From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: Stephane Eranian <eranian@google.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Linux PPC dev <linuxppc-dev@ozlabs.org>,
ellerman@au1.ibm.com, michael.neuling@au1.ibm.com
Subject: Re: [PATCH V2 0/6] perf: New conditional branch filter
Date: Mon, 02 Sep 2013 09:07:36 +0530 [thread overview]
Message-ID: <52240800.6060002@linux.vnet.ibm.com> (raw)
In-Reply-To: <CABPqkBS2AD873tHnyCHeC7uwsJdP1V6=8WGUTHG+R0z2pphHjQ@mail.gmail.com>
On 08/30/2013 05:18 PM, Stephane Eranian wrote:
> 2013/8/30 Anshuman Khandual <khandual@linux.vnet.ibm.com>
>> >
>> > This patchset is the re-spin of the original branch stack sampling
>> > patchset which introduced new PERF_SAMPLE_BRANCH_COND filter. This patchset
>> > also enables SW based branch filtering support for PPC64 platforms which have
>> > branch stack sampling support. With this new enablement, the branch filter support
>> > for PPC64 platforms have been extended to include all these combinations discussed
>> > below with a sample test application program.
>> >
>> >
> I am trying to understand which HW has support for capturing the
> branches: PPC7 or PPC8.
> Then it seems you're saying that only PPC8 has the filtering support.
> On PPC7 you use the
> SW filter. Did I get this right?
>
> I will look at the patch set.
>
Hey Stephane,
POWER7 does not have BHRB support required to capture the branches. Right
now its only POWER8 (which has BHRB) can capture branches in HW. It has some
PMU level branch filters and rest we have implemented in SW. But these SW
filters cannot be applied in POWER7 as it does not support branch stack
sampling because of lack of BHRB. I have mentioned PPC64 support in the
sense that this SW filtering code could be used in existing or future generation
powerpc processors which would have PMU support for branch stack sampling. My
apologies if the description for the patchset was ambiguous.
Regards
Anshuman
next prev parent reply other threads:[~2013-09-02 3:38 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-30 4:24 [PATCH V2 0/6] perf: New conditional branch filter Anshuman Khandual
2013-08-30 4:24 ` [PATCH V2 1/6] perf: New conditional branch filter criteria in branch stack sampling Anshuman Khandual
2013-08-30 4:24 ` [PATCH V2 2/6] powerpc, perf: Enable conditional branch filter for POWER8 Anshuman Khandual
2013-08-30 4:24 ` [PATCH V2 3/6] perf, tool: Conditional branch filter 'cond' added to perf record Anshuman Khandual
2013-08-30 4:24 ` [PATCH V2 4/6] x86, perf: Add conditional branch filtering support Anshuman Khandual
2013-08-30 4:24 ` [PATCH V2 5/6] perf, documentation: Description for conditional branch filter Anshuman Khandual
2013-08-30 4:24 ` [PATCH V2 6/6] powerpc, perf: Enable SW filtering in branch stack sampling framework Anshuman Khandual
2013-08-30 11:48 ` [PATCH V2 0/6] perf: New conditional branch filter Stephane Eranian
2013-09-02 3:37 ` Anshuman Khandual [this message]
2013-09-21 6:41 ` Anshuman Khandual
2013-09-21 6:45 ` Anshuman Khandual
2013-09-10 2:06 ` Michael Ellerman
2013-09-10 3:52 ` Anshuman Khandual
2013-09-21 6:55 ` Stephane Eranian
2013-09-23 9:15 ` Anshuman Khandual
2013-09-25 2:19 ` Michael Ellerman
2013-09-25 6:15 ` Anshuman Khandual
2013-09-26 11:14 ` Stephane Eranian
2013-10-10 5:04 ` Anshuman Khandual
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