From: Steven Rostedt <rostedt@goodmis.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
mingo@kernel.org, joel@joelfernandes.org,
gregkh@linuxfoundation.org, gustavo@embeddedor.com,
tglx@linutronix.de, paulmck@kernel.org, josh@joshtriplett.org,
mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com
Subject: Re: [PATCH 6/8] perf,tracing: Prepare the perf-trace interface for RCU changes
Date: Wed, 12 Feb 2020 09:26:55 -0500 [thread overview]
Message-ID: <20200212092655.4ba6cd79@gandalf.local.home> (raw)
In-Reply-To: <20200212094107.951346701@infradead.org>
On Wed, 12 Feb 2020 10:32:16 +0100
Peter Zijlstra <peterz@infradead.org> wrote:
> The tracepoint interface will stop providing regular RCU context; make
> sure we do it ourselves, since perf makes use of regular RCU protected
> data.
>
Suggested-by: Steven Rostedt (VMware) <rosted@goodmis.org>
;-)
-- Steve
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
> kernel/events/core.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -8950,6 +8950,7 @@ void perf_tp_event(u16 event_type, u64 c
> {
> struct perf_sample_data data;
> struct perf_event *event;
> + unsigned long rcu_flags;
>
> struct perf_raw_record raw = {
> .frag = {
> @@ -8961,6 +8962,8 @@ void perf_tp_event(u16 event_type, u64 c
> perf_sample_data_init(&data, 0, 0);
> data.raw = &raw;
>
> + rcu_flags = trace_rcu_enter();
> +
> perf_trace_buf_update(record, event_type);
>
> hlist_for_each_entry_rcu(event, head, hlist_entry) {
> @@ -8996,6 +8999,8 @@ void perf_tp_event(u16 event_type, u64 c
> }
>
> perf_swevent_put_recursion_context(rctx);
> +
> + trace_rcu_exit(rcu_flags);
> }
> EXPORT_SYMBOL_GPL(perf_tp_event);
>
>
next prev parent reply other threads:[~2020-02-12 14:26 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 9:32 [PATCH 0/8] tracing vs rcu vs nmi Peter Zijlstra
2020-02-12 9:32 ` [PATCH 1/8] rcu: Rename rcu_irq_{enter,exit}_irqson() Peter Zijlstra
2020-02-12 9:32 ` [PATCH 2/8] rcu: Mark rcu_dynticks_curr_cpu_in_eqs() inline Peter Zijlstra
2020-02-12 9:32 ` [PATCH 3/8] rcu,tracing: Create trace_rcu_{enter,exit}() Peter Zijlstra
2020-02-12 9:32 ` [PATCH 4/8] sched,rcu,tracing: Mark preempt_count_{add,sub}() notrace Peter Zijlstra
2020-02-12 14:24 ` Steven Rostedt
2020-02-12 15:02 ` Peter Zijlstra
2020-02-12 15:14 ` Steven Rostedt
2020-02-12 15:38 ` Peter Zijlstra
2020-02-12 9:32 ` [PATCH 5/8] x86,tracing: Mark debug_stack_{set_zero,reset)() notrace Peter Zijlstra
2020-02-12 14:25 ` Steven Rostedt
2020-02-12 15:04 ` Peter Zijlstra
2020-02-12 15:18 ` Steven Rostedt
2020-02-12 15:39 ` Peter Zijlstra
2020-02-12 9:32 ` [PATCH 6/8] perf,tracing: Prepare the perf-trace interface for RCU changes Peter Zijlstra
2020-02-12 14:26 ` Steven Rostedt [this message]
2020-02-12 15:07 ` Mathieu Desnoyers
2020-02-12 9:32 ` [PATCH 7/8] tracing: Employ trace_rcu_{enter,exit}() Peter Zijlstra
2020-02-12 9:32 ` [PATCH 8/8] tracing: Remove regular RCU context for _rcuidle tracepoints (again) Peter Zijlstra
2020-02-12 14:29 ` Steven Rostedt
2020-02-12 15:12 ` Peter Zijlstra
2020-02-12 10:01 ` [PATCH 0/8] tracing vs rcu vs nmi Peter Zijlstra
2020-02-12 10:56 ` Will Deacon
2020-02-12 11:58 ` Peter Zijlstra
2020-02-12 14:32 ` Steven Rostedt
2020-02-12 15:21 ` Peter Zijlstra
2020-02-12 10:03 ` Peter Zijlstra
2020-02-12 10:07 ` Peter Zijlstra
2020-02-12 10:09 ` Peter Zijlstra
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