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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20090807112634.GC30014@elte.hu \
--to=mingo@elte.hu \
--cc=a.p.zijlstra@chello.nl \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=markus.t.metzger@gmail.com \
--cc=markus.t.metzger@intel.com \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.