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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-01-16 13:29:10 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-02-21 09:03:49 -0800 |
| commit | a858af2875fb291d0f4b0a4419fefbf03c2379c0 (patch) | |
| tree | 5183796cbf50ec0cd3bd5c741db15705376dacbd /kernel/rcutree.h | |
| parent | 13cfcca0e4e2d4cee1d0183c049eb34e54ac976e (diff) | |
| download | linux-a858af2875fb291d0f4b0a4419fefbf03c2379c0.tar.bz2 | |
rcu: Print scheduling-clock information on RCU CPU stall-warning messages
There have been situations where RCU CPU stall warnings were caused by
issues in scheduling-clock timer initialization. To make it easier to
track these down, this commit causes the RCU CPU stall-warning messages
to print out the number of scheduling-clock interrupts taken in the
current grace period for each stalled CPU.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree.h')
| -rw-r--r-- | kernel/rcutree.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h index 0328a537846a..e2ac8ee415bb 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -239,6 +239,12 @@ struct rcu_data { bool preemptible; /* Preemptible RCU? */ struct rcu_node *mynode; /* This CPU's leaf of hierarchy */ unsigned long grpmask; /* Mask to apply to leaf qsmask. */ +#ifdef CONFIG_RCU_CPU_STALL_INFO + unsigned long ticks_this_gp; /* The number of scheduling-clock */ + /* ticks this CPU has handled */ + /* during and after the last grace */ + /* period it is aware of. */ +#endif /* #ifdef CONFIG_RCU_CPU_STALL_INFO */ /* 2) batch handling */ /* @@ -466,5 +472,10 @@ static void __cpuinit rcu_prepare_kthreads(int cpu); static void rcu_prepare_for_idle_init(int cpu); static void rcu_cleanup_after_idle(int cpu); static void rcu_prepare_for_idle(int cpu); +static void print_cpu_stall_info_begin(void); +static void print_cpu_stall_info(struct rcu_state *rsp, int cpu); +static void print_cpu_stall_info_end(void); +static void zero_cpu_stall_ticks(struct rcu_data *rdp); +static void increment_cpu_stall_ticks(void); #endif /* #ifndef RCU_TREE_NONCORE */ |