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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-02-17 11:54:28 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-31 13:36:37 -0700 |
| commit | 5dffed1e5721f6deae4fd67d32386ef037c5fc56 (patch) | |
| tree | 58b771abe1f2344ac4a97454b4d405d8f7a685d7 /kernel/rcu/tree.c | |
| parent | 293e2421fe25839500207eda123cc4475f8d17b8 (diff) | |
| download | lwn-5dffed1e5721f6deae4fd67d32386ef037c5fc56.tar.gz lwn-5dffed1e5721f6deae4fd67d32386ef037c5fc56.zip | |
rcu: Dump ftrace buffer when kicking grace-period kthread
If it is necessary to kick the grace-period kthread, that is a good
time to dump the trace buffer in order to learn why kicking was needed.
This commit therefore does the dump.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index a739292be605..86edb92276d3 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1266,6 +1266,7 @@ static void rcu_stall_kick_kthreads(struct rcu_state *rsp) j = READ_ONCE(rsp->jiffies_kick_kthreads); if (time_after(jiffies, j) && rsp->gp_kthread) { WARN_ONCE(1, "Kicking %s grace-period kthread\n", rsp->name); + rcu_ftrace_dump(DUMP_ALL); wake_up_process(rsp->gp_kthread); WRITE_ONCE(rsp->jiffies_kick_kthreads, j + HZ); } |