linux-kernel - Re: [patch] x86, perf_counter, bts: add bts to perf

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Message-ID: <20090807111949.GA30014@elte.hu>
Date:	Fri, 7 Aug 2009 13:19:49 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Metzger, Markus T" <markus.t.metzger@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [patch] x86, perf_counter, bts: add bts to perf_counter


note, i had this running in the background, as root:

/home/mingo/bin/perf top >/dev/null 2>/dev/null&

that is what interacted most likely. I killed that task and did a 
user-space only recording via:

titan:~> perf record -f -e branches:u -c 1 ./loop_1b_instructions

and that succeeded:

^C[ perf record: Captured and wrote 827.901 MB perf.data (~36171547 samples) ]

to make BTS sampling really practical we need a 'flight data 
recorder' mode for the mmap buffer (overwrite mode), right? Peter 
sent you a patch for that some time ago - did anything good happen 
to that patch?

	Ingo
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