linux-kernel - [RFC PATCH 3/5] tracing: Add method for recording "func

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Message-Id: <20210304090141.207309-4-y.karadz@gmail.com>
Date:   Thu,  4 Mar 2021 11:01:39 +0200
From:   "Yordan Karadzhov (VMware)" <y.karadz@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        "Yordan Karadzhov (VMware)" <y.karadz@...il.com>
Subject: [RFC PATCH 3/5] tracing: Add method for recording "func_repeats" events

This patch only provides the implementation of the method.
Later we will used it in a combination with a new option for
function tracing.

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@...il.com>
---
 kernel/trace/trace.c | 21 +++++++++++++++++++++
 kernel/trace/trace.h |  4 ++++
 2 files changed, 25 insertions(+)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 5f5fa08c0644..5c62fda666af 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3109,6 +3109,27 @@ static void ftrace_trace_userstack(struct trace_array *tr,
 
 #endif /* CONFIG_STACKTRACE */
 
+void trace_last_func_repeats(struct trace_array *tr,
+			     struct trace_func_repeats *last_info,
+			     unsigned int trace_ctx)
+{
+	struct trace_buffer *buffer = tr->array_buffer.buffer;
+	struct func_repeats_entry *entry;
+	struct ring_buffer_event *event;
+
+	event = __trace_buffer_lock_reserve(buffer, TRACE_FUNC_REPEATS,
+					    sizeof(*entry), trace_ctx);
+	if (!event)
+		return;
+
+	entry = ring_buffer_event_data(event);
+	entry->ip = last_info->ip;
+	entry->pip = last_info->parent_ip;
+	entry->count = last_info->count;
+
+	__buffer_unlock_commit(buffer, event);
+}
+
 /* created for use with alloc_percpu */
 struct trace_buffer_struct {
 	int nesting;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 09bf12c038f4..0ef823bb9594 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -696,6 +696,10 @@ static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
 }
 #endif /* CONFIG_STACKTRACE */
 
+void trace_last_func_repeats(struct trace_array *tr,
+			     struct trace_func_repeats *last_info,
+			     unsigned int trace_ctx);
+
 extern u64 ftrace_now(int cpu);
 
 extern void trace_find_cmdline(int pid, char comm[]);
-- 
2.25.1