linux-kernel - [PATCH] ftrace: add tracing

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Date:	Mon, 22 Jun 2015 16:58:08 +0530
From:	Umesh Tiwari <umesh.t@...sung.com>
To:	rostedt@...dmis.org, mingo@...hat.com, linux-kernel@...r.kernel.org
Cc:	gupta.namit@...sung.com, pankaj.m@...sung.com,
	Himanshu Maithani <himanshu.m@...sung.com>,
	Umesh Tiwari <umesh.t@...sung.com>
Subject: [PATCH] ftrace: add tracing_thresh to function profile

From: Himanshu Maithani <himanshu.m@...sung.com>

This patch extends tracing_thresh functionality to function profile tracer.
If tracing_thresh is set, print those entries only,
whose average is > tracing thresh.

Signed-off-by: Umesh Tiwari <umesh.t@...sung.com>
---
 kernel/trace/ftrace.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4f22802..7a48a67 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -600,13 +600,19 @@ static int function_stat_show(struct seq_file *m, void *v)
 		goto out;
 	}
 
+	/* moved above to avoid printing values < thresh */
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+	avg = rec->time;
+	do_div(avg, rec->counter);
+	if (tracing_thresh && (avg < tracing_thresh))
+		goto out;
+#endif
+
 	kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
 	seq_printf(m, "  %-30.30s  %10lu", str, rec->counter);
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 	seq_puts(m, "    ");
-	avg = rec->time;
-	do_div(avg, rec->counter);
 
 	/* Sample standard deviation (s^2) */
 	if (rec->counter <= 1)
-- 
1.7.9.5

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