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| author | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2024-03-08 18:34:06 +0100 |
|---|---|---|
| committer | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2024-04-15 19:47:51 +0200 |
| commit | 2053937a310a3982de9d33af3db2dbd2b32b66e4 (patch) | |
| tree | 99d5a3e3ce18d386610070f29d504cb51da8f8bd /kernel/rcu/tree.c | |
| parent | rcu: Reduce synchronize_rcu() latency (diff) | |
| download | linux-2053937a310a3982de9d33af3db2dbd2b32b66e4.tar.xz linux-2053937a310a3982de9d33af3db2dbd2b32b66e4.zip | |
rcu: Add a trace event for synchronize_rcu_normal()
Add an rcu_sr_normal() trace event. It takes three arguments
first one is the name of RCU flavour, second one is a user id
which triggeres synchronize_rcu_normal() and last one is an
event.
There are two traces in the synchronize_rcu_normal(). On entry,
when a new request is registered and on exit point when request
is completed.
Please note, CONFIG_RCU_TRACE=y is required to activate traces.
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index f65255205e44..2e1c5be6d64b 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3863,9 +3863,11 @@ static void synchronize_rcu_normal(void) { struct rcu_synchronize rs; + trace_rcu_sr_normal(rcu_state.name, &rs.head, TPS("request")); + if (!READ_ONCE(rcu_normal_wake_from_gp)) { wait_rcu_gp(call_rcu_hurry); - return; + goto trace_complete_out; } init_rcu_head_on_stack(&rs.head); @@ -3886,6 +3888,9 @@ static void synchronize_rcu_normal(void) /* Now we can wait. */ wait_for_completion(&rs.completion); destroy_rcu_head_on_stack(&rs.head); + +trace_complete_out: + trace_rcu_sr_normal(rcu_state.name, &rs.head, TPS("complete")); } /** |