答复: oprofile-list Digest, Vol 108, Issue 1

"蒋雄伟(蒋冲)" <[email protected]>
Newsgroups gmane.linux.oprofile,gmane.comp.emulators.xen.devel
Message-ID <[email protected]> 
In /xen/arch/x86/oprofile/op_counter.h  there is a definition

#define OP_MAX_COUNTER 8

As far as I know , the number of counter equals the number of events.  As
all we know that the number of events is more than 8. 
So my question is : Is it the maximum concurrent counter or the total
counter ? 

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发送时间: 2015年5月5日 10:50
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主题: oprofile-list Digest, Vol 108, Issue 1

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Today's Topics:

   1. Re: Does oprofile suffer from aliasing? (William Cohen)
   2. Perf event setup failed (Mike Accola)
   3. Re: Perf event setup failed (Michael Petlan)
   4. Error cross compiling oprofile (Paul Fine)


----------------------------------------------------------------------

Message: 1
Date: Thu, 30 Apr 2015 14:18:19 -0400
From: William Cohen <[email protected]>
Subject: Re: Does oprofile suffer from aliasing?
To: Grant Edwards <[email protected]>,
	[email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset=windows-1252

On 04/30/2015 12:43 PM, Grant Edwards wrote:
> On 2015-04-30, William Cohen <[email protected]> wrote:
>>
>>> AFAICT the ARM926 core doesn't have a PMU at all -- I can find no 
>>> mention of one in either ARM docs for the ARM926 or Atmel docs for 
>>> the
>>> at91 parts.
> [...]
>>> Is there such a thing as software-only PMU support?
> 
>> The perf command included with newer kernels (since 2.6.31) allow 
>> recording both performance monitoring hardware events and software 
>> events.
> 
> So that would be a sort of software-only PMU support (from the user's 
> POV)?

Hi Grant,

Yes, in theory perf should provide software-only events if no pmu is
available. I have seen that happen on trimslice when the device tree didn't
describe performance monitoring hardware.  However, using perf depends on
having a newer kernel that works on the particular device.  In the past I
have encountered arm devices that only worked with particular kernels with
various patches (for example genesi efika smartbook).  I hope that you have
a reasonable new kernel that works on the arm926.

> 
>> Assuming that perf is working you should be able to do following to 
>> see what events it supports:
>>
>> # perf list
> [...]
>> # perf record --freq 1000 -e cpu-clock -a sleep 10
> [...]
>> # perf report
> 
> OK, thanks.  It's probably time to try to get a newer kernel running. 
> IIRC, Atmel provides kernel config examples for a few different 
> versions up to 3.6 for my platform.
> 
> So, let's say I have a hardware interrupt I can hook stuff to (I do), 
> and I can generate "random enough" edges on the pin in question with a 
> predictable frequency distribution (that might take a bit of 
> soldering, but shouldn't be too difficult).
> 
> Can I stick something in the ISR for that interrupt that will cause a 
> "sample"?
> 

You could do something like that with the "perf probe" described on:

https://lwn.net/Articles/355456/
http://www.brendangregg.com/perf.html

It looks like you would need to have a script to do process to group things
by the argument.

-Will




------------------------------

Message: 2
Date: Mon, 4 May 2015 09:56:50 -0500
From: Mike Accola <[email protected]>
Subject: Perf event setup failed
To: [email protected]
Message-ID:
	
<OFE1EF3D3A.4EEEBF45-ON86257E3B.0051E486-86257E3B.00521D5C@us.ibm.com>
Content-Type: text/plain; charset="us-ascii"

I was trying to use operf using the
br_misp_retired:400009:all_branches_pebs event on a machine with Haswell
processor.

I can run count with this event to get counters just fine.

However, when I try to use it with operf, I get this error:

operf -c -e br_misp_retired:400009:all_branches_pebs -d outdir -s
perf_event_open failed with Operation not supported Caught runtime_error:
Internal Error.  Perf event setup failed.
Error running profiler

Any ideas why?

I am using a version of operf 1.0.0 that we compile ourselves.

Thanks.



Mike Accola
IBM InfoSphere Streams
IBM Analytics

Phone: 720-349-3409
E-mail: [email protected]



 
 
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Message: 3
Date: Mon, 04 May 2015 18:46:06 +0200
From: Michael Petlan <[email protected]>
Subject: Re: Perf event setup failed
To: Mike Accola <[email protected]>
Cc: [email protected]
Message-ID: <1430757966.5694.16.camel@Rudolf-RHEL-7>
Content-Type: text/plain; charset="UTF-8"

Hi Mike,

could you try the following:

perf stat -e r04c5:pp ./something

and then

perf record -e r04c5:pp ./something
perf report


Could you provide some additional info, like kernel version, which
distro is it and cpuinfo?

Thanks.

Regards,
Michael


On Mon, 2015-05-04 at 09:56 -0500, Mike Accola wrote:
> I was trying to use operf using the
> br_misp_retired:400009:all_branches_pebs event on a machine with
> Haswell processor. 
> 
> I can run count with this event to get counters just fine. 
> 
> However, when I try to use it with operf, I get this error: 
> 
> operf -c -e br_misp_retired:400009:all_branches_pebs -d outdir -s 
> perf_event_open failed with Operation not supported 
> Caught runtime_error: Internal Error.  Perf event setup failed. 
> Error running profiler 
> 
> Any ideas why? 
> 
> I am using a version of operf 1.0.0 that we compile ourselves. 
> 
> Thanks.
> 
> 
> ___________________________________
> Mike Accola 
> IBM InfoSphere Streams 
> IBM Analytics
> 
> Phone: 720-349-3409 
> E-mail: [email protected] 
> 
> 
> 
> 
> 
>   
> 
>   
> 
>
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------------------------------

Message: 4
Date: Mon, 4 May 2015 22:49:36 -0400
From: Paul Fine <[email protected]>
Subject: Error cross compiling oprofile
To: [email protected]
Message-ID:
	<CAC7FuqmEaS5H39HCjGhrBqo=Q_feAwAzThpMWqnxDM+KNnudgw@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi,

I am trying to cross compile oprofile for the ARM on the TI C6A816x
running linux-2.6.37.  The "make" step gave me this error:

Making all in pe_profiling
make[2]: Entering directory
`/home/pfine/oprofile/oprofile-1.0.0/pe_profiling'
arm-none-linux-gnueabi-g++ -DHAVE_CONFIG_H -I. -I..  -I ../libutil -I
../libop -I ../libutil++ -I ../libperf_events -I ../libpe_utils
-I/home/pfine/oprofile/linux_hdr_install/include   -W -Wall -fno-common
-ftemplate-depth-50 -g -O2 -MT operf.o -MD -MP -MF .deps/operf.Tpo -c -o
operf.o operf.cpp
operf.cpp: In function 'int start_profiling()':
operf.cpp:330: error: 'pipe2' was not declared in this scope
make[2]: *** [operf.o] Error 1


I can't find the pipe2() function call in the kernel headers.  Any idea
what I am missing?

Thanks
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----------------------------------------------------------------------------
--
One dashboard for servers and applications across Physical-Virtual-Cloud 
Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
http://ad.doubleclick.net/ddm/clk/290420510;117567292;y

------------------------------

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End of oprofile-list Digest, Vol 108, Issue 1
*********************************************


------------------------------------------------------------------------------
One dashboard for servers and applications across Physical-Virtual-Cloud 
Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
http://ad.doubleclick.net/ddm/clk/290420510;117567292;y
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