linux-kernel - [PATCH v2 1/3] kernel : process fork/exit: export symbol for fork/exit tracing functions

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Message-ID: <20230614032038.11699-2-Wei-chin.Tsai@mediatek.com>
Date:   Wed, 14 Jun 2023 11:20:33 +0800
From:   Wei Chin Tsai <Wei-chin.Tsai@...iatek.com>
To:     <linux-kernel@...r.kernel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     <wsd_upstream@...iatek.com>, <wei-chin.tsai@...iatek.com>,
        <mel.lee@...iatek.com>, <ivan.tseng@...iatek.com>,
        Wei Chin Tsai <Wei-chin.Tsai@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH v2 1/3] kernel : process fork/exit: export symbol for fork/exit tracing functions

In ths Patch, we export symbols for two functions of
"sched_process_fork" and "sched_process_exit" for
process statistics. During the system running,
some process will run in a second and then terminate.
We hope that we can capture those processes' jiffies
information for system performance analysis.

Signed-off-by: Wei Chin Tsai <Wei-chin.Tsai@...iatek.com>
---
 kernel/exit.c | 2 ++
 kernel/fork.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/kernel/exit.c b/kernel/exit.c
index edb50b4c9972..410a3de14e09 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -81,6 +81,8 @@
  */
 static unsigned int oops_limit = 10000;
 
+EXPORT_TRACEPOINT_SYMBOL_GPL(sched_process_exit);
+
 #ifdef CONFIG_SYSCTL
 static struct ctl_table kern_exit_table[] = {
 	{
diff --git a/kernel/fork.c b/kernel/fork.c
index f81985dcc4bd..8fba356fb7c2 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -142,6 +142,8 @@ DEFINE_PER_CPU(unsigned long, process_counts) = 0;
 
 __cacheline_aligned DEFINE_RWLOCK(tasklist_lock);  /* outer */
 
+EXPORT_TRACEPOINT_SYMBOL_GPL(sched_process_fork);
+
 #ifdef CONFIG_PROVE_RCU
 int lockdep_tasklist_lock_is_held(void)
 {
-- 
2.18.0