Re: PM_L1MISS_LAT_EXC_xxx events

On 11/19/2014 08:25 AM, Henry May wrote:
> 
> 
> Henry May
> IBM InfoSphere Streams Performance
> [email protected]
> 720-342-8873
> Tie: 963-8873
> 
> 
> William Cohen <[email protected]> wrote on 11/18/2014 09:15:24 PM:
> 
>> From: William Cohen <[email protected]>
>> To: Henry May/Rochester/IBM@IBMUS, [email protected]
>> Date: 11/18/2014 09:15 PM
>> Subject: Re: PM_L1MISS_LAT_EXC_xxx events
>>
>> On 11/18/2014 08:47 PM, Henry May wrote:
>> > I have RHEL7 on a P8 and am unable to collect any of the
>> PM_L1MISS_LAT_EXC_xxx events with ocount.  Any suggestions?
>> >
>> > [root@pftul3 ~]# /opt/at7.0/bin/ocount -s -c -b -e PM_L1MISS_LAT_EXC_32
>> > perf_event_open failed with Invalid argument
>> > Caught runtime error while setting up counters
>> > Internal Error.  Perf event setup failed.
>> > Error running ocount
>> >
>> > Henry May
>> > IBM InfoSphere Streams Performance
>> > [email protected]
>> > 720-342-8873
>> > Tie: 963-8873
>> >
>> >
>>
>> Hi Henry,
>>
>> It would be helpful to include the oprofile version that you have
>> the problem with.  If you are using the oprofile-0.9.9-4.el7, then
>> it is likely because the updated power8 events were added after
>> oprofile-0.9.9 was created and the power8 event patch wasn't yet
>> available.  There is a patch for the upcoming rhel-7.1 version of
>> oprofile that includes the following patch:
>>
>>  
>> commit 3795ee4a10c11e16c8d13b5a5d7a6f10615a40d5
>> Author: Maynard Johnson <[email protected]>
>> Date:   Wed Sep 25 11:15:30 2013 -0500
>>
>>     Add two new POWER8 events that are needed for stall analysis
>>    
>>     Signed-off-by: Maynard Johnson <[email protected]>
>>
>>
>> -Will
>>
> Thanks for the response, Will.  I have 1.0.0
> [root@pftul3 ~]# /opt/at7.0/bin/ophelp -v
> /opt/at7.0/bin/ophelp: oprofile 1.0.0git compiled on Jul 24 2014 13:48:26
> It appears this build predates the addition of the above events.  This was a pre-built package.  I've subsequently downloaded the source with
> git clone git://git.code.sf.net/p/oprofile/oprofile
> and I'm still getting the same error.
> [root@pftul3 oprofile]# /usr/local/bin/ocount -s -c -b -e PM_L1MISS_LAT_EXC_32
> perf_event_open failed with Invalid argument
> Caught runtime error while setting up counters
> Internal Error.  Perf event setup failed.
> Error running ocount
Hi, Henry,
This is an oprofile bug. Investigating this, I've found that these PM_L1MISS_LAT_EXC_* events, along with the PM_RC_LIFETIME_EXC_* events, have event codes larger than the size of an integer.  These events require threshold settings which are encoded into the next 16 bits above the 32-bit integer. And unfortunately, oprofile has always assumed event codes would be no larger than an int, so we have some legacy code (mostly in libop) that needs to be fixed.  I'll post a patch when I have it ready.

-Maynard
> [root@pftul3 oprofile]# /usr/local/bin/ocount -v
> /usr/local/bin/ocount: oprofile 1.1.0git compiled on Nov 19 2014 08:15:47
> 
> 
> One additional question:  There are actually 4 events, and the reference only mentions two.  Can you reconcile that?
> 
> 
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