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rcutorture: Add forward-progress checking for writer

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The rcutorture output currently does not distinguish between stalls in
the RCU implementation and stalls in the rcu_torture_writer() kthreads.
This commit therefore adds some diagnostics to help distinguish between
these two conditions, at least for the non-SRCU implementations.  (SRCU
does not provide evidence of update-side forward progress by design.)

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2014-02-19 10:51:42 -08:00
parent c9eaa447e7
commit ad0dc7f94d
3 changed files with 89 additions and 0 deletions
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19
include/linux/rcupdate.h
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@ -51,7 +51,17 @@ extern int rcu_expedited; /* for sysctl */
extern int rcutorture_runnable; /* for sysctl */
#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
enum rcutorture_type {
RCU_FLAVOR,
RCU_BH_FLAVOR,
RCU_SCHED_FLAVOR,
SRCU_FLAVOR,
INVALID_RCU_FLAVOR
};
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
unsigned long *gpnum, unsigned long *completed);
void rcutorture_record_test_transition(void);
void rcutorture_record_progress(unsigned long vernum);
void do_trace_rcu_torture_read(const char *rcutorturename,
@ -60,6 +70,15 @@ void do_trace_rcu_torture_read(const char *rcutorturename,
unsigned long c_old,
unsigned long c);
#else
static inline void rcutorture_get_gp_data(enum rcutorture_type test_type,
int *flags,
unsigned long *gpnum,
unsigned long *completed)
{
*flags = 0;
*gpnum = 0;
*completed = 0;
}
static inline void rcutorture_record_test_transition(void)
{
}