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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-09-19 23:58:38 (GMT) |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-10-23 21:55:25 (GMT) |
| commit | b637a328bd4f43a0e146d1eef0142b650ba0d644 (patch) | |
| tree | f1bcf34f229b9ab62612971903ccd61d05db7aea /kernel/sched | |
| parent | 6f0c0580b70c89094b3422ba81118c7b959c7556 (diff) | |
| download | linux-fsl-qoriq-b637a328bd4f43a0e146d1eef0142b650ba0d644.tar.xz | |
rcu: Print remote CPU's stacks in stall warnings
The RCU CPU stall warnings rely on trigger_all_cpu_backtrace() to
do NMI-based dump of the stack traces of all CPUs. Unfortunately, a
number of architectures do not implement trigger_all_cpu_backtrace(), in
which case RCU falls back to just dumping the stack of the running CPU.
This is unhelpful in the case where the running CPU has detected that
some other CPU has stalled.
This commit therefore makes the running CPU dump the stacks of the
tasks running on the stalled CPUs.
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/sched')
| -rw-r--r-- | kernel/sched/core.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2d8927f..59d08fb 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -8076,3 +8076,9 @@ struct cgroup_subsys cpuacct_subsys = { .base_cftypes = files, }; #endif /* CONFIG_CGROUP_CPUACCT */ + +void dump_cpu_task(int cpu) +{ + pr_info("Task dump for CPU %d:\n", cpu); + sched_show_task(cpu_curr(cpu)); +} |