From: Ingo Molnar <mingo@elte.hu>
To: "Metzger, Markus T" <markus.t.metzger@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"hpa@zytor.com" <hpa@zytor.com>,
"markus.t.metzger@gmail.com" <markus.t.metzger@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [patch] x86, perf_counter, bts: add bts to perf_counter
Date: Fri, 7 Aug 2009 13:26:34 +0200 [thread overview]
Message-ID: <20090807112634.GC30014@elte.hu> (raw)
In-Reply-To: <928CFBE8E7CB0040959E56B4EA41A77EC1BFF048@irsmsx504.ger.corp.intel.com>
btw., the number of samples seems to be varying too widely:
titan:~> for ((i=0;i<10;i++)); do perf record -f -e branches:u -c 1 true 2>/dev/null; perf report | head -1; done
# Samples: 28784
# Samples: 24063
# Samples: 22788
# Samples: 30449
# Samples: 15335
# Samples: 30557
# Samples: 24010
# Samples: 23866
# Samples: 24877
# Samples: 24330
compared to the branch-stat itself:
titan:~> perf stat -v --repeat 10 -e branches:u true
[ perf stat: executing run #1 ... ]
[ perf stat: executing run #2 ... ]
[ perf stat: executing run #3 ... ]
[ perf stat: executing run #4 ... ]
[ perf stat: executing run #5 ... ]
[ perf stat: executing run #6 ... ]
[ perf stat: executing run #7 ... ]
[ perf stat: executing run #8 ... ]
[ perf stat: executing run #9 ... ]
[ perf stat: executing run #10 ... ]
Performance counter stats for 'true' (10 runs):
23851 branches ( +- 0.000% )
0.000639653 seconds time elapsed ( +- 2.474% )
do we lose records in the recording?
Ingo
next prev parent reply other threads:[~2009-08-07 11:26 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-21 13:56 [patch] x86, perf_counter, bts: add bts to perf_counter Markus Metzger
2009-08-04 10:24 ` Peter Zijlstra
2009-08-04 11:14 ` Ingo Molnar
2009-08-04 11:35 ` Ingo Molnar
2009-08-05 11:10 ` Metzger, Markus T
2009-08-07 7:29 ` Metzger, Markus T
2009-08-07 8:21 ` Peter Zijlstra
2009-08-07 10:18 ` Metzger, Markus T
2009-08-07 10:29 ` Peter Zijlstra
2009-08-07 12:18 ` Metzger, Markus T
2009-08-07 13:05 ` Peter Zijlstra
2009-08-07 10:31 ` Ingo Molnar
2009-08-07 10:36 ` Ingo Molnar
2009-08-07 10:57 ` Metzger, Markus T
2009-08-07 11:17 ` Metzger, Markus T
2009-08-07 11:24 ` Ingo Molnar
2009-08-07 11:33 ` Ingo Molnar
2009-08-07 17:49 ` [PATCH] perf_counter: Fix a race on perf_counter_ctx Peter Zijlstra
2009-08-08 11:52 ` [tip:perfcounters/core] " tip-bot for Peter Zijlstra
2009-08-08 12:03 ` [PATCH] " Ingo Molnar
2009-08-10 12:33 ` Metzger, Markus T
2009-08-10 12:59 ` Peter Zijlstra
2009-08-10 13:46 ` Ingo Molnar
2009-08-11 6:33 ` Metzger, Markus T
2009-08-11 8:59 ` Metzger, Markus T
2009-08-18 12:49 ` Metzger, Markus T
2009-08-18 12:59 ` Peter Zijlstra
2009-08-18 12:59 ` Peter Zijlstra
2009-08-18 13:20 ` Metzger, Markus T
2009-08-18 13:37 ` Peter Zijlstra
2009-08-18 13:54 ` Metzger, Markus T
2009-08-18 14:00 ` Ingo Molnar
2009-08-18 14:15 ` Metzger, Markus T
2009-08-28 9:56 ` Metzger, Markus T
2009-09-01 11:17 ` [discuss] BTS overflow handling, was: " Metzger, Markus T
2009-09-01 13:00 ` Peter Zijlstra
2009-09-01 13:09 ` Ingo Molnar
2009-09-01 13:32 ` Metzger, Markus T
2009-09-01 13:53 ` Peter Zijlstra
2009-09-01 14:27 ` Metzger, Markus T
2009-09-01 14:35 ` Peter Zijlstra
2009-09-03 14:25 ` Metzger, Markus T
2009-08-18 14:01 ` Peter Zijlstra
2009-08-18 14:19 ` Metzger, Markus T
2009-08-09 11:10 ` [tip:perfcounters/core] " tip-bot for Peter Zijlstra
2009-08-07 11:26 ` Ingo Molnar [this message]
2009-08-07 11:29 ` [patch] x86, perf_counter, bts: add bts to perf_counter Ingo Molnar
2009-08-07 12:14 ` Metzger, Markus T
2009-08-07 11:19 ` Ingo Molnar
2009-08-07 11:34 ` Metzger, Markus T
2009-08-07 11:37 ` Metzger, Markus T
2009-08-04 11:37 ` [tip:perfcounters/urgent] x86, perf_counter, bts: Add BTS support to perfcounters tip-bot for Markus Metzger
2009-08-07 10:10 ` [tip:perfcounters/core] " tip-bot for Markus Metzger
2009-08-08 11:43 ` tip-bot for Markus Metzger
2009-08-08 11:53 ` tip-bot for Markus Metzger
-- strict thread matches above, loose matches on Subject: below --
2009-08-07 7:22 [patch] x86, perf_counter, bts: add bts to perf_counter Markus Metzger
2009-08-07 11:45 ` Peter Zijlstra
2009-08-07 11:51 ` Metzger, Markus T
2009-08-07 11:57 ` Peter Zijlstra
2009-08-07 16:39 ` Peter Zijlstra
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