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rcu: Add a trace event for synchronize_rcu_normal()

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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>
This commit is contained in:
Uladzislau Rezki (Sony) 2024-03-08 18:34:06 +01:00
parent 988f569ae0
commit 2053937a31
2 changed files with 33 additions and 1 deletions
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27
include/trace/events/rcu.h
View File

@ -707,6 +707,33 @@ TRACE_EVENT_RCU(rcu_invoke_kfree_bulk_callback,
__entry->rcuname, __entry->p, __entry->nr_records)
);
/*
* Tracepoint for a normal synchronize_rcu() states. The first argument
* is the RCU flavor, the second argument is a pointer to rcu_head the
* last one is an event.
*/
TRACE_EVENT_RCU(rcu_sr_normal,
TP_PROTO(const char *rcuname, struct rcu_head *rhp, const char *srevent),
TP_ARGS(rcuname, rhp, srevent),
TP_STRUCT__entry(
__field(const char *, rcuname)
__field(void *, rhp)
__field(const char *, srevent)
),
TP_fast_assign(
__entry->rcuname = rcuname;
__entry->rhp = rhp;
__entry->srevent = srevent;
),
TP_printk("%s rhp=0x%p event=%s",
__entry->rcuname, __entry->rhp, __entry->srevent)
);
/*
* Tracepoint for exiting rcu_do_batch after RCU callbacks have been
* invoked. The first argument is the name of the RCU flavor,

7
kernel/rcu/tree.c
View File

@ -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"));
}
/**