rcu-torture: Creating rcu_torture_fakewriter task > [ 3205.492858] rcu-torture: rcu_torture_fakewriter task started > [ 3205.493613] rcu-torture: Creating rcu_torture_fakewriter task > [ 3205.495176] rcu-torture: rcu_torture_fakewriter task started > [ 3205.499013] rcu-torture: Creating rcu_torture_reader task > [ 3205.499919] rcu-torture: rcu_torture_fakewriter task started > [ 3205.500578] rcu-torture: Creating rcu_torture_stats task > [ 3205.501297] rcu-torture: rcu_torture_reader task started > [ 3205.502903] rcu-torture: Creating torture_shuffle task > [ 3205.503797] rcu-torture: rcu_torture_stats task started > [ 3205.514980] rcu-torture: Creating torture_stutter task > [ 3205.515871] rcu-torture: torture_shuffle task started > [ 3205.520461] rcu-torture: Creating rcu_torture_cbflood task > [ 3205.521379] rcu-torture: torture_stutter task started > [ 3205.529569] rcu-torture: rcu_torture_cbflood task started > -bash-4.3# rmmod rcutorture.ko > [ 3209.438170] rcu-torture: Stopping torture_shuffle task > [ 3209.439312] rcu-torture: Stopping torture_shuffle > [ 3209.440150] rcu-torture: Stopping torture_stutter task > [ 3209.446624] rcu-torture: Stopping torture_stutter > [ 3209.447376] rcu-torture: Stopping rcu_torture_fakewriter > [ 3209.448028] rcu-torture: Stopping rcu_torture_writer task > [ 3209.448594] rcu-torture: Stopping rcu_torture_fakewriter > [ 3209.449088] rcu-torture: Stopping rcu_torture_reader > [ 3209.453865] rcu-torture: Stopping rcu_torture_fakewriter > [ 3209.454995] rcu-torture: Stopping rcu_torture_fakewriter > [ 3209.455551] rcu-torture: Stopping rcu_torture_writer > [ 3209.456288] rcu-torture: Stopping rcu_torture_reader task > [ 3209.457060] rcu-torture: Stopping rcu_torture_fakewriter task > [ 3209.457836] rcu-torture: Stopping rcu_torture_fakewriter task > [ 3209.462206] rcu-torture: Stopping rcu_torture_fakewriter task > [ 3209.463673] rcu-torture: Stopping rcu_torture_fakewriter task > [ 3209.464398] rcu-torture: Stopping rcu_torture_stats task > [ 3209.465139] rcu-torture: rtc: (null) ver: 217 tfle: 0 rta: 217 rtaf: 0 rtf: 206 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 740 onoff: 0/0:0/0 -1,0:-1,0 0:0 (HZ=250) barrier: 0/0:0 cbflood: 3 > [ 3209.469436] rcu-torture: Reader Pipe: 776988 96 0 0 0 0 0 0 0 0 0 > [ 3209.471702] rcu-torture: Reader Batch: 620212 156872 0 0 0 0 0 0 0 0 0 > [ 3209.472626] rcu-torture: Free-Block Circulation: 216 215 214 213 211 210 209 208 207 206 0 > [ 3209.473730] rcu-torture: Stopping rcu_torture_stats > [ 3209.474885] rcu-torture: Stopping rcu_torture_cbflood task > [ 3209.539215] rcu-torture: Stopping rcu_torture_cbflood > [ 3209.540049] rcu-torture: rtc: (null) ver: 217 tfle: 0 rta: 217 rtaf: 0 rtf: 206 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 740 onoff: 0/0:0/0 -1,0:-1,0 0:0 (HZ=250) barrier: 0/0:0 cbflood: 4 > [ 3209.541674] rcu-torture: Reader Pipe: 776988 96 0 0 0 0 0 0 0 0 0 > [ 3209.544527] rcu-torture: Reader Batch: 620212 156872 0 0 0 0 0 0 0 0 0 > [ 3209.545288] rcu-torture: Free-Block Circulation: 216 215 214 213 211 210 209 208 207 206 0 > [ 3209.548506] rcu-torture:--- End of test: SUCCESS: nreaders=1 nfakewriters=4 stat_interval=60 verbose=1 test_no_idle_hz=1 shuffle_interval=3 stutter=5 irqreader=1 fqs_duration=0 fqs_holdoff=0 fqs_stutter=3 test_boost=1/0 test_boost_interval=7 test_boost_duration=4 shutdown_secs=0 stall_cpu=0 stall_cpu_holdoff=10 n_barrier_cbs=0 onoff_interval=0 onoff_holdoff=0 > > > > > Thanks, > > Davidlohr > > > > . > > >
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