permit this. (Or, more accurately, variants of RCU that do
-not- permit this know to ignore this variable.)
+n_barrier_cbs If this is nonzero, RCU barrier testing will be conducted,
+ in which case n_barrier_cbs specifies the number of
+ RCU callbacks (and corresponding kthreads) to use for
+ this testing. The value cannot be negative. If you
+ specify this to be non-zero when torture_type indicates a
+ synchronous RCU implementation (one for which a member of
+ the synchronize_rcu() rather than the call_rcu() family is
+ used -- see the documentation for torture_type below), an
+ error will be reported and no testing will be carried out.
+
nfakewriters This is the number of RCU fake writer threads to run. Fake
writer threads repeatedly use the synchronous "wait for
current readers" function of the interface selected by
The statistics output is as follows:
rcu-torture:--- Start of test: nreaders=16 nfakewriters=4 stat_interval=30 verbose=0 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
- rcu-torture: rtc: (null) ver: 155441 tfle: 0 rta: 155441 rtaf: 8884 rtf: 155440 rtmbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 3055767
+ rcu-torture: rtc: (null) ver: 155441 tfle: 0 rta: 155441 rtaf: 8884 rtf: 155440 rtmbe: 0 rtbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 3055767
rcu-torture: Reader Pipe: 727860534 34213 0 0 0 0 0 0 0 0 0
rcu-torture: Reader Batch: 727877838 17003 0 0 0 0 0 0 0 0 0
rcu-torture: Free-Block Circulation: 155440 155440 155440 155440 155440 155440 155440 155440 155440 155440 0
rcu_assign_pointer() and rcu_dereference() are not working
correctly. This value should be zero.
+o "rtbe": A non-zero value indicates that one of the rcu_barrier()
+ family of functions is not working correctly.
+
o "rtbke": rcutorture was unable to create the real-time kthreads
used to force RCU priority inversion. This value should be zero.