linux-kernel - [PATCH][GIT PULL][v3.4] tracing: Fix stacktrace of latency tracers (irqsoff and friends)

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Date:	Thu, 19 Apr 2012 17:06:54 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	stable <stable@...r.kernel.org>
Subject: [PATCH][GIT PULL][v3.4] tracing: Fix stacktrace of latency tracers
 (irqsoff and friends)


Ingo,

Found another stacktrace bug. This is on top of the last pull request I
made.

-- Steve


Please pull the latest tip/perf/urgent-2 tree, which can be found at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
tip/perf/urgent-2

Head SHA1: db4c75cbebd7e5910cd3bcb6790272fcc3042857


Steven Rostedt (1):
      tracing: Fix stacktrace of latency tracers (irqsoff and friends)

----
 kernel/trace/trace_output.c |    5 +++++
 1 file changed, 5 insertions(+)
---------------------------
commit db4c75cbebd7e5910cd3bcb6790272fcc3042857
Author: Steven Rostedt <srostedt@...hat.com>
Date:   Thu Apr 19 10:31:47 2012 -0400

    tracing: Fix stacktrace of latency tracers (irqsoff and friends)
    
    While debugging a latency with someone on IRC (mirage335) on #linux-rt (OFTC),
    we discovered that the stacktrace output of the latency tracers
    (preemptirqsoff) was empty.
    
    This bug was caused by the creation of the dynamic length stack trace
    again (like commit 12b5da3 "tracing: Fix ent_size in trace output" was).
    
    This bug is caused by the latency tracers requiring the next event
    to determine the time between the current event and the next. But by
    grabbing the next event, the iter->ent_size is set to the next event
    instead of the current one. As the stacktrace event is the last event,
    this makes the ent_size zero and causes nothing to be printed for
    the stack trace. The dynamic stacktrace uses the ent_size to determine
    how much of the stack can be printed. The ent_size of zero means
    no stack.
    
    The simple fix is to save the iter->ent_size before finding the next event.
    
    Note, mirage335 asked to remain anonymous from LKML and git, so I will
    not add the Reported-by and Tested-by tags, even though he did report
    the issue and tested the fix.
    
    Cc: stable@...r.kernel.org # 3.1+
    Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 859fae6..df611a0 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -652,6 +652,8 @@ int trace_print_lat_context(struct trace_iterator *iter)
 {
 	u64 next_ts;
 	int ret;
+	/* trace_find_next_entry will reset ent_size */
+	int ent_size = iter->ent_size;
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *entry = iter->ent,
 			   *next_entry = trace_find_next_entry(iter, NULL,
@@ -660,6 +662,9 @@ int trace_print_lat_context(struct trace_iterator *iter)
 	unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 	unsigned long rel_usecs;
 
+	/* Restore the original ent_size */
+	iter->ent_size = ent_size;
+
 	if (!next_entry)
 		next_ts = iter->ts;
 	rel_usecs = ns2usecs(next_ts - iter->ts);


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