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| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-10-15 10:00:58 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-11-12 09:03:59 -0800 |
| commit | 0a89e5a402e957a97129423599a6ef6342da2764 (patch) | |
| tree | d8cffaa374dcd257b75615d75b95abd140ffb2f5 /kernel/rcu | |
| parent | 2320bda26df75c02f86c9fa42c3355ebcd16d8ed (diff) | |
| download | linux-stable-0a89e5a402e957a97129423599a6ef6342da2764.tar.gz linux-stable-0a89e5a402e957a97129423599a6ef6342da2764.tar.bz2 linux-stable-0a89e5a402e957a97129423599a6ef6342da2764.zip | |
rcu: Trace end of grace period before end of grace period
Currently, rcu_gp_cleanup() traces the end of the old grace period after
the old grace period has officially ended. This might make intuitive
sense, but it also makes for confusing event-trace output because the
"end" trace displays not the old but instead the new grace-period number.
This commit therefore traces the end of an old grace period just before
that grace period officially ends.
Reported-by: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 429a46fb087a..61bae41b1afe 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2035,9 +2035,9 @@ static void rcu_gp_cleanup(void) rnp = rcu_get_root(); raw_spin_lock_irq_rcu_node(rnp); /* GP before ->gp_seq update. */ - /* Declare grace period done. */ - rcu_seq_end(&rcu_state.gp_seq); + /* Declare grace period done, trace first to use old GP number. */ trace_rcu_grace_period(rcu_state.name, rcu_state.gp_seq, TPS("end")); + rcu_seq_end(&rcu_state.gp_seq); rcu_state.gp_state = RCU_GP_IDLE; /* Check for GP requests since above loop. */ rdp = this_cpu_ptr(&rcu_data); |