linux-kernel - [tip:sched/core] sched/debug: Export the newly added tracepoints

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Message-ID: <tip-a056a5bed7fa67706574b00cf1122c38596b2be1@git.kernel.org>
Date:   Tue, 25 Jun 2019 01:28:35 -0700
From:   tip-bot for Qais Yousef <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     u.kleine-koenig@...gutronix.de, bigeasy@...utronix.de,
        peterz@...radead.org, pkondeti@...eaurora.org,
        quentin.perret@....com, torvalds@...ux-foundation.org,
        tglx@...utronix.de, hpa@...or.com, dietmar.eggemann@....com,
        rostedt@...dmis.org, mingo@...nel.org, qais.yousef@....com,
        linux-kernel@...r.kernel.org
Subject: [tip:sched/core] sched/debug: Export the newly added tracepoints

Commit-ID:  a056a5bed7fa67706574b00cf1122c38596b2be1
Gitweb:     https://git.kernel.org/tip/a056a5bed7fa67706574b00cf1122c38596b2be1
Author:     Qais Yousef <qais.yousef@....com>
AuthorDate: Tue, 4 Jun 2019 12:14:59 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 24 Jun 2019 19:23:43 +0200

sched/debug: Export the newly added tracepoints

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@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Pavankumar Kondeti <pkondeti@...eaurora.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Quentin Perret <quentin.perret@....com>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Uwe Kleine-Konig <u.kleine-koenig@...gutronix.de>
Link: https://lkml.kernel.org/r/20190604111459.2862-7-qais.yousef@arm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 83bd6bb32a34..e5e02d23e693 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)