From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: Michael Neuling <mikey@neuling.org>
Cc: Linux PPC dev <linuxppc-dev@ozlabs.org>,
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
Paul Mackerras <paulus@samba.org>,
Anton Blanchard <anton@samba.org>
Subject: Re: [PATCH 1/2] powerpc/perf: Fix finding overflowed PMC in interrupt
Date: Tue, 06 Nov 2012 16:12:47 +0530 [thread overview]
Message-ID: <5098E9A7.9060200@linux.vnet.ibm.com> (raw)
In-Reply-To: <21513.1352197182@neuling.org>
On 11/06/2012 03:49 PM, Michael Neuling wrote:
>>
>>
>> I have couple of questions.
>>
>> Can the buggy overflow happen on any of the available counters PMC1-PMC4 ?
>
> No. It's limited to certain events and I believe it can only happen on
> PMC2 and 4. This code doesn't bother trying to make this distinction
> though.
>
>> Will this approach never reset an actual user defined event (with
>> sample period < 256) ? Is this related to the counter or the event
>> which it is counting ? Just wondering if we have to do something more
>> than checking for the count < 256. Just a thought.
>
>
> I don't understand what you mean by these questions. Can you explain a
> bit more?
>
Thats fine. The previous answer explains it well. Thanks !
next prev parent reply other threads:[~2012-11-06 10:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-08 1:07 [PATCH] Use pmc_overflow() to detect rolled back events Sukadev Bhattiprolu
2012-09-21 0:38 ` Sukadev Bhattiprolu
2012-11-06 1:08 ` [PATCH 1/2] powerpc/perf: Fix finding overflowed PMC in interrupt Michael Neuling
2012-11-06 1:08 ` [PATCH 2/2] powerpc/perf: Fix for PMCs not making progress Michael Neuling
2012-11-06 1:25 ` [PATCH 1/2] powerpc/perf: Fix finding overflowed PMC in interrupt Anton Blanchard
2012-11-06 1:53 ` Michael Neuling
2012-11-06 1:53 ` Michael Neuling
2012-11-06 6:47 ` Anshuman Khandual
2012-11-06 10:19 ` Michael Neuling
2012-11-06 10:42 ` Anshuman Khandual [this message]
2012-12-22 1:07 ` Sukadev Bhattiprolu
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