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rcu: Dump ftrace buffer when kicking grace-period kthread

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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>
This commit is contained in:
Paul E. McKenney 2016-02-17 11:54:28 -08:00
parent 293e2421fe
commit 5dffed1e57
1 changed files with 1 additions and 0 deletions
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1
kernel/rcu/tree.c
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@ -1266,6 +1266,7 @@ static void rcu_stall_kick_kthreads(struct rcu_state *rsp)
j = READ_ONCE(rsp->jiffies_kick_kthreads); j = READ_ONCE(rsp->jiffies_kick_kthreads);
if (time_after(jiffies, j) && rsp->gp_kthread) { if (time_after(jiffies, j) && rsp->gp_kthread) {
WARN_ONCE(1, "Kicking %s grace-period kthread\n", rsp->name); WARN_ONCE(1, "Kicking %s grace-period kthread\n", rsp->name);
rcu_ftrace_dump(DUMP_ALL);
wake_up_process(rsp->gp_kthread); wake_up_process(rsp->gp_kthread);
WRITE_ONCE(rsp->jiffies_kick_kthreads, j + HZ); WRITE_ONCE(rsp->jiffies_kick_kthreads, j + HZ);
} }