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From: Qais Yousef <qais.yousef@arm.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org,
	Pavankumar Kondeti <pkondeti@codeaurora.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Uwe Kleine-Konig <u.kleine-koenig@pengutronix.de>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Quentin Perret <quentin.perret@arm.com>,
	Qais Yousef <qais.yousef@arm.com>
Subject: [PATCH v3 6/6] sched: export the newly added tracepoints
Date: Tue,  4 Jun 2019 12:14:59 +0100
Message-ID: <20190604111459.2862-7-qais.yousef@arm.com> (raw)
In-Reply-To: <20190604111459.2862-1-qais.yousef@arm.com>

So that external modules can hook into them and extract the info they
need. Since these new tracepoints have no events associated with them
exporting these tracepoints make them useful for external modules to
perform testing and debugging. There's no other way otherwise to access
them.

BPF doesn't have infrastructure to access these bare tracepoints either.

Signed-off-by: Qais Yousef <qais.yousef@arm.com>
---
 kernel/sched/core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 874c427742a9..bc831d913088 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -23,6 +23,17 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/sched.h>
 
+/*
+ * Export tracepoints that act as a bare tracehook (ie: have no trace event
+ * associated with them) to allow external modules to probe them.
+ */
+EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_cfs_tp);
+EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_rt_tp);
+EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_dl_tp);
+EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_irq_tp);
+EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_se_tp);
+EXPORT_TRACEPOINT_SYMBOL_GPL(sched_overutilized_tp);
+
 DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
 
 #if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_JUMP_LABEL)
-- 
2.17.1


  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-04 11:14 [PATCH v3 0/6] sched: Add new tracepoints required for EAS testing Qais Yousef
2019-06-04 11:14 ` [PATCH v3 1/6] sched: autogroup: Make autogroup_path() always available Qais Yousef
2019-06-25  8:24   ` [tip:sched/core] sched/autogroup: " tip-bot for Qais Yousef
2019-06-04 11:14 ` [PATCH v3 2/6] sched: add a new sched_trace_*() helper functions Qais Yousef
2019-06-25  8:25   ` [tip:sched/core] sched/debug: Add " tip-bot for Qais Yousef
2019-06-04 11:14 ` [PATCH v3 3/6] sched: Add new tracepoints to track pelt at rq level Qais Yousef
2019-06-25  8:26   ` [tip:sched/core] sched/debug: Add new tracepoints to track PELT " tip-bot for Qais Yousef
2019-06-04 11:14 ` [PATCH v3 4/6] sched: Add new tracepoint to track pelt at se level Qais Yousef
2019-06-25  8:27   ` [tip:sched/core] sched/debug: Add new tracepoint to track PELT " tip-bot for Qais Yousef
2019-06-04 11:14 ` [PATCH v3 5/6] sched: Add sched_overutilized tracepoint Qais Yousef
2019-06-17 15:50   ` Peter Zijlstra
2019-06-17 16:31     ` Qais Yousef
2019-06-25  8:27   ` [tip:sched/core] sched/debug: " tip-bot for Qais Yousef
2019-06-04 11:14 ` Qais Yousef [this message]
2019-06-25  8:28   ` [tip:sched/core] sched/debug: Export the newly added tracepoints tip-bot for Qais Yousef
2019-06-05  6:17 ` [PATCH v3 0/6] sched: Add new tracepoints required for EAS testing Christoph Hellwig
2019-06-05  7:22   ` Peter Zijlstra
2019-06-05 22:33   ` Qais Yousef
2019-06-17 12:51 ` Qais Yousef
2019-06-17 15:55   ` Peter Zijlstra
2019-06-17 16:22     ` Qais Yousef

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