From: Igor Zhbanov <i.zhbanov at samsung.com>
To: powertop@lists.01.org
Subject: Re: [Powertop] Query: Weird Output values: Percentage over 100%
Date: Tue, 04 Sep 2012 11:30:50 +0400 [thread overview]
Message-ID: <5045AE2A.7000302@samsung.com> (raw)
In-Reply-To: 5044F182.8010407@linux.intel.com
[-- Attachment #1: Type: text/plain, Size: 856 bytes --]
Arjan van de Ven wrote:
> shouldn't... the buffers are quite large....
By the way, I just curious, why events processing are limited to 5000?
I mean the PowerTOP has f half-megabyte buffer for each type of events
but wishes to process only 5000 even if data is there?
void perf_event::process(void *cookie)
{
...
while (pc->data_tail != pc->data_head && i++ < 5000) {
...
In the case of many cores sched:switch will be fired at least CONFIG_HZ * nr_cpus
times per second (as I understand), and that could easily be larger than 5000.
Especially when we measuring for several seconds.
--
Best regards,
Igor Zhbanov,
Expert Software Engineer,
phone: +7 (495) 797 25 00 ext 3806
e-mail: i.zhbanov(a)samsung.com
ASWG, Moscow R&D center, Samsung Electronics
12 Dvintsev street, building 1
127018, Moscow, Russian Federation
next reply other threads:[~2012-09-04 7:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 7:30 Igor Zhbanov [this message]
-- strict thread matches above, loose matches on Subject: below --
2012-09-04 12:37 [Powertop] Query: Weird Output values: Percentage over 100% Sergey Senozhatsky
2012-09-03 18:05 Arjan van de Ven
2012-09-03 17:57 Sergey Senozhatsky
2012-09-03 17:37 Arjan van de Ven
2012-09-03 17:20 Sergey Senozhatsky
2012-09-03 6:54 viresh kumar
2012-08-29 8:09 viresh kumar
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