diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-12-08 09:57:48 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-01-06 11:05:25 -0800 |
| commit | fc908ed33e7c1428f799abb12399f906da03b397 (patch) | |
| tree | 329342ea2dd85f88d6dae001790d5912342fd005 /kernel/rcu/tree.c | |
| parent | e9408e4f278875aa5862560b4b425b27dfcb643f (diff) | |
| download | lwn-fc908ed33e7c1428f799abb12399f906da03b397.tar.gz lwn-fc908ed33e7c1428f799abb12399f906da03b397.zip | |
rcu: Make RCU_CPU_STALL_INFO include number of fqs attempts
One way that an RCU CPU stall warning can happen is if the grace-period
kthread is not allowed to execute. One proxy for this kthread's
forward progress is the number of force-quiescent-state (fqs) scans.
This commit therefore adds the number of fqs scans to the RCU CPU stall
warning printouts when CONFIG_RCU_CPU_STALL_INFO=y.
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 4c106fcc0d54..654b15be1e36 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1043,6 +1043,7 @@ static void record_gp_stall_check_time(struct rcu_state *rsp) j1 = rcu_jiffies_till_stall_check(); ACCESS_ONCE(rsp->jiffies_stall) = j + j1; rsp->jiffies_resched = j + j1 / 2; + rsp->n_force_qs_gpstart = ACCESS_ONCE(rsp->n_force_qs); } /* |