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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-11-17 14:39:26 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-12-05 17:58:26 -0800 |
| commit | 6b50e119c440b7532ed749b635a58b3839f62992 (patch) | |
| tree | 17dbb74f3ff6e9c4a595992f8262f757e65369d1 /kernel/rcu | |
| parent | 18aff33e7314253b9437234bd6d69ddc4827de70 (diff) | |
| download | lwn-6b50e119c440b7532ed749b635a58b3839f62992.tar.gz lwn-6b50e119c440b7532ed749b635a58b3839f62992.zip | |
rcutorture: Print symbolic name for ->gp_state
Currently, ->gp_state is printed as an integer, which slows debugging.
This commit therefore prints a symbolic name in addition to the integer.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Updated to fix relational operator called out by Dan Carpenter. ]
[ paulmck: More "const", as suggested by Josh Triplett. ]
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 15 | ||||
| -rw-r--r-- | kernel/rcu/tree.h | 12 |
2 files changed, 25 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 7b78c88e19a3..316354109734 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1187,6 +1187,16 @@ static void record_gp_stall_check_time(struct rcu_state *rsp) } /* + * Convert a ->gp_state value to a character string. + */ +static const char *gp_state_getname(short gs) +{ + if (gs < 0 || gs >= ARRAY_SIZE(gp_state_names)) + return "???"; + return gp_state_names[gs]; +} + +/* * Complain about starvation of grace-period kthread. */ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp) @@ -1197,10 +1207,11 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp) j = jiffies; gpa = READ_ONCE(rsp->gp_activity); if (j - gpa > 2 * HZ) { - pr_err("%s kthread starved for %ld jiffies! g%lu c%lu f%#x s%d ->state=%#lx\n", + pr_err("%s kthread starved for %ld jiffies! g%lu c%lu f%#x %s(%d) ->state=%#lx\n", rsp->name, j - gpa, rsp->gpnum, rsp->completed, - rsp->gp_flags, rsp->gp_state, + rsp->gp_flags, + gp_state_getname(rsp->gp_state), rsp->gp_state, rsp->gp_kthread ? rsp->gp_kthread->state : ~0); if (rsp->gp_kthread) sched_show_task(rsp->gp_kthread); diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index f32bebb6bc90..a3fb6fe94127 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -545,6 +545,18 @@ struct rcu_state { #define RCU_GP_CLEANUP 5 /* Grace-period cleanup started. */ #define RCU_GP_CLEANED 6 /* Grace-period cleanup complete. */ +#ifndef RCU_TREE_NONCORE +static const char * const gp_state_names[] = { + "RCU_GP_IDLE", + "RCU_GP_WAIT_GPS", + "RCU_GP_DONE_GPS", + "RCU_GP_WAIT_FQS", + "RCU_GP_DOING_FQS", + "RCU_GP_CLEANUP", + "RCU_GP_CLEANED", +}; +#endif /* #ifndef RCU_TREE_NONCORE */ + extern struct list_head rcu_struct_flavors; /* Sequence through rcu_state structures for each RCU flavor. */ |