linux-kernel - [BUG] perf top shows no data

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Message-Id: <1255532530.7113.4570.camel@gandalf.stny.rr.com>
Date:	Wed, 14 Oct 2009 11:02:10 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: [BUG] perf top shows no data

Hi Ingo,

I have a box where "perf top" shows no data. I get the header, but it
never shows anything. I bisected it down to this commit.

42e59d7d19dc4b49feab2a860fd9a8ca3248c833
perf tools: Default to 1 KHz auto-sampling freq events

Which, besides the whitespace clean ups is simply:

-static int                     freq                            =  0;
+static int                     freq                            =   1000; /* 1 KHz */

Which, BTW, whitespace clean ups would have been nicer in a separate
patch. It was a bit of a PITA to find what actually changed.

Peter tells me that the freq stuff is a bit fragile. Note, latest pref
top works on other boxes. Just not this one.

-- Steve

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