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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-04-16 20:02:25 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-05-27 21:58:02 +0200 |
| commit | 81e701e4376232b2779f52f15e3b7413131bd8e4 (patch) | |
| tree | fd4da2e7259f5e448048c1db7f0276d87ec24ebd /kernel/rcu | |
| parent | rcu: Fix missing task information during rcu-preempt stall (diff) | |
| download | linux-81e701e4376232b2779f52f15e3b7413131bd8e4.tar.xz linux-81e701e4376232b2779f52f15e3b7413131bd8e4.zip | |
rcu: Add more debug info on "kthread starved" RCU CPU stall warnings
This commit adds grace number and command-flags information to the
"kthread starved" message that is sometimes printed out as part of
RCU CPU stall warnings. This message is caused by the corresponding
RCU grace-period kthread not having run for at least two seconds, and
this added information can be helpful when debugging.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 7d369b829598..52f064ac7b49 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1136,8 +1136,9 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp) j = jiffies; gpa = READ_ONCE(rsp->gp_activity); if (j - gpa > 2 * HZ) - pr_err("%s kthread starved for %ld jiffies!\n", - rsp->name, j - gpa); + pr_err("%s kthread starved for %ld jiffies! g%lu c%lu f%#x\n", + rsp->name, j - gpa, + rsp->gpnum, rsp->completed, rsp->gp_flags); } /* |