linux-kernel - [tip:tracing/urgent] tracing: Fix missing function_graph events when we splice_read from trace

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Message-ID: <tip-74e7ff8c50b6b022e6ffaa736b16a4dc161d3eaf@git.kernel.org>
Date:	Tue, 4 Aug 2009 12:12:50 GMT
From:	tip-bot for Lai Jiangshan <laijs@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	fweisbec@...il.com, rostedt@...dmis.org, tglx@...utronix.de,
	laijs@...fujitsu.com
Subject: [tip:tracing/urgent] tracing: Fix missing function_graph events when we splice_read from trace_pipe

Commit-ID:  74e7ff8c50b6b022e6ffaa736b16a4dc161d3eaf
Gitweb:     http://git.kernel.org/tip/74e7ff8c50b6b022e6ffaa736b16a4dc161d3eaf
Author:     Lai Jiangshan <laijs@...fujitsu.com>
AuthorDate: Tue, 28 Jul 2009 20:17:22 +0800
Committer:  Frederic Weisbecker <fweisbec@...il.com>
CommitDate: Tue, 28 Jul 2009 23:17:23 +0200

tracing: Fix missing function_graph events when we splice_read from trace_pipe

About a half events are missing when we splice_read
from trace_pipe. They are unexpectedly consumed because we ignore
the TRACE_TYPE_NO_CONSUME return value used by the function graph
tracer when it needs to consume the events by itself to walk on
the ring buffer.

The same problem appears with ftrace_dump()

Example of an output before this patch:

1)               |      ktime_get_real() {
1)   2.846 us    |          read_hpet();
1)   4.558 us    |        }
1)   6.195 us    |      }

After this patch:

0)               |      ktime_get_real() {
0)               |        getnstimeofday() {
0)   1.960 us    |          read_hpet();
0)   3.597 us    |        }
0)   5.196 us    |      }

The fix also applies on 2.6.30

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: stable@...nel.org
LKML-Reference: <4A6EEC52.90704@...fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>


---
 kernel/trace/trace.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8bc8d8a..da984ad 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3085,7 +3085,8 @@ tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter)
 			break;
 		}
 
-		trace_consume(iter);
+		if (ret != TRACE_TYPE_NO_CONSUME)
+			trace_consume(iter);
 		rem -= count;
 		if (!find_next_entry_inc(iter))	{
 			rem = 0;
@@ -4233,8 +4234,11 @@ static void __ftrace_dump(bool disable_tracing)
 		iter.pos = -1;
 
 		if (find_next_entry_inc(&iter) != NULL) {
-			print_trace_line(&iter);
-			trace_consume(&iter);
+			int ret;
+
+			ret = print_trace_line(&iter);
+			if (ret != TRACE_TYPE_NO_CONSUME)
+				trace_consume(&iter);
 		}
 
 		trace_printk_seq(&iter.seq);
--
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