[for-next][PATCH 10/14] ftrace: add tracing_thresh to function profile

From: Steven Rostedt
Date: Sat Aug 29 2015 - 11:05:14 EST


From: Umesh Tiwari <umesh.t@xxxxxxxxxxx>

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

Link: http://lkml.kernel.org/r/1434972488-8571-1-git-send-email-umesh.t@xxxxxxxxxxx

Signed-off-by: Umesh Tiwari <umesh.t@xxxxxxxxxxx>
[ Removed unnecessary 'moved' comment ]
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
kernel/trace/ftrace.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 02bece4a99ea..f46dbb5cdf76 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -613,13 +613,18 @@ static int function_stat_show(struct seq_file *m, void *v)
goto out;
}

+#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)
--
2.4.6


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