linux-kernel - Re: trinity finds ftrace/perf bug. Film at 11.

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Message-ID: <20130913141638.GA6799@redhat.com>
Date:	Fri, 13 Sep 2013 10:16:38 -0400
From:	Dave Jones <davej@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: trinity finds ftrace/perf bug. Film at 11.

On Fri, Sep 13, 2013 at 12:56:37PM +0200, Peter Zijlstra wrote:
 > On Thu, Sep 12, 2013 at 02:19:13PM -0400, Steven Rostedt wrote:
 > 
 > > > The good news is I can reproduce that very quickly.
 > > > (Apply http://paste.fedoraproject.org/38721/37890755 on top of trinity.git,
 > > >  and run ./trinity -l off -q -C32 -c inotify_init1 -c perf_event_open -c newlstat)
 > 
 > " The paste you are looking for does not exist "
 
bah. that sucks. appended below.

 > And that line on its own doesn't seem to do much.. its been running for
 > minutes now.
 > 
 > Or does 'quickly' mean something else?

without the diff, it'll use all kinds of fds. this diff hardwires it to just use
fd's from perf_event_open.  I'll hack up a command line switch to do this in a better
way at some point.

	Dave


diff --git a/fds.c b/fds.c
index cc1ca6d..f48c95e 100644
--- a/fds.c
+++ b/fds.c
@@ -119,6 +119,8 @@ static int get_new_random_fd(void)
 retry:
 	i = rand() % 6;
 
+	i = 3;
+
 	if (do_specific_proto == TRUE)
 		i = 1;
 
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