linux-kernel - Re: ftrace does not work on cpus

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Date:	Sat, 16 Oct 2010 16:45:33 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Robin Holt <holt@....com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: ftrace does not work on cpus > 999.

On Sat, Oct 16, 2010 at 08:15:05AM -0500, Robin Holt wrote:
> Just started looking into using ftrace to identify a difficult to diagnose
> userland set of processes when I noticed that the .../trace/per_cpu
> directory only contains entries for cpus 0-999.  I have not looked at
> what else may not work.  For the cpus that are listed, I am able to grep
> trace buffer information so it is mostly working.
> 
> I will be away from email for most of today, but may get back to this
> tonight.  If there are any suggestions, I will happily give them a try.
> 
> Thanks,
> Robin


Oh!

Can you please try that?

Thanks.


diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 9ec59f5..3565f9e 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3999,7 +3999,7 @@ static void tracing_init_debugfs_percpu(long cpu)
 	/* strlen(cpu) + MAX(log10(cpu)) + '\0' */
 	char cpu_dir[7];
 
-	if (cpu > 999 || cpu < 0)
+	if (cpu < 0)
 		return;
 
 	sprintf(cpu_dir, "cpu%ld", cpu);


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